DeviceNet Cable System

Planning andInstallation Manual

PUB00027R1 2003
PUB00026R4

Important User Information

Because of the variety of uses for the products described in this publication,
those responsible for the application and use of this control equipment mustsatisfy themselves that all necessary steps have been taken to assure thateach application and use meets all performance and safety requirements,
including any applicable laws, regulations, codes and standards.
The illustrations, charts, sample programs and layout examples shown inthis guide are intended solely for purposes of example. Since there aremany variables and requirements associated with any particular installation,
ODVA does not assume responsibility or liability (to include intellectual
property liability) for actual use based upon the examples shown in thispublication.
Reproduction of the contents of this copyrighted publication, in whole orpart, without written permission of ODVA, is prohibited.
Throughout this manual we use notes to make you aware of safety
considerations:!

ATTENTION: Identifies information about practices or
circumstances that can lead to personal injury or death,property damage or economic loss

Attention statements help you to:• identify a hazard• avoid a hazard• recognize the consequences
Important: Identifies information that is critical for successful application
and understanding of the product.

Preface

Using This ManualWhat’s in This Manual

Use this manual to plan and install a DeviceNet™ cable system. This manual
describes the required components of the cable system and how to plan forand install these required components.

Start

1
Quikstart
and Planning™
a DeviceNet
Cable System

2
Identifying
Components

3
Make cable
Connections

4
Calculate
Power
Requirements

5
Commissioning
Troubleshooting
Diagnostics

CompleteA
Selected
NEC Topics

B
Powering
OutputDevicesP-2

Using This Manual

Who Should Read This
Manual

We assume that you have a fundamental understanding of:• electronics and electrical codes• basic wiring techniques• ac and dc power specifications• load characteristics of the devices attached to the DeviceNet™ network

About the National Electric
Code

Much of the information provided in this manual is representative of thecapability of a DeviceNetTM network and its associated components. The
National Electric Code (NEC), in the United States, and the Canadian Electric
Code (CECode), in Canada, places limitations on configurations and the
maximum allowable power/current that can be provided. Refer to Appendix
A for details.

Important: Be sure that all national and local codes are thoroughly
researched and adhered to during the planning and installationof your DeviceNet™ network.

Common Techniques
Used inThis Manual

The following conventions are used throughout this manual:•

Bulleted lists provide information, not procedural steps.

•

Numbered lists provide sequential steps.

•

Information in bold contained within text identifies menu options,screen names and areas of the screen, such as dialog boxes, statusbars, radio buttons and parameters.

•

Text in this font identifies node addresses and other values assigned todevices.

•

Pictures of keys and/or screens represent the actual keys you press or
the screens you use.

This symbol represents an information tip.

Table Of Contents
Get Started.................................................................................................................. 1–1
What’s in this chapter? ....................................................................................................... 1–1
Set Up a DeviceNetTM Network .......................................................................................... 1–1
Basic DeviceNetTM Network ...................................................................................... 1–2
Understand the Topology ........................................................................................... 1–2
Understand the Media......................................................................................................... 1–2
Understand the Cable Options ................................................................................... 1–2
Determine the Maximum Trunk Length Distance ..................................................... 1–3
Determine the Cumulative Drop Line Length ............................................................. 1–4
About the Direct Connection ...................................................................................... 1–5
Using Connectors ...................................................................................................... 1–5
Terminate the Network .............................................................................................. 1–7
Guidelines for Supplying Power ................................................................................. 1–9
Supplying Power ................................................................................................................. 1–10

Identify Cable System Components ......................................................................... 2–1
Round (Thick, Mid and Thin) Cable Network ...................................................................... 2–1
About Thick Cable...................................................................................................... 2–2
About Mid Cable ......................................................................................................... 2–3
About Thin Cable ....................................................................................................... 2–3
About Flat Cable ........................................................................................................ 2–4
Connecting to the Trunk Line ............................................................................................. 2–4
About the T-Port Tap.................................................................................................. 2–6
About the Multi Port Tap............................................................................................. 2–7
About the Power Tap.................................................................................................. 2–7
About the Multi Port Tap............................................................................................. 2–8
About the Direct Connection. ..................................................................................... 2–8
About the Open-Style Connector ............................................................................... 2–9
About Flat Cable Insulation Displacement Connectors (IDCs) .................................. 2–10
Using Preterminated Cables ................................................................................................ 2–11
About Thick Cable...................................................................................................... 2–11
About Thin Cable ....................................................................................................... 2–11
About Terminators ..................................................................................................... 2–13

Make Cable Connections........................................................................................... 3–1
Preparing Cables ................................................................................................................ 3–1
How to Install Open-Style Connectors ................................................................................ 3–2
How to Install Mini/Micro Sealed Field-Installable Connectors .................................. 3–3
How to Install Power taps and Multi Port Taps with Terminals ........................................... 3–4
How to Install Multi Port Taps with Sealed Connectors.............................................. 3–5
How to Connect Drop Lines ............................................................................................... 3–5
TOC-1

Table Of Contents
Flat Cable Installation Instructions ...................................................................................... 3–6
How to Install a Flat Cable Connector........................................................................ 3–6
End Cap Installation ................................................................................................... 3–10
Installing Auxiliary Power Cable ................................................................................. 3–11
Connecting Power Supplies to Round Media...................................................................... 3–11

Determine Power Requirements ............................................................................... 4–1
Use the Look-Up Method .................................................................................................... 4–1
One Power Supply (End-Connected) ......................................................................... 4–11
One Power Supply (Middle-Connected) .......................................................................... 4–12
NEC/CE Code Current Boost Configuration............................................................... 4–14
Two Power Supplies (End-Connected) in Parallel with No V+ Break ..................... 4–15
Two Power Supplies (Not End- Connected) in Parallel with No V+ Break ................. 4–16
Use the Full-Calculation Method ......................................................................................... 4–18
Using the Equation.............................................................................................................. 4–18
One Power Supply (End-Connected) ......................................................................... 4–20
One Power Supply (Middle-Connected)..................................................................... 4–21

Commissioning Troubleshooting and Diagnostics................................................. 5–1
Network Measurement Tools ............................................................................................. 5–1
Verifying Network Installation.............................................................................................. 5–1
Confirming Media ................................................................................................................ 5–2
Proper Network Maintenance.............................................................................................. 5–4
Common Mode Problems ................................................................................................... 5–4
Bus Errors ........................................................................................................................... 5–5
Bus Traffic Problems........................................................................................................... 5–5
Bus Power Problems........................................................................................................... 5–6
Shield Voltage Problems..................................................................................................... 5–6
Common Faults................................................................................................................... 5–7
Flat Cable Shorts ................................................................................................................ 5–7

Understanding Select NEC Topics ........................................................................... A–1
What’s in This Appendix ..................................................................................................... A–1
Class 1 (CL1) Cable .................................................................................................. A–1
Class 2 (CL 2) Cable .................................................................................................. A–1
Specifying Article 725 Topics .............................................................................................. A–2Round (Thick, Mid & Thin) and Class 2 Flat Media.................................................... A–2
Class 1 Round or Flat Media...................................................................................... A–2

TOC-2

Table Of Contents

Powering Output Devices.......................................................................................... B–1
Wide Available Voltage Range............................................................................................ B–1
Noise or Transient Protection.............................................................................................. B–2

DeviceNet Baseline & Test Report............................................................................ C–1
Baseline and Test Report.................................................................................................... C–1

Index

TOC-3

™

Chapter1

Get Started
What’s in This Chapter?

This chapter introduces the DeviceNetTM cable system and provides a brief
overview of how to set up a DeviceNetTM network efficiently. The steps inthis chapter describe the basic tasks involved in setting up a network.

Set Up a DeviceNet
Network

The following diagram illustrates the steps that you should follow to planand install a DeviceNetTM network. The remainder of this chapter provides
an overview and examples of each step, with references to other sections inthis manual for more details.

1

Understandthe media

refer to page 1-2

the
2 Terminate
networkrefer to page 1-7

1 Understand the media

Refer to page 1-2

2 Terminate the network

Refer to page 1-7

3 Supply power

Refer to page 1-9

4 Ground the network

Refer to page 1-16

5 Use the checklist

Refer to page 1-18

Basic DeviceNet™ Network
This figure shows a basic DeviceNet™ network and calls out its basic components.

3 Supplypowerrefer to page 1-93,44 Groundthe networkTRrefer to page 1-16

the check5 Use
list

Power
Supplytrunk lineTRdrop lines

2

1

refer to page 1-18

2
device or nodeTRterminating resistor

Checklist

5

ODVA 2002

1-2

Get Started

Understand the Topology
The DeviceNet cable system uses a trunk/drop line topology.

1 Understand the
med iaTR

TR

You must terminate the trunk line at bothends with 121 Ohms, 1%, 1/4W terminating resistors.
trunk line
drop line
device or node
TR = terminating resistor

Use only DeviceNet™ media that meetor exceed ODVA specifications.

Understand the Cable Options
You can connect components using five cable options:

Wir e
Color

Wir e
Identity

Usage
Round

Usage
Flat

white

CAN_H

signalsignal

blue

CAN_L

signalsignal

bare

drain

shield

n/a

black

V-

power

power

red

V+

power

power

ODVA 2002

Use this cableFor

Round (thick)

The trunk line on the DeviceNetTM
network with a nominal outside
diameter of 12.2 mm(0.48 in.). You canalso use this cable for drop lines.

Round (mid)The trunk line on the DevicenetTM
network where smaller cable diametersand smaller bend radii are required. Itsoutside diameter is specified by thevendor. This cable can also be used for
drop lines.

Round (thin)

The drop line connecting devices to themain line with an outside diameter of 6.9
mm (0.27 in.). This cable has a smaller
diameter and is more flexible than thickcable. You can also use this cable forthe trunk line.

Flat

The trunk line on the DeviceNetTM
network, with dimensions of 19.3 mm x
5.3 mm (0.76 in. x 0.21 in.). This cablehas no predetermined cord lengths, andyou are free to put connections
wherever you need them.

Unshielded drop cableThis is a non-shielded, 4 conductor,
drop cable for use only in flat cablesystems, with an outside diameter
specified by the vendor.

NOTE: These generic cable types are avialable in a variety of different
offerings such as FLEX, HAZ-DUTY, CLASS I (600V), UV RESISTANT,
etc.

Get Started

1-3

All Devi ceNetTM Cabl in g c omponents selected shal l be s uitable for theenv ironme nt in whi ch they are in sta lled and in particu lar; corrosion resistance,
IP rating and Ultra Violet stabilisation.
Note: DeviceNetTM cables are available in a variety of dif ferent types
including; High flexibil ity, Hazardous duty, Class 1 - 600 Volt, UV resista nt.
Consideration must also be gi ven to environmental protection of cable
compo nents when individual nodes are removed for maintenance and fortesting.
Excessive bending of DeviceNet TM cables can reduce their ability to meetthe Devi ceNetTM specification. Standar d Thick cables shall have a bendi ng
radi us of greater than 3" (75mm). Standard Thin cables shall have a bendi ng
radi us of greater than 2" (50mm).
Round shielded cable (thi ck, mid and thi n) contains five wires: One twisted
pai r (red and black) for 24V dc power; one twisted pair (blue and white) for
signal, and a drain wire (bare).
Flat cable contains four wires: One pair (red and black) for 24 dc power; onepair (blue and white ) for signal.
Unshielded 4-wire drop cable is only designed for use with flat cable systems .

The max imum cable distance is notnecessarily the trunk length only. It is
the m aximum distance between any
two devices.

Determine the Maximum Trunk Line DistanceThe d istance bet ween any two points must not exceed the maximum cabledistance allowed for the data rate used.

Data rate

Maximum
distance(flat cable)

Maximum
dist ance(thick cable)

Maximum
distance(mid cable)

Maximum
distance(thin cable)

125k bi t/s

420m (1378 ft)

500m (1640 ft)

300m (984 ft)

100m (328 ft)

250k bi t/s

200m (656 ft)

250m (820 ft)

250m (8 20 ft)

100m (328 ft)

500k bi t/s

75m (246 ft)

100m (328 ft)

100m (328 ft)

100m (328 ft)

ODVA 2002

Get Started

1-4

For most cases, the maximum distance should be the measurement between
terminating resistors. However, if the distance from a trunk line tap to thefarthest device connected to the trunk line is greater than the distance fromthe tap to the nearest terminating resistor (TR), then you must include thedrop line length as part of the cable length.
Measure the distance between the terminating resistors.

TR

tap

tap

D
D

tap

tap

D

D

3m (9.8 ft)

TR
D

drop
1m (3.3 ft)
D

Always use the longest distance
between any 2 nodes of the network.

If the distance from the TR to
the last tap is greater than the
distance of the drop, thenmeasure from the TR.

Measure both drops and across the trunk.
3m (9.843 ft)
TR

3m (9.843
tap

tap

tap

tap

tap

D
drop
5m (16.405 ft)

D

D

D

D
If the distance fromthe TR to the last
tap is less than the
distance of thedrop, then measurefrom the device.

drop
5m (16.405 ft)

D

TR

D

Determine the Cumulative Drop Line Length
The data rate you choose determines
the maximum trunk line and thecumulative drop line lengths.

The maximum cable distance from any
device on a branching drop line to the trunkline is 6m (20 ft).

ODVA 2002

The cumulative drop line length refers to the sum of all drop lines, thick,thin, or mid cable, in the cable system. This sum cannot exceed the
maximum cumulative length allowed for the data rate used.
Data rate

Cumulative drop line
length125k bit/s

156m (512 ft)

250k bit/s

78m (256 ft)

500k bit/s

39m (128 ft)

Get Started

1-5

The following example uses four T-Port (single-port) taps and two
multi-port taps to attach 13 devices to the trunk line. The cumulative dropline length is 42m (139 ft) and no single node is more than 6m (20 ft) fromthe trunk line. This allows you to use a data rate of 250k bit/s or 125k bit/s. A
data rate of 500k bit/s cannot be used in this example because thecumulative drop line length (42m) exceeds the total allowed (39m) for thatdata rate.

TRTR
2m (6.6 ft)
4m(13 ft)2m(6.6 ft)

5m(16 ft)3m (10 ft)

1m(3.3ft)4m (13 ft)

3m (10)Multiple-porttap (4 ports)

3m(10 ft)

= trunk line

3m(10 ft)2m(6.6 ft)= drop line
= device or node

4m
(13 ft)2m (6.6)
1m(3.3 ft)
3m(10 ft)

Multiple Port tap(8 ports)

TR = terminating resistor

device withremovable
open-styleconnector

About the Direct Connection
Connect devices directly to the trunk line only if you can later remove
the devices without disturbing communications on the cablesystem.This is called a “zero-length” drop, because it adds nothing(zero) when calculating cumulative drop line length.
Important: If a device provides only fixed-terminal blocks for its
connection, you must connect it to the cable system by adrop line. Doing this allows you to remove the device atthe tap without disturbing communications on the trunkline of the cable system.

device with
fixed
open-styleconnector

ODVA 2002

1-6

Get Started

Using Connectors
Connectors attach cables to devices or other components of theDeviceNetTM cable system. Field-installable connections are madewith either sealed or open connectors.
Connector
Wire Wire
Color Identity

Usage
Round

Usage
Flat

white

CAN_H

signalsignal

blue

CAN_L

signalsignal

bare

drain

shield

n/a

black

V-

power

power

red

V+

power

power

Description
Mini-style: Attaches to taps and thick, thin, and mid cable.
Micro-style: Attaches to thin cable only - has a reduced
current rating.

SealedOpen

Plug-in: Cable wires attach to a removable connector.
Fixed: Cable wires attach directly to non-removablescrew terminals (or equivalent) on device.

Micro/Mini field-installable quick-disconnect (sealed) connectors(round media only).
Screw terminals connect the cable to the connector.

Micro Female
V+

2

3
5

1

4

mechanical key
drainmechanical key

V-

CAN_L

CAN_L

CAN_H

1

5

CAN_H 4

2

V-

3

Mini Female
drain

V+

Plug-in field-installable (open) connectors
Most open-style devices ship with an open-style connector included.

probe holes

jack screw

jack screw

V+
CAN_H
drain

VCAN_L
5-pin linear plugODVA 2002

mechanical key

mechanical key

jack screw

jack screw

V+
CAN_H
drain

VCAN_L10-pin linear plug

See Chapter 3 for information about making cable connections

Get Started

2 Terminate

TRTR

the network

1-7

The terminating resistor reduces reflections of the communication signals
on the network. Choose your resistor based on the type of cable (round orflat) and connector (open or sealed) you use
For round cable:– the resistor may be sealed when the end node uses a sealed T-porttap– the resistor may be open when the end node uses an open-style tap
For flat cable:

To verify the resistor connection,
disconnect power and measure theresistance across the Can_H and
Can_L lines (blue and white wires,
respectively). This reading should beapproximately 50-60 ohms.
Do not put a terminating resistor on anode with a non-removable connector.
If you do so, you risk network failure if
you remove the node. You must put theresistor at the end of the trunk line.

–

the resistor is a snap-on cap for the flat cable connector base,available in sealed and unsealed versions

You must attach a terminating resistor equal to 121 ohms, 1%, 1/4W orgreater wattage, to each end of the trunk cable. You must connect these
resistors directly across the blue and white wires of the DeviceNetTM cable.

ATTENTION: If you do not use terminating resistors as!

described, the DeviceNetTM cable system will not operateproperly.

The following terminating resistors provide connection to taps and the trunkline.
sealed-style terminating resistors
Male or female connections attach to:– trunk line ends
– T-Port taps
open-style terminating resistors
121 ohms, 1%, 1/4W or greater wattage resistors connecting the white andblue conductors attach to:– open-style T-Port taps
– trunk lines using terminator blocks

ODVA 2002

1- 8

Get Started

121
Wire
Col orWire
Identi ty

Usage
Round

Usage
Flat

white

CAN_H

signalsignal

blue

CAN_L

signalsignal

bare

drain

shield

n/a

black

V-

power

power

red

V+

power

power

V-

CAN_L

V+

drain

CAN_H

Flat cable terminating resistors
The 121 ohm resistor is contained in the snap-on interface module:– sealed terminator with an Insulation Displacement Connector (IDC)
base (NEMA 6P, 13; IP67)– unsealed terminator with IDC base (no gaskets) (NEMA 1; IP60)
Network endcaps should be included with each flat cable terminator; see
Page 3-12 for complete installation instructions.

terminating resistor with end cap

end cap

Get Started

1-9

Guidelines for Supplying Power

3 Supply power

power
supplyThe cable system requires the power supply to have a rise time of less than
250 milliseconds to within 5% of its rated output voltage. You should verify
the following:
the power supply has its own current limit protection!

Use the power supply topower the DeviceNetTM
cable system only. If adevice requires aseparate 24V powersource other than the
DeviceNetTM powersource, you should usean additional 24V powersource.

– any section leading away from a power supply must have protection
the power supply is sized correctly to provide each device with its
required power
derate the supply for temperature using the manufacturer’s guidelines

DN
PS

Trunk

fuse protection is provided for each segment of the cable system

Important:For class 2 cables, your national and local codes may not

drop
node

node
power

permit the full use of the power system capacity when installed
as building wire. For example, in the United States andCanada, the power supplies that you use with class 2 cablemust be Class 2 listed per the NEC and CECode. The total
current allowable in any section of class 2 cable must notexceed 4A(100VA). Assume that a cable is class 2 unless thevendor describes it as class 1.
Class 1 power supplies allow for an 8A system, and the use ofClass 1 flat cable. See Appendix A for more information about
national and local codes.

Appendix B - Powering Output Devices provides valuable information to theinstaller.
Choosing a Power Supply
The total of all of the following factors must not exceed 3.25% of thenominal 24V needed for a DeviceNetTM cable system.
initial power supply setting - 1.00%
line regulation - 0.30%
temperature drift - 0.60% (total)
time drift - 1.05
- %load regulation - 0.30%
ODVA 2002

1-10

Get Started

Use a power supply that has current limit protection as per national codessuch as NEC, Article 725.

Imp ortant: The dc output of all supplies must be isolated from the ac sideof the power supply and the power supply case.

To determine the required power
supply current:
1. Add the current requirements ofall devices drawing power fromthe network.
For example: 6.3A
2. Add an additional 10% to thistotal to allow for current surge.
e.g. 6.3A x 10% = 6.93A
3. Make sure the total of 2 is lessthan the minimum name-plate
current of the power supply you
are using.e.g. 6.3A < 8A and
NEC/CECodeIf you use a single power supply, add the current requirements of all devices
drawing power from the network. This is the minimum name-plate current
rating that the power supply should have. For proper operation of yournetwork, we recommend that you use a power supply that complies with
the Open DeviceNet Vendor Association (ODVA) power supply
specifications and NEC/CECode Class 2 characteristics (if applicable).

About Power Ratings
Although the round thick cable and Class 1 flat cable are both rated to 8A,
the cable system can support a total load of more than 8A. For example, a
16A power supply located somewhere in the middle of the cable system can
supply 8A to both sides of the power tap. It can handle very large loads aslong as no more than 8A is drawn through any single segment of the trunkline. However, cable resistance may limit your application to less than 8A.
Drop lines, thick, mid or thin, are rated to a maximum of 3A, depending on
length. The maximum current decreases as the drop line length increases.
Drop line length

Allow able current

1.5m (5 ft)

3A

2m (6.6 ft)

2A

3m (10 ft)

1.5A

4.5m (15 ft)

1A

6m (20 ft)

0.75A

You may also determine the maximum current in amps (I) by using:I = 15/L, where L is the drop line length in feet
I = 4.57/L, where L is the drop line length in meters

ODVA 2002

Get Started

1-11

The maximum allowable current applies to the sum of currents for all
nodes on the drop line. As shown in the example on page Page 1-3,
the drop line length refers to the maximum cable distance from any
node to the trunk line, not the cumulative drop line length.
The maximum allowable current may also be limited by highmaximum common mode voltage drop on the V- and V+
conductors– the voltage difference between any two points on the Vconductor must not exceed the maximum common mode
voltage of 4.65V
voltage range between V- and V+ at each node within 11 to 25V

Sizing a Power Supply
Follow the example below to help determine the minimum
continuous current rating of a power supply servicing a common
section.
power
supply 2

power
supply 1

122m(400 ft)
152m(500 ft)
122m(400 ft)
TR

TR = terminating resistor T = T-Port tap
PT = power tap
D = devicePT

60m(200 ft)
30m
30m(100 ft) (100 ft)

T

T

D1
1.50A

D2
1.05A

PT

T

T

T

D3
0.25A

D4
1.00A

D5
0.10A

TR

break V+ (red wire) here to separate
both halves of the network

Power Supply 1
Add each device’s (D1, D2) DeviceNetTM current draw together for power
supply 1 (1.50+1.05=2.55A).
Results

2.55A is the minimum name-plate current rating that power supply 1 shouldhave. Remember to consider any temperature or environmental derating
recommended by the manufacturer.

Important:This derating factor typically does not apply when you consider
ODVA 2002

the maximum short circuit current allowed by the national andlocal codes.

1-12

Get Started

Power Supply 2
Add each device’s (D3, D4, D5) current together for power supply 2(0.25+1.00+0.10=1.35A).

Results

1.35A is the minimum name-plate current rating that power supply 2 shouldhave. Remember to consider any temperature or environmental derating
recommended by the manufacturer.

Placing the Power Supply
DeviceNetTM networks with long trunk lines or with devices on them that draw
large currents at a long distance sometimes experience difficulty with
common mode voltage. If the voltage on the black V- conductor differs bymore than 4.65 volts within the trunk line from one point on the network toanother, communication problems can occur. Note: There is 0.35 volts
reserved for the drop line. Moreover, if the voltage between the black Vconductor and the red V+ conductor ever falls below 15 volts, then common
mode voltage could adversely affect network communication. To work aroundthese difficulties, add an additional power supply or move an existing power
supply closer to the heavier current loads.
To determine if you have adequate power for the devices in your cable system,
use the look-up method which we describe more fully in Chapter 4. See thefollowing example and figure (other examples follow in Chapter 4). You haveenough power if the total load does not exceed the value shown by the curveor the table.
In a worst-case scenario, all of the nodes are together at one end of the cableand the power supply is at the opposite end, so all current flows over the
longest distance.
Power
SupplyNodes

Important:This method may underestimate the capacity of your networkby as much as 4 to 1. See Chapter 4 to use the full-calculation
method if your supply does not fit under the curve.

A sample curve (reprinted from page 4-4) for a single, end-connected
power supply is shown on the next page.

ODVA 2002

Get Started

1-13

Figure 1.1 One Power Supply (End Segment) Flat Cable

Current (amperes)

Important:Assumes all nodes are at the opposite end of the cablefrom the power supply.

NEC/CE Code Maximum
Current Limit
See Appendix A

Length of trunk line, meters (feet)

Network
Lengthm (ft)

Maximum
Current(A)

Network
Lengthm (ft)

Maximum
Current
(A)

0 (0)

8.00*

220 (722)

1.31

20 (66)8.00*

240 (787)

1.20

40 (131)7.01*

260 (853)

1.11

60 (197)

4.72*

280 (919)

1.03

80 (262)3.56

300 (984)

0.96

100 (328)

2.86

320 (1050)

0.90

120 (394)

2.39

340 (1115)

0.85

140 (459)

2.05

360 (1181)

0.80

160 (525)

1.79

380 (1247)

0.76

180 (591)

1.60

400 (1312)

0.72

200 (656)

1.44

420 (1378)

0.69

Exceeds NEC CL2/CECode 4A
ODVA 2002

1-14

Get Started

The following example uses the look-up method to determine theconfiguration for one end-connected power supply. One end-connected
power supply provides as much as 8A near the power supply.
power
supply

TR

PT

30m
m
(100
(100ft)m
23m(75ft)
T

53m(175ft)
(175

D1
0.10A
0.10A
TR = terminating resistor
PT = power tap

106m
(350
(350 ft)

T

T

T

D2
0.15A
0.1 5A

D3
0.30A
0.30A

D4
0.10A
0.10A

TR

T = T-Port tap
D = device

1. Determine the total length of the network.
– 106m2. Add each device’s current together to find the total current consumption.
– 0.10+0.15+0.30+0.10=0.65A
Important: Make sure that the required power is less than the rating of thepower supply. You may need to derate the supply if it is in an
enclosure.

3. Find the next largest network length using the table on page 1-13 todetermine the maximum current allowed for the system (approximately).

– 120m (2.47A)
Results

Since the total current does not exceed the maximum allowable current, thesystem will operate properly (0.65A is less than 2.47A).

Important:If your application doesn’t fit “under the curve,” you may either:Do the full-calculation method described in Chapter 4.
Move the power supply to somewhere in the middle of the cable system
and reevaluate per the previous section.

ODVA 2002

Get Started

1-15

Connecting Power Supplies
To supply power you will need to install and ground the power supplies. To
install a power supply:

Important:Make sure the ac power source remains off during installation.
1. Mount the power supply securely allowing for proper ventilation,connection to the ac power source, and protection fromenvironmental conditions according to the specifications for the supply.
2. Connect the power supply using:– a cable that has one pair of 12 AWG (4 mm2)* conductors or theequivalent or two pairs of 15 AWG (2.5mm2) conductors– a maximum cable length of 3m (10 ft) to the power tap– the manufacturer’s recommendations for connecting the cable to the
supply* NOTE: Metric wire sizes are for reference only - you should select a wire
size big enough for the maximum possible current.

ODVA 2002

1-16

Get Started

4 Groundthe Network

power
supplyYou must ground the DeviceNetTM network at only one location. Follow theguidelines described below.
ATTENTION: To prevent ground loops,!

– For Shielded Round media - Ground the V- conductor,
shield, and drain wire at only one place.
– For Flat media - Ground the V- conductor at only one
place.
Do this at the power supply connection that is closest to thephysical center of the network to maximize the performanceand minimize the effect of outside noise.
Make this grounding connection using a 1 in (25mm) copper
braid or a #8 AWG (10mm2) wire up to a maximum 3m (10 ft) inlength. Where greater than 3M (10 ft) must be used due toinstallation constraints, adequate sized grounding cable shallbe utilized to ensure dffective grounding takes place andprovides a low impedance path from the shield to ground for
optimal shield performance.
If you use more than one power supply, the V- conductor of
only one power supply should be attached to an earth ground.
If you connect multiple power supplies, V+ should be broken
between the power supplies. Each power supply’s chassis
should be connected to the common earth ground. Verify that
V- is isolated from the Power supply chassis.

To ground the network:
Connect the network shield and drain wire to an good earth or building
ground (such as an 8 foot stake driven into the ground, attached tobuilding iron or the cold water plumbing) using a 25 mm (1 in.) copper
braid or a #8 AWG (10 mm2) wire up to 3m (10 ft) maximum in length.
Use the same ground for the V- conductor of the cable system and thechassis ground of the power supply. Do this at the power supply.

Important: For a non-isolated device, be certain that additional network

grounding does not occur when you mount the device or makeexternal connections to it. Check the device manufacturer’s
instructions carefully for grounding information.
ODVA 2002

Round media
wiring terminal

CAN_L
drain
VV+

Wire Wire
Color Identity

Usage
Round

Usage
Flat

CAN_H
CAN_L

white

CAN_H

signalsignal

V-

blue

CAN_L

signalsignal

V+

bare

drain

shield

n/a

black

V-

power

power

red

V+

power

power
V-

V- V+

1-17

Get Started

1-17

Flat media
wiring terminal blockopen-style connector*

One Power Supply

CAN_H

Get Started

L1
L2
grd

V+

power supply

power supply
enclosure*A micro style connector may be used for
power supply connections requiring lessthan 3A. Use a mini or open-styleconnectors for up to 8A.
Two or more Power Supplies for Round Media
CAN_H
CAN_L
drain
VV+

V+ broken between
power supplies

only one ground

V-

V+

V-

power supplyV+

power supply

Two or more Power Supplies for Flat Media
jumper

CAN_H
CAN_L
VV+

V+ broken between
power supplies

V-

V+

V-

power supplyV+

power supply

only one groundenclosure

ODVA 2002

1-18

Get Started

Use this checklist when you install the DeviceNetTM network. You should
complete this checklist prior to applying power to your network.

5 Use thech ecklist

Total device network current draw does not exceed power supply
current limit.
Common mode voltage drop does not exceed limit (as defined in
Section 3, Chapter 1).
Number of DeviceNetTM nodes does not exceed 64 on one

network. The practical limit on DeviceNetTM nodes may
be 61 slave nodes since you should allow one node each for thescanner, the computer interface module, and an open node at node63.*
No single drop over 6m (20 ft).
Cumulative drop line budget does not exceed network baudrate limit.
Total network trunk length does not exceed the maximum allowable
per the network data rate and cable type.
Terminating resistors are on each end of the trunk line and areproper.
Ground, at only one location, preferably in the center of the network–

V- for flat media–

V- drain and shield for round media
All connections are inspected for loose wires or coupling nuts.
Check for opens and shorts.

Imp ortant: * Devices default to node 63. Leave node 63 open to avoid

duplicate node addresses when adding devices. Change thedefault node address after installation.

ODVA 2002

Chapter2

Identify Cable System Components
Use this chapter to identify and become familiar with the basic DeviceNet
cable system components.
terminatorsealed device
T-port tap

Round (Thick, Mid and Thin)
Cable Network

multi port tap(8 port)power
supplythick cable
power
tap

thick cablesealed device

Multi porttap (4 port)thin cable
open-style tap
terminatorthick cable

T-port tap

sealed device
open-style device

enclosure

Flat Cable Network

Open styleconnector
moduleopen-style

power
supplyterminatoropen-style
modulesflat trunk
cable

micro
connector

terminator
PLC
enclosure

ODVA 2002

2-2

Identify Cable System Components

Component

Description

Component

Description

Trunk line

The cable path between terminators that
represents the network backbone.
- can be made of thick, mid, thin, or flatcable
- connects to taps or directly to device.

Multi port tap

A junction box that allows multiple droplines (typically 2, 4, or 8) to connect tothe trunk line.

Drop line

The drop line is made up of thick or thincable.
- connects taps to nodes on the network.

Power tap

The physical connection between the
power supply and the trunk line.

Node/device

An addressable device that contains theDeviceNetTM communication circuitry.

Open-style tap

Screw terminals that connect a dropline to the trunk line.

Terminating
resistor

The resistor (121 Ohm, 1%, 1/4 W orlarger) attaches only to the ends of thetrunk line.

Flat cable microtap

A single-port connection to flat cableavailable in both sealed and unsealed
versions.

Open-styleconnector

Used with devices not exposed to harshenvironments.

Flat cable
Open-Style tap

A single terminal connection to flat
cable available only in unsealed
versions.

Sealed-styleconnector

Used with devices exposed to harshenvironments.

Flat cable
Terminator

A terminating resistor for use with flat
cable, available in both sealed andunsealed versions.

T-Port tap

A single-port connection with sealed
connector.

About Thick Cable
Thick cable, with an outside diameter of 12.2 mm (0.48 in.), is
generally used as the trunk line on the DeviceNetTM network. Thickcable can be used for trunk lines and drop lines.
12.2 mm (0.48 in.) outside diameter
65% coverage tinned copperbraid shieldpolypropylene fillers
jacketoverall mylar tapealuminum/polyester shieldover each pair
18 AWG 19 x 30 tinned copperstranded drain wire (1 mm2)

ODVA 2002

blue & white data-pairfoamed insulation (18AWG
19 x 30 tinned & stranded
copper conductors)(1 mm2)
red & black dc power pair (15 AWG 19 x
28 tinned & stranded copper
conductors)(1.65 mm2)

Note: The mm2 wire sizes in this and similar drawings are for information
only.. The wires are specified in AWG sizes.

Identify Cable System Components

2-3

About Mid Cable
Mid cable, with an outside diameter specified by the vendor, connects
devices to the DeviceNet trunk line via taps. Mid cable can be used for trunklines and drop lines.
Outside diameter specified by vendor
65% coverage tinned copper braid shieldpolypropylene fillers
jacketoverall mylar tapealuminum/polyester shield over each pair
20AWG 19 strand minimum tinned coperstranded drain wire

blue & white data-pair foamed PE/PE insulation (20 AWG 19 Strand Minimum tinned &stranded copper conductors)

red & black dc power pair (18 AWG 19 strand

minimum tinned & stranded copper conductors)

About Thin Cable
Thin cable, with an outside diameter of 6.9 mm (0.27 in.), connects devices
to the DeviceNet trunk line via taps. Thin cable can be used for trunk linesand drop lines.
6.9 mm (0.27in) outside diameter
65% coverage tinned copper braid shieldpolypropylene fillers
jacketoverall mylar tapealuminum/polyester shield over each pair
22 AWG 19 x 34 tinned copper-strandeddrain wire

blue & white data-pair foamed PE/PE
insulation (24 AWG 19 x 36 tinned &stranded copper conductors)
red & black dc power pair (22 AWG 19 x 34
tinned & stranded copper conductors)

ODVA 2002

2-4

Identify Cable System Components

About Flat Cable
Flat cable is physically keyed to prevent wiring mishaps. Flat cable isunshielded and contains four conductors. Flat cable is usually used only forthe trunk line.

dc power pair 16 AWG (1.5 mm2)
black

red

jacket material:
Device NetTM - typically gray
Auxiliary Power: typically black

5.3 mm
(0.21 in.)

white

blue

2.50 mm(0.10 in.)data pair 16 AWG (1.5 mm2)
19.3 mm (0.76 in.)

It is common practice to use a second flat cable to power outputs, e.g.
valves, actuators or indicators. This is called the Auxiliary Power Cable. It
is typically distinguished from the DeviceNetTM by jacket color: typically
black for Auxiliary Power, typically gray for DeviceNetTM .

Connecting to the TrunkLine

The cable system design allows you to replace a device without disturbing
the cable system’s operation.

Important: You must terminate the trunk line on each end with a 121 Ohm,
1%, 1/4W resistor.

ODVA 2002

Identify Cable System Components

2-5

You can connect to the trunk line through a:
Trunk-line connection• T-Port tap

See page

Trunk-line connection

See page

2-6• Multi port tap

2-7

41867

41866

• Power tap

2-7• Multi port tap

2-8

power
supply41868• Open-style connector

41869

2-9

Open-style tap

2-9

41679

• Flat cable open-style connector

2-10• Flat cable micro connector

2-10

ODVA 2002

2-6

Identify Cable System Components

About the T-Port Tap
The T-Port tap connects to the drop line with a mini or micro
quick-disconnect style connector. Mini T-Port taps provide right or left
keyway for positioning purposes. Mini T-Ports are also available with amicro (M12) drop connection .
Mini T-Port tap
Right keyway
CAN_L

Female Connector
End View

drain

CAN_H

CAN_H

V-

Left keyway

Keying InformationV+drain CAN-L

Male Connector
End View

V+

CAN_H

V-

V-

CAN_L

drain

CAN_L

V+ drain

V+

CAN_H

V-

Micro T-Port tap

3

4

2

1

3

4

2

1

5

Male (pins)

femaleconnectors

5

Female (sockets)bare
1 - Drain
2 - V+
redblack
3 - V4 - CAN_H white
5 - CAN_L blue

30428-Mmaleconnector

ODVA 2002

Identify Cable System Components

2-7

About the Multi Port Tap
Multi port taps use round media only for a direct connection to a trunk line.
They provide terminal strip connections for as many as 8 nodes using
thin-cable drop lines. Removable gasket covers and cable glands provide atight, sealed box that you can mount on a machine. Order Multi port taps
according to the trunk type (thick, mid or thin).
2-Port Multi port Tap

4-Port Multi port Tap

8-Port Multi port Tap

About the Power tap
The power tap can provide overcurrent protection to the cable, with fuses
for each trunk. (Country and/or local codes may prohibit the use of the full
capacity of the tap.) You can also use the power tap to connect multiple
power supplies to the trunk line without back-feeding between supplies byremoving one of the fuses. Power taps are only used with round media.

Power tap

Schematic

schematic

CAN_H

CAN_L

CAN_H
CAN_LFuse
V+bare
VV+

Bare
V-

sub-assembly PCB

V-

cable grips
enclosure

Fuse

Schottky
Diode

V+

GND

V-Network
Supply V+

Wire Wire
Color identity

Use

white

CAN_H

signal

blue

CAN_L

signal

bare

drain

shield

black

V-

power

red

V+

power

power supply

In cases in which the power supply provides current limiting and inherent
protection, you may not need fuses/overcurrent devices at the tap.
ODVA 2002

2-8

Identify Cable System Components

About the Multi Port Tap
Multi port taps connect to a round or flat media trunk line via drop lines.
Multi ports connect multiple devices to the network through mini or micro
quick disconnects. The ports of the multi port taps provide connectivity to
the network for multiple nodes at one location.
Micro Version
All device connections are micro female receptacles; only micro maleconnectors with rotating coupling nuts can interface with each port.
Multi port Tap with 2m Drop Line
5-pin fixed internal

thin cable

Mini multi port taps
All device connections in the multi port tap are mini female receptacles; only
mini male connectors can interface with each port. Trunk connection is amini male quick disconnect.

5-Pin mini female connectors
J1
J2
J3
J4
5-pin mini maleconnector

J5

ODVA 2002

J6

J7

J8

Identify Cable System Components

About the Direct Connection

trunk line
disconnect
here

2-9

Connect devices directly to the trunk line only if you can later remove thedevices without disturbing communications on the cable system.

drop line
device with
fixed
open-styleconnector

Important:If a device provides only fixed-terminal blocks for its

connection, you must connect it to the cable system by a dropline. Doing this allows you to remove the device at the tap
without disrupting communications on the cable system.

About the Open-Style Connector
Wire
Color

Wire
Identity

Usage
Round

white

CAN_H

signal

blue

CAN_L

signal

bare

drain

shield

black

V-

power

red

V+

power

Open-style connectors come in two primary varieties:
five-position (5-pin linear plug)
ten-position (10-pin linear plug)
Ten-position connectors provide easier daisy-chaining because there is anindependent wire chamber for each wire (entering cable and exiting cable).
open-style connectors
probe holesmechanical key

mechanical key
jack screw

jack screw

jack screw

Red
White
Shield or Bare

Black
Blue

jack screw

Red
White
Shield or Bare

Black
Blue

5-pin linear plug (open)

10-pin linear plug (open)

Some open-style connectors provide a temporary connection, for a PC orother configurable tool, using probe holes. For connection, insert the prongsof a probe cable into the probe holes of aconnector. Mechanical keys on theconnector prevent improper insertion.
probe holes

insert probe
cable into probe
holes ofconnector

prong
to PC
probe cable

See troubleshooting guide for details.

generic
unsealeddevicemechanical
key
ODVA 2002

2-10

Identify Cable System Components

About Flat Cable Insulation Displacement Connectors(IDCs)
IDCs interface drop cables and devices to the flat cable trunkline. The
hinged, two-piece base snaps around the flat cable at any point along thetrunk. Contact is made with the cable conductors by tightening two screws
that drive the contacts through the cable jacket and into the conductors. The
snap-on interface provides the connection to the drop cable and is available
with various connectors.

CAN_H

CAN_L
V-

V+

Open - StyleODVA 2002

MicroIdentify Cable System Components

Using
Preterminated Cables

2-11

Using preterminated cable assemblies saves you the effort of stripping andwiring connectors to the cable ends and also reduces wiring errors as thesecable assemblies are normally factory tested.

About Thick Cable
You can order preterminated thick cable in several lengths with miniconnectors at each end. Thick cable that is 6m (20ft) or shorter can also be
used as drop lines.
mini T-Portmini T-Port

specified length
male plugrotating
coupling
nut

female plugrotating
coupling
nut

thick cable

thick cablespecifiedlengthAbout Thin Cable
Preterminated thin cable assemblies for use as a drop line are available
with various connectors in several lengths. Preterminated thin cable
assemblies can also be used as trunk lines up to a total of 100 meters in asystem.
Connecting to a T-port tap from a sealed device.

specified length
male plug
female plugdeviceinsert probe
cable into probe
holes ofconnector

T-port tap
specified length
male plug

female plugdeviceT-port tap
mechanical
key
ODVA 2002

2-12

Identify Cable System Components

Connecting to a T-Port tap from an open device

Connecting to a multi port tap or Micro T-Port tap from a sealed device
specified length
female plugmale plugdevicethin cable

to multi port tap, or micro T-Port tap
specified length
male plug

female plugdevicethin cable

to multi port tap, or micro T-Port tap

Connecting to a multi port tap or open-style tap from a sealed device

specified length
Stripped cconductors (pigtails)

to multi port tap

female plugdevicethin cablespecified length

Stripped conductors (pigtails)

to multi port tap

ODVA 2002

thin cable

female plugdeviceIdentify Cable System Components

2-13Connecting to micro T-Port taps
devicedevicedrop lines

thin cablespecifiedlengthtrunk line

Connecting to a flat cable tap from a sealed device
specified length
male plug

female plugdevicethin cable

to flat cable Micro
specified length
female plugmale plugdevicethin cable

to flat cable Micro

About Terminators
Wire
Wire
Color Identity

Usage
Round

Usage
Flat

white

CAN_H

signalsignal

blue

CAN_L

signalsignal

bare

drain

shield

n/a

black

V-

power

power

red

V+

power

power

Electrically stabilize your DeviceNetTM communication with terminating
resistors.

Important: You must terminate the trunk line on each end with a 121ohms,
1%, 1/4W resistor.

ODVA 2002

2-14

Identify Cable System Components

Sealed-style terminators (round media )Male and female sealed terminators are available in mini and micro versions.

Mini-male terminator

Mini-female terminator

Unsealed-Style terminator (round and flat media)
Important: You must connect these resistors directly across the blue andwhite wires of the DeviceNetTM cable.
An open-style terminator is suitable for use with:
Multi-port taps (open style taps only)
open-style plugs or taps
Flat cable open-style Insulation Displacement Connectors (IDC)
121ohms

end cap

Flat cable IDC with
open-style terminator

Sealed and unsealed flat media terminators
These terminators have an IDC base and are shipped with an end cap.
Unsealed terminators do not have gaskets.

A means of sealing aflat cable connector.

ODVA 2002

Chapter

3

Make Cable Connections
Preparing Cables

In Chapter 1, you determined the required lengths of trunk line and drop line
segments for your network. To cut these segments from reels of thick, thin,
mid and flat cable, use a sharp cable cutter and provide sufficient length ineach segment to reduce tension at the connector.

Select an end of the cable segment that has been cleanly cut.
The positions of the color-coded conductors should match the positions at
the face of the connector.

Important:

Before beginning, make sure:the DeviceNet cable system is inactive
all attached devices are turned off
any attached power supply is turned off
you follow the manufacturer’s instructions for stripping,
crimping, and/or tightening

The dimensions and instructions in this chapter are typical formany connectors. Some connectors are different. Follow theconnector manufacturer’s instructions if they differ from thosein this chapter.

ODVA 2002

3-2

Make Cable Connections

How to Install Open-Style
Connectors

To attach a plug-in open-style connector to a round media (thick, mid orthin) trunk line:
1. Strip 65 mm (2.6 in.) to 75 mm (3 in.) of the outer jacket from the end of
the cable, leaving no more than 6.4 mm (0.25 in.) of the braided shield
exposed.
6.4 mm(0.25 in.)jacketbraided shield

65 mm(2.6 in.)2. Wrap the end of the cable with 38 mm (1.5 in.) of shrink wrap, covering
part of the exposed conductors and part of the trunk line insulation.
jacket

38 mm(1.5 in.)shrink wrap

3. Strip 8.1 mm (0.32 in.) of the insulation from the end of each of theinsulated conductors.
jacketshrink wrap

8.1 mm(0.32 in.)4. Tin the last 6.5 mm (0.26 in.) of the bare conductors or crimp a suitableferrule on the conductors.
5. Insert each conductor into the appropriate clamping cavity of the
open-style connector or the screw terminal on the device, according to
the color of the cable insulation.
clamping
Wire
Color

Wire
Identity

Usage
Round

white

CAN_H

signal

blue

CAN_L

signal

bare

drain

shield

black

V-

power

red
white
bare

red

V+

power

blue

6. Tighten the clamping screws tosecure each conductor. The
male contacts of the device
connector must match thefemale contacts of theconnector.

red
white
open-style connector(female contacts)

bare
blue
black

black
open-style connector(female connector)
bluebare white
red

black
open-style receptacle(male contacts)

ODVA 2002

Make Cable Connections

3-3

How to Install Mini/Micro Sealed Field-Installable
Connectors
To attach a mini/micro sealed-style connector to round media:
1. Prepare the cable jacket by cleaning loose particles from the jacket.
70mm(2.75 in.)jacketclean jacket

30 mm(1.2 in.)2. Strip 30 mm (1.2 in.) of the cable jacket from the end of the cable.
3. Cut the braided shield and the foil shields surrounding
the power and signal conductors.
4. Trim the conductors to the same length.
5. Slide the connector hardware
onto the cable in the ordershown.
Wire Wire
Color identity

Usage
Round

white

CAN_H

signal

blue

CAN_L

signal

bare

drain

shield

black

V-

power

red

V+

power

6. Strip 10 mm (0.4 in.) of
insulation from the ends of all
conductors except the baredrain wire.

rubber washer
grommetenclosurerear nut
slide hardware
bevelled
Do not nick the
conductor strands.

9 mm(0.374 in.)

Important: Do not twist or pull the cable while tightening the gland nut.

7. Attach wires to the connector using screw terminals as seen in thefollowing diagram.

Mini male connector

Mini female connector

power conductors

red

black
white

signalbare
conductors

bare

blue

black
red
white

power conductors

Rear View

signalconductors

bareblue bare

Rear View

8. Screw the enclosure body to the connector.
9. Screw the rear nut into the connector enclosure.

Important: Do not twist or pull the cable while tightening the rear nut.
ODVA 2002

3-4

Make Cable Connections

How to Install Power Tapsand Multi Port Taps withTerminals

Cable preparation and attachment is the same for Power taps and Multi Porttaps which use hard-wire connections of round media. To install your taps,
perform the following steps and then proceed to the appropriate section forwiring the specific tap.
1. Remove the cover from the tap.
2. Prepare the ends of the cable sections.

A. Strip 65 mm (2.6 in.) to 76 mm (3 in.) of the outer jacket
76 mm(3 in.)

jacketand braided shield from the end of the cable.

– Leave no more than 6.4 mm (0.25 in.) of the braided shield exposed.
6.4 mm(0.25 in.)braided shield

B. Strip 8.1 mm (0.32 in.) of the insulation from the end of each of theinsulated conductors.
heat shrink

8.1 mm(0.32 in.)3. Attach cables to the enclosure.

4. Insert conductors into the terminal block clamping cavities, following thecolor coding specified for the terminal blocks.
thick cable terminal blocks

Wire
identity

Use

white

CAN_H

signal

blue

CAN_L

signal

bare

drain

shield

black

V-

power

red

V+

power

red

ODVA 2002

red
white
drain
blue
black
red
white
drain
blue
black
red
white
drain
blue
black
red
white
drain
blue
black

black
blue
drain
white
red

Wire
Color

black
blue
drain
white
red
black
blue
drain
white
red
black
blue
drain
white
red
black
blue
drain
white

red
white
drain
blue
black

thin cable terminal blocks

trunk line
(thick cable)

trunk line
(thick cable)

drop lines(thin cable)

plug
and nut

drop lines(thin cable)
plug and nut
locking nut
hex flange
gland nut

Make Cable Connections

3-5

5. Tighten all clamping screws to secure conductors to the terminal blocks.
6. Seal unused ports.
7. Tightly secure the cover to the enclosure.

How to Install Multi Port Taps with Sealed Connectors
The Multi Port tap connects multiple quick-disconnect cables to the trunk
line.

Cable

To Connect Drop Lines

J1

J2 J3

J4

J5

J6 J7

J8

When installing Multi Port Taps or removing nodes for maintenance it isimportant to seal unused ports to maintain the integrity of the IP ratingof the installation. Use suitable threaded plugs to seal unusedconnectors
Drop lines, made up of thick, mid or thin cable, connect devices to taps.
Connections at the device can be:
open-style– pluggable screw connectors– hard-wired screw terminals– solderedsealed-style– mini quick-disconnect connectors– micro quick-disconnect connectors
Important: It is best to connect drop lines when the cable system isinactive. If you must connect to an active cable system, makeall other connections before the connection to the trunk line.

!

ATTENTION: Although it is possible to make a screw-terminal
connection while the cable network is active, you should avoid
this if at all possible.

ODVA 2002

3-6

Make Cable Connections

To connect drop lines:
1. Attach contacts as described earlier in this section.
2. Connect the cable to the device.
3. Make any intermediate connections.
4. Make the connection to the trunk line last
5. Add and record measured drop length on cabling documentation.
Important: Follow the wiring diagrams for each connection, and make sure
you do not exceed the maximum allowable length from thedevice connection to the trunk connection.

Flat Cable Installation
Instructions

How to Install a Flat Cable Connector
Install flat cable with the wider flat edge of the cable on the bottom.

keyed edge

flat edge

Follow these steps to properly install flat cable into a connector: (Note thatthe connector base is not mounted to the panel until sept 4.)

1. Lay the cable in the hinged base, paying attention to the keyed profile;the unkeyed edge is closer to the hinge, the keyed edge is toward thelatch.

Important: Prior to closing the connector, make sure the IDC blades do not
protrude from the housing. If the blades are exposed, gently
push them back into the base. In the event that the blades do
not retract easily (or retract only partially), verify that the IDC
screws are not partially driven.

ODVA 2002

Make Cable Connections

3-7

keyed edge istoward the latch

latch

2. Close the hinged assembly, applying pressure until the latch locks into

place.The latch has two catches. The first catch loosely holds theconnector on the cable. The second catch needs more pressure applied
to close the connector tightly. If the cable is not in the correct position,
the connector will not close.

ODVA 2002

3-8

Make Cable Connections

3. Make sure the cable is straight before moving on to step four.

!
the metal inserts.

ATTENTION: You must make sure the cable is straight before
tightening the screws. Improper seating of the cable may causea weak seal and impede IP67 requirements for the life of thecable. A misaligned cable may also cause shorts due to
mis-registration of the IDC contacts.

4. Tighten down the two screws at the center points of the hinge and latchsides of the base; tighten down the latch side first. Take care to avoid
stripping, ample torque per manufacturers specifications. Mount thebase to the panel by driving screws through the corner holes notcontining the metalinserts.

Check the cable
position prior totightening thescrews.

Tighten screws
by the latch first

5. Drive the IDC contacts into the cable by tightening down the two screws
in the center of the base assembly. Once again, be careful to avoid
stripping, ample but not excessive torque should be used.

The module should not
be removed afterconnection is made.
Determine the exact
placement of theconnector before
engaging the IDC
contacts.

ODVA 2002!

ATTENTION: Once the
IDC contacts are driven
into the cable, themodule should not be
removed. If the module
is removed, it must be
discarded and proper
cable healing
techniques must be
used to protect thewaterproofing to IP67.

Make Cable Connections

3-9

6. Line up the keyed rectangular holes of the micro/open/terminator/otherconnection interface with the matching posts on the base and snap theconnection interface into place. Optional: Secure the micro/open/
terminator module by driving screws through the two remaining
mounting holes.

two remaining
mounting holes

Additional considerations: When used in flexing applications, the cablemust be secured to a solid reference with mounting hardware 10-15 cm (4-6in.) from the connector.
Installation of connectors is recommended only at temperatures of 0°C 75°C.
Make sure the cable is free of debris or scratches before attaching theconnector to ensure a proper seal.
The recommended distance between cable mounts is 3-5 m (10-16 ft) .
Special glands are available for running cable into an enclosure.
Installing a flat cable open-style connector to a drop cable
Install the flat cable open-style connector to the flat media using thedirections starting on page 3-6. Prepare the drop cable following thedirections on page 3-2 numbers 1 through 5. For flat media connections you
can use shielded or unshielded drop cables– You must cut or heat shrink the drain wire when you use shielded
drop cable.

red

Wire Wire
Color identity

Use

Flat

white

CAN_H

signalsignal

blue

CAN_L

signalsignal

bare

drain

shield

n/a

black

V-

power

power

red

V+

power

power

white

Theunshielded
drop cable has
no drain wire.

blue

black

red

white

blue

black

To use shielded drop
cable, bend back andheat shrink, or cut, thedrain wire.

ODVA 2002

3-10

Make Cable Connections

End Cap Installation
Each flat cable terminator module needs an end cap designed to cover the
exposed end of the cable. To install the end cap:
1. Fit the end cap on the cable as keyed. Align the end cap posts with thereceptacles in the lower IDC base and press down until the end cap isfirmly seated (the upper surface of the posts will be flush with the uppersurface of the base).
End Cap

Align the end cap
posts withreceptacles in thebase.

2. Close the IDC base and continue with the connection process..

When installing an end cap on the other end of the cable, note that theguide receptacles are on the upper portion of the IDC base. Repeat the end
cap installation process as outlined previously. Close the IDC base andcontinue with connection. .

ODVA 2002

Make Cable Connections

3-11

Installing Auxiliary Power Cable

Auxiliary Power Cable
Wire
Color

Wire
identity

Use

white

user
defineduser
definedblueuser
defineduser
definedblackV-output
power

red

V+

outputpower

Install Auxiliary Power Cable as you would network cable. Refer to page 3-6
for installation instructions..
red and blackdc power pair 16 awg (1.5 mm2)
jacket2.50 mm(0.10 in.)

5.3 mm
(0.21 in.)white and blue
user defined pair 16 awg (1.5 mm2)
19.3 mm(0.76 in.)

When running cable into an enclosure, use a flat cable gland.
Pinout diagrams for micro and mini connections to the power cable areshown next.
Mini Female

Micro FemaleV+3
5 user defined

1

4

mechanical key
not usedV-

2

Connecting Power
Supplies to Round Media

user definedmechanical key
user defineduser defined

5

1

4

2
3

not usedV+V-

To supply power you will need to install and ground the power supplies aswell as connect all Power taps.If you haven’t determined power supply
placement, see Chapter 4. To install a power supply:
Important: Make sure the ac power source remains off during installation.
1. Mount the power supply securely allowing for proper ventilation,connection to the ac power source, and protection from environmental
conditions according to the specifications for the supply.
2. Connect the power supply using:a cable that has one pair of 12 AWG (3.3mm2) conductors or theequivalent or two pairs of 15 AWG (1.7mm2) conductors
a maximum cable length of 3m (10 ft) to the Power tap
the manufacturer’s recommendations for connecting the cable to the
supplyODVA 2002

3-12

Make Cable Connections

Connecting Power
Supplies to Flat Cable

Use a flat cable tap to connect power. Choose a tap that is suitable for the
expected current.
Because these taps have no overcurrent protection, you must provide suchprotection (fuse or circuit breaker) externaly or use a current-limited power
supply.
Only connect V+ (red) and V- (black) unless the power supply is designed
for use with DeviceNetTM and requires all conductors. If you use a molded
connector that includes the other conductors CAN_H (white) and CAN_L(blue) ensure these are not connected at the power supply. Cut andinsulate them. Their length must be included in the cumulative drop length
calculation.

ODVA 2002

Chapter4

Determine Power Requirements
In this chapter, we describe two methods for determining your system’s
power requirements:
the look-up method
the full-calculation method
Try the look-up method first, then move on to the full-calculation method if
you cannot meet your configuration requirements.

Important: You must consider two areas when powering output devices
using the DeviceNetTM power supply:(1) Wide DeviceNetTM voltage range of 11-25V dc(2) Noise or transient protection at each device
You must calculate a worst-case situation, and maintain voltage
within the 11-25V dc range on all segments. This can beaccomplished using diodes or other similar techniques. See
Appendix B, Powering Output Devices, for more information.

Use the Look-UP Method

To determine if you have adequate power for the devices in your cablesystem, see the following examples and figures. You have enough power if
the total load does not exceed the value shown by the curve or the table.
In a worst-case scenario, all of the nodes are together at the opposite endof the cable from the power supply.
Nodes

Power Supply

ODVA 2002

4-2

Determine Power Requirements

Important: This method may underestimate the capacity of your networkby as much as 4 to 1. See the following section to use thefull-calculation method if your supply does not fit under the
curve.
Flat
Thick
Mid
Thin
cable
cable
cable
cable
uses
uses
uses
uses
figurefigurefigurefigureOne power supply
Figure Figure Figure Figure(end-connected)
4.2
4.1
4.7
4.8
One power supply
Figure Figure
Figure(middle-connected)
4.2
4.1
4.8
NEC/CECode current boost
Figure Figure
Figureconfiguration (V+ cut)
4.2
4.1
4.8
Two power supplies
Figure Figure*(end-connected)
4.6
4.5
Two power supplies (notFigure Figure*
end-connected)
4.4
4.3* You can draw as much as 3A from a thin cable trunk line if the power
supply separation is below 70m (230 ft).
For this configuration
exampleODVA 2002

Determine Power Requirements 4-3

Current (amperes)

Figure 4.1 One Power Supply (End Segment) Round Cable (Thick)
Important: Assumes all nodes are at the opposite end of the cable fromthe power supply.

NEC/CE Code Maximum
Current Limit
See Appendix A

Length of trunk line, meters (feet)

Network
Lengthm (ft)

Maximum
Current(A)

Network
Lengthm (ft)

Maximum
Current
(A)

0 (0)

8.00*

240 (787)

1.28

20 (66)8.00*

260 (853)

1.19

40 (131)6.53*

280 (919)

1.10

60 (197)

4.63*

300 (984)

1.03

80 (262)3.59

340 (1115)

0.91

100 (328)2.93

360 (1181)

0.86

120 (394)

2.47

380 (1247)

0.82

140 (459)

2.14

420 (1378)

0.74

160 (525)

1.89

440 (1444)

0.71

180 (591)

1.69

460 (1509)

0.68

200 (656)

1.53

480 (1575)

0.65

220 (722)

1.39

500 (1640)

0.63

*

Exceeds NEC CL2/CECode 4A limit.

ODVA 2002

4-4

Determine Power Requirements

Figure 4.2 One Power Supply (End Segment) Flat Cable

Current (amperes)

Important: Assumes all nodes are at the opposite end of the cable from thepower supply.

NEC/CE Code Maximum
Current Limit
See Appendix A

Length of trunk line, meters (feet)

Network
Lengthm (ft)

Maximum
Current(A)

Network
Lengthm (ft)

Maximum
Current
(A)

0 (0)

8.00*

220 (722)

1.31

20 (66)8.00*

240 (787)

1.20

40 (131)7.01*

260 (853)

1.11

60 (197)

4.72*

280 (919)

1.03

80 (262)3.56

300 (984)

0.96

100 (328)

2.86

320 (1050)

0.90

120 (394)

2.39

340 (1115)

0.85

140 (459)

2.05

360 (1181)

0.80

160 (525)

1.79

380 (1247)

0.76

180 (591)

1.60

400 (1312)

0.72

200 (656)

1.44

420 (1378)

0.69

*

ODVA 2002

Exceeds NEC CL2/CECode 4A limit.

Determine Power Requirements

4-5

Figure 4.3 Two Power Supplies, (one end connected, one middle
connected) Two Cable Segments, Round Cable (Thick)Segment A

Current (amperes)

NEC/CE Code Maximum
See Appendix A

Segment B

Total Length of trunk line, meters (feet)
Power Supply A

Power Supply B

Network
Lengthm (ft)

Maximum
Current (A)Network
Lengthm (ft)

Maximum
Current (A)

0 (0)

8.00*

260 (853)

8.00*

20 (66)8.00*

280 (919)

7.69*

40 (131)8.00*

300 (984)

7.21*

60 (197)8.00*

320 (1050)

6.78*

80 (262)8.00*

340 (1115)

6.41*

100 (328)

8.00*

360 (1181)

6.07*

120 (394)

8.00*

380 (1247)

5.76*

140 (459)

8.00*

400 (1312)

5.49*

160 (525)

8.00*

420 (1378)

5.24*

180 (591)

8.00*

440 (1444)

5.01*

200 (656)

8.00*

460 (1509)

4.80*

220 (722)

8.00*

480 (1575)

4.73*

240 (787)

8.00*

500 (1640)

4.66*

*

Exceeds NEC CL2/CECode 4A limit.

Network
Lengthm (ft)

Maximum
Current (A)Network
Lengthm (ft)

Maximum
Current (A)

0 (0)

8.00*

260 (853)

1.89

20 (66)8.00*

280 (919)

1.76

40 (131)8.00*

300 (984)

1.64

60 (197)

7.38*

320 (1050)

1.54

80 (262)5.71*

340 (984)

1.46

100 (328)

4.66*

360 (1050)

1.38

120 (394)

3.94

380 (1247)

1.31

140 (459)

3.40

400 (1312)

1.24

160 (525)

3.00

420 (1378)

1.18

180 (591)

2.68

440 (1444)

1.13

200 (656)

2.43

460 (1509)

1.08

220 (722)

2.22

480 (1575)

1.07

240 (787)

2.08

500 (1640)

1.05

*

Exceeds NEC CL2/CECode 4A
ODVA 2002

4-6

Determine Power Requirements

Figure 4.4 Two Power Supplies, (one end connected, one middle
connected) Two Cable Segments, Flat Cable

Current (amperes)

Segment A

NEC/CE Code Maximum
Current Limit
See Appendix A
Segment B

Total Length of trunk line, meters (feet)
Segment Supply A

Segment Supply B

Network
Lengthm (ft)

Maximum
Current(A)

Network
Lengthm (ft)

Maximum
Current(A)

Network
Lengthm (ft)

Maximum
Current(A)

Network
Lengthm (ft)

Maximum
Current
(A)

0 (0)

8.00*

220 (722)

8.00*

0 (0)

8.00*

220 (722)

2.08

20 (66)8.00*

240 (787)

8.00*

20 (66)8.00*

240 (787)

1.91

40 (131)8.00*

260 (853)

7.91*

40 (131)8.00*

260 (853)

1.76

60 (197)8.00*

280 (919)

7.35*

60 (197)

7.52*

280 (919)

1.64

80 (262)8.00*

300 (984)

6.86*

80 (262)5.67*

300 (984)

1.53

100 (328)

8.00*

320 (1050)

6.43*

100 (328)

4.55*

320 (1050)

1.43

120 (394)

8.00*

340 (1115)

6.06*

120 (394)

3.80

340 (984)

1.35

140 (459)

8.00*

360 (1181)

5.72*

140 (459)

3.26

360 (1050)

1.28

160 (525)

8.00*

380 (1247)

5.43*

160 (525)

2.86

380 (1247)

1.21

180 (591)

8.00*

400 (1312)

5.16*

180 (591)

2.54

400 (1312)

1.19

420 (1378)

4.91*

200 (656)2.29

420 (1378)

1.09

*

ODVA 2002

Exceeds NEC CL2/CECode 4A limit.

*

Exceeds NEC CL2/CECode 4A limit.

Determine Power Requirements

4-7

Current (amperes)

Figure 4.5 Two End-Connected Power Supplies, Round Cable (Thick)

NEC/CE Code
Maximum
Current Limit
See Appendix A

Length of trunk line, meters (feet)

Network
Length m (ft)Maximum
Current (A)Network
Length m (ft)Maximum
Current (A)

0 (0)

8.00*

260 (853)

4.25*

20 (66)8.00*

280 (919)

3.96

40 (131)8.00*

300 (984)

3.70

60 (197)8.00*

320 (1050)

3.48

80 (262)8.00*

340 (1115)

3.28

100 (328)

8.00*

360 (1181)

3.10

120 (394)

8.00*

380 (1247)

2.94

140 (459)

7.68*

400 (1312)

2.79

160 (525)

6.77*

420 (1378)

2.66

180 (591)

6.05*

440 (1444)

2.55

200 (656)

5.47*

460 (1509)

2.44

220 (722)

4.99*

480 (1575)

2.34

240 (787)

4.59*

500 (1640)

2.25

*

Exceeds NEC CL2/CECode 4A
ODVA 2002

4-8

Determine Power Requirements

Current (amperes)

Figure 4.6 Two End-Connected Power Supplies, Flat Cable

NEC/CE Code
Maximum
Current Limit
See Appendix A

Length of trunk line, meters (feet)

Network
Length m (ft)Maximum
Current (A)Network
Length m (ft)Maximum
Current (A)

0 (0)

8.00*

220 (722)

4.69*

20 (66)8.00*

240 (787)

4.30*

40 (131)8.00*

260 (853)

3.97

60 (197)8.00*

280 (919)

3.69

80 (262)8.00*

300 (984)

3.44

100 (328)

8.00*

320 (1050)

3.23

120 (394)

8.00*

340 (1115)

3.04

140 (459)

7.35*

360 (1181)

2.87

160 (525)

6.43*

380 (1247)

2.72

180 (591)

5.72*

400 (1312)

2.59

200 (656)

5.16*

420 (1378)

2.46

*

ODVA 2002

Exceeds NEC CL2/CECode 4A

Determine Power Requirements

4-9

Figure 4.7 One Power Supply (End Segment) Round Cable (Mid)

4.50
4.00
NEC/CE Code
Maximum
Current Limit
See Appendix A

Current (amperes)

3.50
3.00
2.50
2.00
1.50
1.00
0.50
0
0(0)

25
(82)

50
(164)

75
(246)

100
(328)

125
(410)

150
(492)

175
(574)

Length of Trunk Line meters (feet)

Network
Length m (ft)ODVA 2002

Maximum
current (A)

0 (0)

1.50

25 (82)

1.50

50 (164)1.50

75 (246)1.50

100 (328)

1.50

125 (410)

1.28

150 (482)

1.08

175 (574)

0.93

200 (656)0.81

225 (738)

0.72

250 (820)

0.65

275 (902)

0.59

300 (984)

0.55

200
(656)

225
(738)

250
(820)

275
(902)

300
(984)

4-10

Determine Power Requirements

Figure 4.8 One Power Supply (End Segment) Round Cable (Thin)

Current (amperes)

NEC/CE Code
Maximum
Current Limit
See Appendix A

Length of trunk line, meters (feet)

ODVA 2002

Network
Length m (ft)Maximum
Current (A)

0 (0)

3.00

10 (33)3.00

20 (66)3.00

30 (98)2.06

40 (131)

1.57

50 (164)

1.26

60 (197)

1.06

70 (230)

0.91

80 (262)0.80

90 (295)

0.71

100 (328)

0.64

Determine Power Requirements

4-11

One Power Supply (End-Connected)
The following example uses the look-up method to determine theconfiguration for one end-connected power supply. One end-connected
power supply provides as much as 8A near the power supply.
power
supplyTRP

30m(100 ft)
23m(75 ft)T

106m(350 ft)

53m(175 ft)

D1
0.10A

T

T

T

D2
0.15A

D3

D4
0.10A

0.30A

TR

TR = terminating resistor T = T-Port tap
PT = Power tap
D = device

1. Determine the total length of the network.
– 106m2. Add each device’s current together to find the total current.

– 0.10+0.15+0.30+0.10= 0.65A
Important: Make sure that the required power is less than the rating of thepower supply. You may need to derate the supply if it is in an
enclosure.

3. Find the value next largest to the network length using Figure 4.1 on
page Page 4-3 to determine the maximum current allowed for the system(approximately).
– 120m (2.47A)
Results

Since the total current does not exceed the maximum allowable current, thesystem will operate properly (0.65A < 2.47A).
Important: If your application doesn’t fit ‘‘under the curve”, you may either:•do the full-calculation method described later in this chapter•

move the power supply to somewhere in the middle of the cable system
and reevaluate per the following section

ODVA 2002

4-12

Determine Power Requirements

One Power Supply (Middle-Connected)
The following example uses the look-up method to determine theconfiguration for one middle-connected power supply. One middle-connected
power supply provides the maximum current capability for a single supply.

power
supplysection122m(400 ft)

91m(300 ft)

91m
(300

T

T

T

122m
(400

49m
(160 ft)

37m(120 ft)Tsection

PT

D2
D3
D1
1.25A
0.50A
1.10A
TR = terminating resistor T = T-Port tap
PT = Power tap
D = device

T

T

T

D4
0.25A

D5
0.25A

D6
0.25A

T

1. Add each device’s current together in section 1.
– 1.10+1.25+0.50 = 2.85A
2. Add each device’s current together in section 2.
– 0.25+0.25+0.25 = 0.75A
3. Find the value next largest to each section’s length to determine themaximum current allowed for each section (approximately).
–

Section 1 = 140m (2.14A)– Section 2 = 140m (2.14A)
Important: Section 1 + Section 2 = 3.6A. This is < 4A for NEC/CECodecompliance.
Results

Section 1 is overloaded because the total current exceeds the maximum
current (2.85A>2.14A).
Section 2 is operational since the total current does not exceed the maximum
current (0.75A< 2.14A).

ODVA 2002

Balance the system by moving the power supply toward the overloaded
section (section 1). Then recalculate each section.

Determine Power Requirements 4-13
power
supplysection 1
86m(282 ft)

T

55m(180 ft)

127m(417 ft)
1m(3 ft)

Tsection 2

T

T

D
D2
1.10A
1.25A
TR = terminating resistor
PT = Power tap

PT

85m(279 ft)

D3
0.50A
T = T-Port tap
D = device

158m(518 ft)

T

T

T

D4

D5

D6

0.25A

0.25A

T

0.25A

4. Add each device’s current together in section 1.
– 1.10+1.25+0.50 = 2.85A
5. Add each device’s current together in section 2.
– 0.25+0.25+0.25 = 0.75A
6. Find the value next largest to each section’s length using Figure 1 on
page Page 4-3 to determine the maximum current allowed for eachsection (approximately).
– Section 1 = 100m (2.93A)– Section 2 = 160m (1.89A)
Important: Section 1+ Section 2 = 3.6A. This is < 4A for NEC/CECodecompliance. However, if due to derating of the power
supply, you had to use over a 4A power supply, you would
exceed the NEC/CECode maximum allowable current.

Results

Section 1 is operational since the total current does not exceed the
maximum current (2.85A <2.93A).
Section 2 is operational since the total current does not exceed the
maximum current (0.75A <1.89A).
Adjusting the Configuration
To make the system operational, you can:• move the power supply in the direction of the overloaded section• move higher current loads as close to the supply as possible• move devices from the overloaded section to another section• shorten the overall length of the cable system• perform the full-calculation method for the segment described later inthis chapter for the non-operational section
ODVA 2002

4-14

Determine Power Requirements• add a second power supply to the cable system (do this as a last resort)as shown in the following three examples

NEC/CECode Current Boost Configuration
If the national or local codes limit the maximum rating of a power supply,
use the following configuration to replace a single, higher current power
supply.
power
supplysection 1
91m(300 ft)

T

T

D3
1.10A

T

PT

T

D2
1.25A

D1
0.50A

TR = terminating resistor
PT = Power tap

section 2

power
supplyPT

152m(500 ft)T

protection devices
D4
removed from center
0.25A
V+ section(supplies are isolated)
V- section is continuous

T

T

D5
0.25A

D6

T

0.85A

T = T-Port tap
D = device

This configuration effectively doubles the available current. It has thefollowing characteristics:• no loads are allowed between the Power taps
• fuses between the two Power taps must be removed to segment
the V+ conductor in the trunk line between the taps
– also cut V+ (red) flush with cable jacket
These are the Power tap modifications.
Wire Wire
Color identity

Use

white

CAN_H

signal

blue

CAN_L

signal

bare

drain

shield

black

V-

power

red

V+

power

CAN_
CAN_L
trunk line drain
VV+

V+ Vpower
supplyODVA 2002

removethese
fuses
groundV- V+
powersupply• essentially two independent segments, each of which is a “one power
supply end-connected system”

Determine Power Requirements

4-15• each power supply can be rated up to 4A and still meet NEC/CECode
Class 2 current restrictions

Two Power Supplies (End-Connected) in Parallel with No V+ BreakThe following example uses the look-up method to determine theconfiguration for two end-connected power supplies. You must use diodes atthe power taps to prevent back-feeding of the power supplies. Check yournational and local codes for any restrictions on the use of parallel power
supplies. The NEC/CECode requires that the power supplies must be listed
for parallel operation.

power
supplypower
supply274m(900 ft)

122m(400 ft)
76m(250 ft)
30m(100 ft)

122m(400 ft)
76m(250 ft)
30m(100 ft)
T
PT

T

T

T

T

T

D1
0.25A

D2
0.50A

D3
0.10A

D4
0.25A

D5
1.00A

TR PT

TR = terminating resistor
PT = Power tap

TR

D6
0.10A

T = T-Port tap
D = device

1. Determine the total length of the network.
– 274m2. Add each device’s current together to find the total current.
– 0.25+0.50+0.10+0.25+1.00+0.10 = 2.20A
3. Find the value next largest to each section’s length using Figure 4.5 on
page 4-7 to determine the maximum current allowed for each section(approximately).
– 280m (3.96A)

Results

Since the total current does not exceed the maximum current, the system
will operate properly (2.20A <3.96A).

ODVA 2002

4-16

Determine Power Requirements

Two Power Supplies (Not End-Connected) in Parallel withNo V+ BreakThe following example uses the look-up method to determine theconfiguration for two power supplies that are not end-connected. Thisconfiguration provides the most power to the cable system. You must use
diodes at the power taps to prevent back-feeding of the power supplies. Check
your national and local codes for any restrictions on the use of parallel power
supplies.
segment 1

segment 2

power
supply274m(900 ft)
152m(500 ft)
122m
76m(250 ft) (400 ft)
TR

T

PT

T

T

segment 3
power
supply61m(200 ft)

122m(400 ft)

30m(100 ft)
PT

D1
D2
D3
2.25A
1.50A 2.00A
TR = terminating resistor T = T-Port tap
PT = Power tap
D = device

T

T

T

D4
0.25A

D5
1.00A

D6
0.30A

TR

1. Determine the trunk line length of one end section (for this example wewill use section 3).
– 122m2. Add each device’s current together in section 3.
– 0.25+1.00+0.30 = 1.55A
3. Find the value next largest to the length of section 3 using Figure 4.3 on
page 4-5 to determine the maximum current allowed (approximately).
– 140m (3.40A)
Important: If the total current in the section exceeds the
maximum current, move the power supply closer to theend and repeat steps 1-3 until the total current in the sectionis less than the maximum allowable current.

Results
ODVA 2002

Since the total current does not exceed the maximum current, section 3 will
operate properly (1.55A < 3.40A).
Loading is 46% (1.55/3.40).

Determine Power Requirements

4-17

4. Determine the trunk line length of the other end section (section 1).
– 76m
5. Add each device’s current together in section 1.
– 2.25A
6. Find the value next largest to the length of section 1 using Figure 4.1 on
page 4-3 to determine the maximum current allowed(approximately).
– 80m (3.59A)
Important: If the total current in the section exceeds the
maximum current, move the power supply closer to theend and repeat steps 4-6 until the total current in the sectionis less than the maximum allowable current.

Results

Since the total current does not exceed the maximum current, section 1 will
operate properly (2.25A <3.59A).
Loading is 63% (2.25/3.59).
7. Determine the length of the middle section (section 2).
– 274m8. Add each device’s current together in section 2.
– 1.50+2.00 = 3.50A
9. Find the value next largest to the length of section 2 using Figure 4.3 on
page 4-5 to determine the maximum current allowed (approximately).
– 280m (7.69A)
Important: If the total current in the section exceeds the maximum current,
move the power supplies closer together and repeat steps 7-9
until the total current in the section is less than the maximum
allowable current.

Results

Since the total current does not exceed the maximum allowable current,
section 2 will operate properly (3.50A< 7.69A).
Loading is 46% (3.50/7.69).
If the middle section is still overloaded after you move the power supplies
closer together, add a third power supply. Then recalculate each segment.
Important: Section 1 + Section 2 + Section 3 = 7.3A. This is >4A and does
not comply with the NEC/CECode for Class 2 installations.
ODVA 2002

4-18

Determine Power Requirements

Important: To determine spare capacity for future expansion, subtract theactual current from the maximum allowable current. To
determine the percentage loading for each segment, divide themaximum allowable current into the actual current.

Use the Full-calculation
MethodSegment

Maximum
Current - Actual
Current =Spare Capacity

1

2.85A - 2.25A=

0.60A

79% (2.25A/
2.85A)

2

3.83A - 3.50A=

0.33A

91% (3.50A/
3.83A)

3

1.70A - 1.55A=

0.15A

91% (1.55A/
1.70A)% Loading/
Segment

Use the full-calculation method if your initial evaluation indicates that one
section is overloaded or if the requirements of your configuration cannot be
met by using the look-up method.
Important: Before constructing the cable system, repeat all calculations to
avoid errors.

Using the Equation

A supply that is not end-connected creates two sections of trunk line.
Evaluate each section independently.
SUM {[(Ln x (Rc)) + (Nt x (0.005))] x In} < 4.65V

ODVA 2002

Determine Power Requirements

Term

Ln

4-19

Definition

L = The distance (m or ft) between the device and the power supply, excluding the drop line distance.
n = The number of a device being evaluated, starting with one for the device closest to the power
supply and increasing by one for the next device. The equation sums the calculated drop for eachdevice and compares it to 4.65V.

Rc

Thick cable
Metric 0.015 Ohms/mEnglish 0.0045 Ohms/ft
Mid cable
Metric 0.023 Ohms/mEnglish 0.0069 Ohms/ft
Thin cable
Metric 0.069 Ohms/mEnglish 0.021 Ohms/ft
Flat Cable
Metric 0.019 Ohms/mEnglish 0.0058 Ohms/ft

Nt

The number of taps between the device being evaluated and the power supply. For example:• when a device is the first one closest to the power supply, this number is 1
• when a device has one device between it and the power supply, this number is 2
• when 10 devices exist between the evaluated device and the power supply, this number is 11.
For devices attached to a multi port tap, treat the tap as one tap. The currents for all devices attached
to one of these taps should be summed and used with the equation only once.
For flat cable, Nt = 1 + twice the number of intermediate splice kits.

(0.005)The nominal-contact resistance used for every connection to the trunk line.

In

I = The current drawn from the cable system by the device.For currents within 90% of the maximum,
use the nominal device current. Otherwise, use the maximum rated current of the device. For
DeviceBox taps or DevicePort taps, sum the currents of all the attached devices, and count the tap
as one tap.
n = The number of a device being evaluated, starting with one for the device closest to the power
supply and increasing by one for the next device.

4.65V

The maximum voltage drop allowed on the DeviceNet trunk line. This is the total cable system
voltage drop of 5.00V minus 0.35V reserved for drop line voltage drop.

ODVA 2002

4-20

Determine Power Requirements

One Power Supply (End-Connected)
Example of Thick Cable
The following example uses the full-calculation method to determine theconfiguration for one end-connected power supply on a thick cable trunkline.
• Device 1 and Device 2 cause the same voltage drop but Device 2 istwice as far from the power supply and draws half as much current.
• Device 4 draws the least amount of current but it is furthest from thepower supply and causes the greatest incremental voltage drop.
power
supply

TR
TR PT

15m
(50 ft)30m(100 ft)

244m(800 ft)

122m(400 ft)

T

T

T

T

D1

D2

D3

D4

1.0A

0.50

0.50

0.25

TR = terminating resistor
PT = Power tap

T = T-Port tap
D = deviceTR

1. Find the voltages for each device using the equation for thick cable.
SUM {[(Ln x (0.0045)) + (Nt x (0.005))] x In} < 4.65V.
D1
1.0A

D2
0.50A

D3
0.50A

D4
0.25A

A.[(50 x (0.0045)) + (1 x (0.005))] x 1.00 = 0.23V
B.[(100 x (0.0045)) + (2 x (0.005))] x 0.50 = 0.23V
C.[(400 x (0.0045)) + (3 x (0.005))] x 0.50 = 0.91V
D.[(800 x (0.0045)) + (4 x (0.005))] x 0.25 = 0.91V
1. Add each device’s voltage together to find the total voltage.
0.23V + 0.23V + 0.91V + 0.91V = 2.28V

Results

Since the total voltage does not exceed 4.65V, the system will operateproperly (2.28V <4.65V).
The percent loading is found by dividing the total voltage by 4.65V.

ODVA 2002%Loading = 2.28/4.65 = 49%

Determine Power Requirements

4-21

One Power Supply (Middle-Connected)
Example of Thick Cable
This example is used to check loading on both sides of a middle-connectedsupply on a thick cable trunk line. Keep the loads, especially the higher ones,
close to the power supply. If the device location is fixed, put the power supply
in the center of the highest current concentration.

T

T

T

T

T

D3

D2

D1

D4

D5

D6

0.25A

0.25A

0.25A

0.25A

1.5A

0.5A

TR = terminating resistor
PT = Power tap

T = T-Port tap
D = device

According to the look-up method, section 1 is operational while section 2 is overloaded.
Value of

Section 1

Section 2

Total maximum
current

1.25A(approximately)

1.25A(approximately)

Total current required

0.75A

2.25A

1. Find the voltages for each device in section 1 using the equation for thickcable.
SUM {[(Ln x (0.0045)) + (Nt x (0.005))] x In} < 4.65V.
D1

A.[(100 x (0.0045)) + (1 x (0.005))] x 0.25 = 0.12V

0.25A

D2

B.[(400 x (0.0045)) + (2 x (0.005))] x 0.25 = 0.45V

D3

C.[(800 x (0.0045)) + (3 x (0.005))] x 0.25 = 0.90V

0.25A

2. Add each device’s voltage together to find the total voltage for section 1.
0.12V + 0.45V + 0.90V = 1.47V

ODVA 2002

4- 22

Determine Power Requirements

3. Find the voltages for each device in section 2 using the equation for thickcable.
SUM {[(Ln x (0.0045)) + (Nt x (0.005))] x In} < 4.65V.
D1

A.[(200 x (0.0045)) + (1 x (0.005))] x 0.25 = 0.23V

0.25A

D2
1.5 A

D3

0.5A

B.[(400 x (0.0045)) + (2 x (0.005))] x 1.5 = 2.72V
C.[(800 x (0.0045)) + (3 x (0.005))] x 0.5 = 1.81V
4. Add each device’s voltage together to find the total voltage for section 2.
0.23 + 2.72 + 1.81 = 4.76V
Since the total voltage in section 2 exceeds 4.65V, the system will not operateproperly (4.76V > 4.65V).

Results

Attempt to correct this overload by moving the power supply 91m (300ft)
toward the overloaded section. Now there are four devices in section 1 andtwo devices in section 2. Once you’ve moved the power supply, try thecalculations again.
power
supplysection 1
335m(1100 ft)

213m
(700ft)152m(580 ft)

122m(400 ft)
30m(100 ft)

30m(100 ft)

TR

T

T

T

T

D4

D3

D1

0.25A

0.25A

D2
0.25A

TR = terminating resistor
PT = Power tap

section 2

0.25A

PT

T

T

D5
1.5A

D6
0.5A

TR

T = T-Port tap
D = device

1. Find the voltages for each device in section 1 using the equation for thickcable.
SUM {[(Ln x (0.0045)) + (Nt x (0.005))] x In} < 4.65V.
D1
0.25A

D2
0.25A

D3
0.25A

D4
ODVA 2002

0.25A

A.[(100 x (0.0045)) + (1 x (0.005))] x 0.25 = 0.11V
B.[(400 x (0.0045)) + (2 x (0.005))] x 0.25 = 0.45V
C.[(700 x (0.0045)) + (3 x (0.005))] x 0.25 = 0.79V
D.[(1100 x (0.0045)) + (4 x (0.005))] x 0.25 = 1.24V

Determine Power Requirements

4- 23

2. Add each device’s voltage together to find the total voltage for section 1.
0.11 + 0.45 + 0.79 + 1.24= 2.59V
3. Find the voltages for each device in section 2 using the equation for thickcable.
SUM {[(Ln x (0.0045)) + (Nt x (0.005))] x In} < 4.65V.
D5
1.5A

A.[(100 x (0.0045)) + (1 x (0.005))] x 1.5 = 0.68V

D6

B.[(500 x (0.0045)) + (2 x (0.005))] x 0.5 = 1.13V

0.5A

4. Add each device’s voltage together to find the total voltage for section 2.
0.68 + 1.13 = 1.81V
Results

Since the total voltage does not exceed 4.65V in either section, the system
will operate properly - section 1 (2.59V < 4.65V)
section 2 (1.81V < 4.65V).
The percent loading is found by dividing the total voltage by 4.65V.
Section 1%
Section 2%

Loading = 2.59/4.65 = 56%
Loading = 1.81/4.65 = 39%

ODVA 2002

4-24

Determine Power Requirements

ODVA 2002

Chapter 5
Commissioning, Troubleshooting and
Diagnostics

Network Measurement
Tools

There are several different type of diagnostic and troubleshooting tools
available to aid you in the initial commissioning of the network, further
troubleshooting during operation and as an ongoing means of monitoring its
health. For a complete listing of the most recent diagnostic/troubleshooting
tools available see www.odva/products/diagnostics . The broadest categoryof tools are those which are general purpose such as a voltmeter, oscilliscope,time domain reflectometer, etc. These analytical tools can confirm
connections, verify cable lengths and the proper installation of terminations
as well as being able to measure voltages and confirm signal levels. This
category of tools requires a user with advanced knowledge of both themeasuring tool and the DeviceNet specification.
The second category of tools are protocol-specific and include a variety ofboth passive and active hand-held meters. Passive instruments are designed
to locate short circuits, opens, confirm terminations and cable lengths. Active
handheld devices are designed to give "dial in" measurements of the physicallayer voltages such as common mode voltage as well as data packet
characteristics such as node error count or rate and bandwidth utilization.
These protocol-aware measuring tools are more user friendly in that they
typically use plug-play network connections.
Lastly there are a variety of software tools available to monitor network traffic
which can aid in commissioning and diagnostics. For instance someconfiguration tools can monitor traffic and errors produced in the network.
More sophisticated software tools such as protocol analyzers parse out anddecode both CAN and DeviceNet messages to get into refined issues suchas device communications and timing. These tools require a higher level ofsophistication and are not designed specifically to address physical layer
issues.

Verifying Network
Installation

VERIFYING NETWORK INSTALLATION - Commissioning
the Network
Prior to making any measurements use the quick check list below to verify
that the physical media system has been installed and designed properly:•Total device network current draw does not exceed power supply current
limit

ODVA 2002

5-2

Commissioning, Troubleshooting and Diagnostics• Number of DeviceNetTM nodes does not exceed 64 on one network. The
practical limit of DeviceNetTM nodes may be 61 devices since you should
allow one node each for the scanner, the computer interface module, and an
open node at node 63.

• No drop should be greater than 6m in length (20 ft)• Cumulative drop line budget does not exceed the maximum allowable per
the network baud rate limit• Total network trunk length does not exceed the maximum allowable per the
network data rate and cable type

• Terminating resistors are on each end of the trunk line
• Ground V-, drain and (for round media) shield at only one location preferably
in the center of the network• Check the physical media prior to applying power– All connections are inspected for loose wires or coupling nuts
– Check for opens or shorts– Check the proper value of the terminating resistors

Confirming MediaCONFIRMING MEDIA TOPOLOGY AND CONNECTIONS
The following measuring procedures are suggested PRIOR tocommissioning your network:
1. Use a Time Domain Reflectometer, DVM or handheld network media
checker to verify cable lengths, cable types, termination and connection
integrity. These tests are to be conducted PRIOR to connection of devices
and power on the network.
2. Insure that both termination resistors are connected to the network.
Measure and record DC resistance between CAN_H and CAN_L at the
middle and the ends of the network.

ODVA 2002

Commissioning, Troubleshooting and Diagnostics

5-3

Measured Value

Action<50 Ohms

Check for short circuit between
CAN_H and CAN_L wiring
Check for more than two
terminating resistors
Check nodes for taulty trnasceivers

50-70 Ohms

Normal71-125 Ohms

Check for open circuits in CAN_H
and CAN_L wiring
Check for only one terminating
resistor>125 Ohms

Add termination resistors

3. Temporarily disconnect from ground and measure between ground andmeasure between ground and the disconnected grounding point.

Measured Value

Action<1 Megaohm

Check for additional grounded V- orshield wires>1 Megaohm

NormalRecord all of the above in the attached "Baseline and Test Report"
4.Measure the network’s electrical characteristics with the following as therecommended minimum to make and record:
A. Bus Power
B. Shield Voltage
C. Common Mode Voltage
Record all of the above in the attached "Baseline and Test Report"
5.After scanner(s) and any other connection originators have been configured
and are operating normally, measure network protocol characteristics withthe following the recommended minimum to make and record:
A. Network Error Rate
B. Error Counter
C. % Network Bandwidth
D. Network Message Rate/Sec
Record all of the above in the attached "Baseline and Test Report"
ODVA 2002

5-4

Commissioning, Troubleshooting and Diagnostics

Proper Network
Maintenance

PROPER NETWORK MAINTENANCE
Once the network has been installed and has been successfullycommissioned and baseline measurements recorded, periodic
measurements can improve network availibility. The most obvious place tobegin this checkup is by comparing the network’s operating characteristics
against the established baseline. Checkup frequency and thoroughness isthe key to early detection of deteriorating network properties. A continuous
monitoring of these baselined parameters is ideal, however, a quick
protocol-aware checkup every few weeks would be adequate to detect any
deteriorations of network performance.

ANALYZING SYMPTOMS
Use the following to analyze the most common symptoms and their likely
sources.
Most devices have LEDs, some have alphanumeeric or other displays. If anyof these show error codes or messages, read the manufacturer’s data sheets
to intrepret the codes.

Common Mode Problems

SYMPTOMS:
1. Nodes at the end of the trunk stop communicating after operating normally
2. The network communicates only when the number of nodes is decreasedor the trunk length is reduced
3. Properly configured slaves are not detected by the scanner
CHECKS:– Check the communications at the end of the network.
– Check the common mode voltage.
SUGGESTED ACTIONS:– Move nodes from overloaded section to less overloaded section– Shorten the overall length of the network cable– Move power supply in direction of the overloaded section of the
network– Move high current nodes (e.g. valve banks) close to the power supply– Add second power supply
ODVA 2002– Break network into two (2) separate networks

Commissioning, Troubleshooting and Diagnostics

Bus Errors

5-5

Bus Errors
SYMPTOMS:
1. Nodes intermittant-they drop off suddenly and unexpectantly
2. LEDs or other displays indicate “buss off” errors.
CHECKS:– Use protocol-aware tool to measure bus error rate.
SUGGESTED ACTIONS:– Node baud rate set incorrectly affects other nodes when it attempts to
go online– Replace suspected faulty device and re-check error rates– Intermittent cables - check by shaking/bending/twisting the suspectedcable or connection while looking at the error rates

Bus Traffic Problems

Bus Traffic Problems
SYMPTOMS:
1.Nodes stop communicating and devices time out. No communication froma device
CHECKS:– Check bandwidth using protocol-aware device
SUGGESTED ACTION:– Check scanner configuration as scan rate may be set incorrectly– Inter-scan delay/scan interval too short can cause device timeouts– Inter-scan delay/scan interval too long can reduce system
performance and makes inefficient use of available bandwidth– Check Change-of-State devices consuming excessive bandwidth-increase production inhibit time or change these devices to poll,
strobe or cyclic communications.
– Look for nodes with excessive bandwidth or much higher than
average MAX value

ODVA 2002

5-6

Commissioning, Troubleshooting and Diagnostics

Bus Power Problems

Bus Power Problems
SYMPTOMS:
1.Nodes near end of trunk stop communicating after opearting normally
2.Network communicates only when the number of nodes is reduced or thetrunk length is reduced
CHECKS:– Check network power voltage at the node and the common mode
voltage at the ends of the network
SUGGESTED ACTIONS:– ·Check for output devices (eg contactors) powered from the network– ·Check for network cables routed too close to interferences from highvoltage and RF lines– ·Check power supply ripple increasing over time against the baseline– ·Intermittant cables check by shaking/bending/twisting the suspectedcable or conenctor while watching the peak-peak voltage changes

Shield Voltage Problems

Shield Voltage Problems
SYMPTOMS:
1. Nodes intermittantly dropping out.
2. properly configured slaves are not detected by the scanner.
CHECKS:– Check shield voltage
SUGGESTED ACTIONS:– Check for additional V- or shield wire connections.
– Check for loose connections, especially field attachable connections– Make sure only shield and V- connected together at earth ground andthe power supply

ODVA 2002

Commissioning, Troubleshooting and Diagnostics

Common Faults

5-7Common Faults
If you are having difficulty with the network make sure to check the following
most common network problems :– More or less than two (2) terminators– Relaxed connector pin - especially those which use a soft brasscontact on the female socket. The DeviceNetTM specification requiresthat connectors are good for at least 1000 insertions.
Phosphor-Bronze contacts are more likely to meet this requirement.
– Excessive drop line cable length– Too many drop cables - cumulative drop length– Excessive trunk line length - especially with THIN cable– Improper shield and ground connection at the power supply– Shorts and opens in manually-wired connectors– Failure to perform power distribution calculations for new installations
and again when adding nodes i.e your power budget has been
exceeded– Using a typical device current rather than maximum current for power
distribution calculations– Scan interval configured faster than the network can handle

Flat Cable Shorts

Flat Cable Shorts
Badly installed flat cable taps can cause short sircuits. These can bedifficult to find because the taps are not designed to allow removal. A time
domain reflectometer or handheld network media checker can indicate theapproximate distance to a short. This may not be accurate enough if there
are several taps within a short distance of each other. The following
technique can be used to identify the shorted tap more precisely.
Disconnect all devices by removing all of the snap-on connection interfaces.
Use two open-style connection interfaces for the test. Use one of these to
inject about 100mA DC into the shorted pair of conductors. Use the otherwith a multimeter to measure mV across the shorted pair. Move themeasurement point to different taps - the voltage should decrease as it getsnearer to the short. If you see no change, the short is probably on the otherside of the current injection point. If you see no change on either side, theshort is probably at the current injection point. Move the current injection
point to another tap and repeat the test. The lowest voltage measured should
be at the shorted tap.

ODVA 2002

5-8

Commissioning, Troubleshooting and Diagnostics

The 100mA current can be generated by a low-voltage DC power supply anda resistor. Be careful if using the 24V DC network supply for this - the resistor(240 Ohms) would dissipate 2.4 watts and would get hot. It should have atleast a 5 watt rating. It is better to use a 1.5V cell and a 15 Ohm resistor,
which will only dissipate about 0.15 watts.
Once the shorted tap is identified, the flat cable must be cut on either sideand the faulty tap removed. Use a splice kit to repair the cable. The splice
kit consists of two taps with end caps for sealing, and two connection
interfaces permanently joined by a short length of cable.
Never attempt to re-use a flat cable tap.

ODVA 2002

Appendix

A

Understanding Select NEC Topics

What’ s in this Appendix

Be aware that the following topics from the National Electrical Code (NEC)725 (revision 2002) impact the configuration and installation of DeviceNet
systems in the United States. There also may be additional NEC sections
and local codes that you must meet. Other codes exist outside of the UnitedStates that may also affect your installation.

Class 1 (CL1) Cable
Per NEC specifications for a Class 1 circuit (see NEC Article 725), theenergy in the circuit anywhere is limited to 1000 VA. A Class 1 circuit
requires that the cables used must have jacketing with 600V isolation andpass the CL1 burn test.
DeviceNetTM specifies the power source to be a regulated maximum of 24V
dc and the power circuit is limited to 8A. Applying this to a Class 1 circuit
running at 24V dc, a DeviceNetTM certified cable with a 600V jacket
isolation rating meets all requirements to be used in a Class 1 circuit. So,
based on DeviceNetTM specification, the cable’s power carrying conductors
are sized for an 8A maximum load.

Class 2 (CL2) Cable
Per NEC specifications for a Class 2 circuit (see NEC Article 725), theenergy in the circuit anywhere is limited to 100 VA and the cable’s jacketingused must have a 300V minimum isolation rating. Based on a 30V dc
system your circuit would be limited to 3.3A.
DeviceNetTM specifies the power source to be a maximum of 24V dc.
Applying this to a Class 2 circuit running at 24V dc, the maximum allowablecurrent is 4A. A DeviceNetTM certified cable with a 300V jacket isolation
rating meets all requirements to be used in a Class 2 circuit. So, based on
the DeviceNetTM specification, the cable’s power carrying conductors, aresized for a 8A maximum load.

ODVA 2002

A-2

Understanding Select NEC Topics

Suppliers of DeviceNetTM physical components use the above information toprovide components you can use to cable DeviceNetTM systems
The DeviceNetTM specifications provide for both “open and closed style”
wiring terminations. You can engineer a wiring system for a DeviceNetTM
installation that lays out a trunk line in accordance with the requirements of
the Class 1 guidelines and uses drop lines in accordance with Class 2
guidelines. Care must be taken at the point where the two guidelines meet.
At that point you must put in place a way to limit the energy on each wire to
be in accordance with the NEC guidelines. In short, the energy in the dropline must be limited to no more that 100 VA. How you accomplish that is yourdecision. Most people resolve this issue by isolating the trunk from the dropline with different power sources. Other ways to limit energy may give you
the same protection.

Specifying Article 725
TopicsRound (Thick, Mid & Thin) and Class 2 Flat Media• power limitations of Class 2 circuits– The power source for Class 2 circuits must be either inherently limited,thus requiring no overcurrent protection, or limited by a combination of
a power source and overcurrent protection.
• marking– Class 2 power supplies must be durably marked where plainly visible
to indicate the class of the supply and its electrical ratings.
• interconnection of power supplies– Class 2 power supplies must not be paralleled or otherwiseinterconnected unless listed for such applications.

Class 1 Round or Flat Media• power limitations of Class 1 circuits– The overcurrent protection shall not exceed 10 amperes per NEC
article 725-23.
– Consult the product manufacturer to determine if the device is suitablefor installation with a Class 1 power source.

ODVA 2002

Appendix

B

Powering Output Devices
Wide Available Voltage
Range

You can power some output devices on the DeviceNetTM network. The

application must allow the voltage to remain within the DeviceNetTM
specification limits of 11-25V dc. Most actuators need to be powered by aseparate power supply. They usually require more power than is practicallyavailable from DeviceNetTM. Also, the large voltage variation of 11-25V that
DeviceNetTM allows is typically beyond the range that most available
actuators or output devices can safely operate over.
You can use DeviceNetTM power to operate output devices such as
hydraulic and pneumatic solenoid valves, pilot and stack lights, and motor
starter coils with the following caution:!

ATTENTION: Do not let DeviceNetTM voltage at the relevant
node exceed the output device’s acceptable voltage range.
Output devices rated 24V dc rarely are specified to operate
below 19.2V dc or -20% of their 24V dc rating. Many only
operate down to 20.4V dc or -15% of the rated voltage. Thismeans that the DeviceNetTM network design must not allow theavailable voltage to drop below 19.2 volts, for example, insteadof the 11 volts that the DeviceNetTM specification allows. Thishigher lower voltage limit which is within the DeviceNetTM
specification will actually restrict the distance of theDeviceNetTM network from what would be possible if actuators
were not utilizing the DeviceNetTM power

Important: Design your network to make sure that sufficient voltage isavailable to operate the output device wherever it is installed.
This is especially important when it is connected at the farthest
location from the power supply.
The DeviceNetTM common mode drop voltage specification limit of 10 volts,
5 volts in each power supply V+ and V- conductor, will never be a concern.
This is because in the design process we start with a 24V dc power supply
and allow for the 4% stack-up tolerance which leaves 23V dc to work with.
From here we consider the output device’s minimum required operating
voltage of 19.2 volts. This gives 23V dc-19.2V dc = 3.8V dc for the common
mode voltage or 1.9V dc in each conductor. This is far more restrictive than
the 5 volts of the DeviceNetTM specification and will result in shorter
allowable distances for the installation.
ODVA 2002

B-2

Powering Output Devices

Noise or Transient
Protection

The typical actuators used in DeviceNetTM control systems utilize inductive
coils that generate transients when de-energized. You must use appropriate
protection to suppress transients during coil de-energization. Add a diodeacross the inductive coil to suppress transients on the actuator’s dc coils.
Use a MOV varistor module suppressor for a 24V dc coil if the added dropout time with the diode is unacceptable. This varistor module must clamp
the transient voltage across the coil at 55 volts to prevent the output contactfrom arcing on switch separation. Read the output device’s specificaitons. It
may have more restrictive transient suppression requirements than statedherein (lower maximum voltage).
Typical actuators used in DeviceNetTM control systems use inductive coils
and limit current transients on energization by their inherent L/R time
constant. Any transients due to contact bounce on energization will be
suppressed by the transient protection utilized for coil de-energization.

!

ODVA 2002

ATTENTION: Do not use DeviceNetTM power to actuate dc
coils that use economizing coils to operate. These coils havehigh inrush currents.

Appendix

C

DeviceNet Baseline & Test Report
Tested By:

CompanyPhone

e-mail

Measurement Date

Measurement Time

Network Identification

Network Location (Company name & Address)

Network Characteristics
Single Master # ___Multi Master # ___, ___, ___, ___Single power supply

Multiple power supplies (No. ___)

125 Kbaud

250 Kbaud

500 Kbaud

Network uses Thick media

Network uses Thin media

Network uses Mid media

Network uses Flat media

Trunk checked for short circuit

Trunk checked for opens

Wiring of trunk checked

Drops checked for opens

Check termination values

Shield and V- connected to ground at single point on network-at power supply

Media Testing
Drops checked for short circuit

Node List (According to network administrator, or “Network Who” scan)
0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

Basic Observations & Symptoms
Reported Symptoms
No problems reported

Intermittent problems (___ min, ___ hrs, ___ days)

All nodes affected

Some nodes affected

Error codes:

Error codes per nodeConstant problems

Node Network Status LEDs (LED indications refer to Network Status or Combined Module/Network Status LEDs)
All nodes active (green)

Some nodes active (green)

Some nodes inactive (blink green)

Some nodes faulted (red)All nodes occasionally inactive (green/ blink green)

Some nodes occasionally inactive (green/ blink green)

All nodes with no power (LED off)

Some nodes with no power (LED off)

C-2

DeviceNet Baseline & Test Report

Physical Layer Measurements ( NetMeter TM DeviceNet Detective
Multimeter
Oscilloscope Connected to network
in proximity to node # ___). Use NetMeter to take all of the following measurements (NetMeter switch positions are shown
beside each measurement). You can also collect a limited number of measurements using other tools such as the(indicated by icons in the table).
DeviceNet Detective , multimeter and/or oscilloscope
Note: This document shows some measurements that are only practical with specific proprietary test instruments. All
measurements are theoretically possible with general-purpose instrumentation such as oscilloscopes, but some would bevery tedious. Proprietary instruments make it easy to perform the tests for which they are designed. This page indicates
instruments that are believed to have such capabilities, but you should NOT assume that it is complete or accurate. Consult
the instrument manufacturers for more information about each instrument’s capabilities.
Autosearch Results (record measurements as indicated by NetMeter Autosearch function and check for and/orwith each reported problem)
No faults found ☺
NetMeter gathered data for (H:M:S) ___:___:___ before
Measurement

Min

Max

Measurement[2] Bus error rate (/S)[4] Bus power, DC (V)[3] Bus traffic, bandwidth(%)Bus power, P-P (V)[4][5] Shield Voltage (V)[6] Common Mode Voltage[7] CANH/L Recessive Diff.
(V) CANH Recessive (V)[9][8] CANH/L Dominant Diff.
(V) CANH Dominant (V)[10][11] CANL Recessive (V)[12] CANL Dominant (V)

Min

Max

Overall Subnet Measurements (only important for baseline performance, or for more detail if NetMeter Autosearch
indicates problems)
Measurement[2] Bus error rate (/S)“Live”MinMax

Measurement[2] Bus error count[3] Bus traffic, bandwidth (%)[3] Bus traffic, message rate (/S)[4] Bus power, DC (V)[4] Bus power, P-P (V)[5] Shield Voltage (V)[6] Total Common Mode Voltage[7] CANH/L Recessive Diff. (V)[8] CANH/L Dominant Diff. (V)[9] CANH Recessive (V)[10] CANH Dominant (V)[11] CANL Recessive (V)[12] CANL Dominant (V)Measurement
CAN_H average (V)CAN_L average (V)Network idle

“Live”MinMax

Network active (normal operation)“Network idle” means all scanners and other connection originators inactive, disabled or disconnected. In this state theaverage voltages should be the same, about 2.5 – 3.5 volts. This will vary with position on the network. Repeatedmeasurements should be taken at the same point for valid comparisons. With network active you are using a DC meter tomeasure a complex high frequency waveform, so these measurements are only approximate. Different meters may givedifferent results. Repeated measurements should be taken with the same instrument at the same point for valid
comparisons. CAN_H average should be about 0.5 – 1 volt higher than when idle. CAN_L average should be about thesame amount lower than when idle. Because multimeters are not intended for this sort of waveform it is possible that theymight cause errors on an active network. Experience suggests that this is rare with modern, high-impedance instruments,
but if you experience this problem or are concerned about the possibility, construct a pair of probes with 100 kOhm resistors
and heat-shrink sleeving. This is much higher than the network impedance (so it can’t significantly affect the network) andmuch lower than the meter impedance (so it does not introduce a significant error).

DeviceNet Baseline & Test Report

C-2

Per-node Measurements (only important for baseline performance or for more detail if subnet measurements indicate problems).
Node
Number[2] Bus error rate (/S)“Live”MinMax[2] Bus error count[3] Bus traffic, bandwidth utilization (%)“Live”MinMax[3] Bus traffic, message rate (/S)“Live”MinMax

™

IndexNumerics
10-pin linear plug 1-6
5-pin linear plug 1-6

A
adequate power
worst case scenario 4-1
adjusting the configuration 4-13
auxiliary power cablediagram 3-11
installation 3-11Ccable installation
Flat cable 3-6
cable position
Flat cable 3-8
cable preparation 3-1
cablesmaximum distance 1-3
determining 1-3
preterminatedthick 2-11
thin 2-11
CECodecurrent boost configuration
example 4-14
circuitClass 2
limitations A-2
power source A-2
class 1
Flat cabletotal allowable current 1-10class 1 applications
Flat cable rating A-1
class 1 cablemaximum load A-1
NEC specifications A-1
class 2
total allowable current A-1
class 2 cablemaximum load A-1
NEC specifications A-1
common mode drop voltage
DeviceNet B-1
communication rate 1-3
determining 1-4
components
flat media network diagram 2-1
components diagram 2-1
conductors
V- 1-11
V+ 1-11, 4-14
configuration
adjusting 4-13
NEC/CECode current boost 4-14
one power supply end connected look-up method 4-11
middle connected 4-12

C (Con't)connecting
drop lines 3-5
power supplies 3-11
to a Multi port tap preterminated thin cable
stripped conductors to micro female 2-12
stripped conductors to mini female 2-12
to a T-Port tap from open device preterminated thin cablemini male to conductors 2-12
to a T-Port tap from sealed device preterminated thin cablemini male to micro female 2-11
mini male to mini female 2-11
to the trunk line via direct connection 2-5
to the trunk line using connectors
open-style 3-2
sealed-style 3-3
to flat cable micro T-Port tap 2-10
connectors
Flat cable
IDC’s 2-10
installation 3-6
open-styleattaching to trunk line 3-2
fixed 3-5
pinouts 3-11
sealed-styleattaching to trunk line 3-2
micro-style 1-6, 3-3
mini-style 1-6, 3-3
conventions used in manual P-2
current
boost example 4-14
cable system
maximum 4-18
maximum allowable
one power supply (end connected) example 4-11
one power supply (middle connected) example 4-12
segment between two power supplies figure 4-10
two power supply (end connected) example 4-15
two power supply (not end connected) example 4-15
maximum drop line 1-10
equation 1-10
name plate setting 1-12
thick cable 1-10
thin cable 1-10
current chartend segment
two power supplies round cable thick 4-7
one power supply
end segment
flat cable 4-4
round cable mid 4-9
round cable thin 4-10
two power supplies
end segment flat cable 4-8
flat cable 4-6
round cable thick 4-5

IndexD (Con't)D
definition
open-style connector
fixed 1-5
plug-in 1-6
sealed connector
micro-style 1-6
mini-style 1-6
terminating resistor 1-7
definitions
flat cable 1-2
power supply formulas 4-18
thick cable 1-2
thin cable 1-2
determining adequate power
power usage 4-3
DeviceNet common mode drop
voltage B-1
DeviceNet power
economizing coils B-2
high inrush currents B-2
DeviceNet
powering output devices 4-1
DeviceNet voltage limits
output power B-1
diagramauxiliary power cable 3-11
end cap installation
flat cable 3-12
flat cable 3-6
flat cable connector installation 3-6
flat cable connectors 2-10
diagrams
components 2-1
multi port tap 2-7
direct connection 2-9
Power tap 2-5, 2-7,3-11preterminatedthick cable 2-11
thin cable 2-11
connecting to T-Port tap 2-11
thick cable 2-2
mid cable 2-3
thin cable 2-3
T-Port tap 2-5
diodesdrifttemperature 1-9time 1-9
drop cableflat cable installation
open-style 3-9
drop line
allowable current 1-10
connection types
open-style
hard-wire screw terminals 3-5
pluggable screw connectors 3-5
soldered 3-5
sealed-style
quick disconnect connectors
cumulative length 1-4
definition 1-4
determining communication rate 1-4
current 1-10
equation 1-10
including as part of cable length 1-4
rating 1-10Eeconomizing coils
DeviceNet power B-2
end cap installation 3-10
end segment current chart
two power supplies
round cable (thick) 4-7
endcapflat cableterminating resistor 1-8
equationcurrent 1-10
equation 1-10
including as part of cable length 1-4
rating 1-10
examples
NEC/CECode current boost configuration 4-14
power supplyone
end connected 4-11, 4-20
end segment 4-10
middle connected 4-12, 4-20
twotransient protection B-2
direct connection
connecting to trunk line 2-4
description 1-5, 2-9
diagram 1-5, 2-9
open-style 2-5, 2-9
zero-length drop 1-5
distanceend connected 4-15
not end connected 4-16

F
figures
power supply
two segment between 4-10
fixedconnector open-style 1-5

maximum cable 1-4
determining 1-4

IndexF (Con't)
flat cableclass 1
total allowable current 1-9
definition 1-2
size 1-2
total allowable current
class 2 1-9
use of connectors
flat cable 2-11
wire contents 1-3
flat media
network diagram 2-1
full-calculation method
description 4-18
equations 4-18
examplespower supplies - oneend connected 4-19
middle connected 4-20
full-calculation method 4-18

G
grounding 1-16, 4-14
guidelines
supplying power 1-9

H
hard wire taps
installing
multi port tap 3-4
Power tap 3-4
high inrush currents
DeviceNet power B-2
hydraulic solenoid valves
output power B-1

I
IDC’sflat cable connectors 2-10
installation
auxiliary power cable 3-11
flat cableend cap 3-11
flat cable connector 3-6
flat cable open-style
drop cable 3-9
open-style connectors 3-2
pluggable screw-connector 3-2
installing
multi port tap 3-5
hard wire taps
multi port tap 3-4
Power tap 3-4
power supplies 3-11
Power taps 3-4

K
keying information
T-Port tap 2-6

Lline regulation 1-9
linear plug
10-pin 1-6
5-pin 1-6load regulation 1-9
loading
percentages 4-23
look-up method
configuration
one power supply end connected 4-12
examples
NEC/CECode current boost
configuration 4-14
power supplyone
end connected 4-11
middle connected 4-12
twoend connected 4-15
not end connected 4-16
figures
power supply
one
middle segment 4-12
making system operational 4-13

M
maximum current% loading/segments
table 4-18
network length
one power supply
flat cable 4-5
round cablethin 4-10
two power supplies 4-6
end segment
flat cable 4-9flat cable 4-7
maximum loadclass 1 cable A-1
class 2 cable A-1
minimum name-plate current rating single power supply 1-9
minimum required operating voltage output devices B-1
motor starter coils output power B-1

NNEC
about P-2
Class 2 A-1
current boost configuration
example 4-14
section 725 A-1
NEC regulations power conductors A-1

IndexN

P

NEC specificationsclass 1 cable A-1
class 2 cable A-1
NEC/CECode current boost
configuration 4-14
NEMA rating

parallel application
power supplies 1-9
plu 10-pin 1-6
installation 3-2
plug-inconnector

flat cable terminating resistor
sealed 1-7
unsealed 1-7
network length
maximum current
end segment
two power supplies round cable (thick) 4-7
one power supply flat cable end segment 4-4
round cable thin 4-10
two power supplies 4-6
flat cable 4-8, 4-9
noise or transient protection
output power B-2
noise protection
powering output devices 4-1

Oopen-style 1-5
pneumatic valves
output power B-1
power
determining
using look-up method 1-12, 4-3
limitations A-1
power cablediagramflat cable 3-11
flat cableinstallation 3-11
power conductors
NEC regulations 4-2
power supplies
adjusting 4-13

one power supply
configuration
middle connected 4-12
current chartend segment round cable thin 4-10

choosing 1-8
Class 2 A-1
connecting 3-12
initial setting 1-8
marking A-2

open device
connecting to flat cable micro T-Port tap 2-12

multiple

open-styleone

connector

parallel applications 1-9
end connectedattaching to trunk line 3-2

example 4-11, 4-19

fixed 1-5, 2-5, 3-9
hard wire 3-9

rating 4-11
middle connectedplug-in 1-5, 2-5, 3-9

example 4-12, 4-20

open-style connectors
installation 3-2
open-style flat cableinstallation
drop cable 3-12
output device
relevant node
voltage range B-1
output devices
minimum required operating voltage B-1
powering B-1
output power
hydraulic solenoid valves B-1
motor starter coils B-1
noise or transient protection B-2
pneumatic valves B-1

rating 4-12
twoend connected
example 4-15
not end connected
example 4-16
segment between 4-10
power supply
current chartend segment
flat cable 4-5
rise time 1-9
power usage
determining adequate power 4-1

IndexP (Con't)
powering output devices B-1
DeviceNet power supply 4-1
noise protection 4-1transient protection 4-1
Power tap

R (Con't)
single power supply
minimum name-plate current 1-9
spool size
thick cable 2-2
thin cable 2-3

description 2-7
diagram 2-7, 3-6
installing 3-4
NEC/CECode current boost
configuration 4-14

supplying power
guisystemcurrent 4-18
making operational 4-13

schematic 2-7

T

preparing cables 3-1

table

preterminated cables

maximum current

thick cable 2-11
thin cable 2-11
connecting to a multi port tap% loading/segments 4-18
taps
multi port 2-7

stripped conductors to micro female 2-12

diagram 3-5

stripped conductors to mini female 2-12

installing 3-5

connecting to a DevicePort tap

hard wire

micro male (90) to micro female 2-12

multi port 3-4

micro male (90) to mini female 2-12

installing 3-5

connecting to a T-Port tap

Power tap 3-4

mini male to micro female 2-11

PowerTap 2-6

mini male to mini female 2-11

diagram 3-4

R

installing 3-4

rating

NEC/CECode current boost configuration 4-14

drop line 1-10
thick cable 1-10
regulationline 1-9load 1-9
relevant node
output device
voltage range B-1
resistancenominal contact 4-18
resistor connection verification 1-5
resistors
usage definition 1-4
rise time
power supply 1-7
round cable

T-Port 2-6
connecting to 2-12
temperature drift 1-9
terminating
trunk line 1-3, 2-4
terminating resistor
endcap flat cable 1-8flat cable definition 1-7
round cable definition 1-7
usage definition 1-7
terminating resistors
flat cable/encap 1-8
thick cablecurrent 1-10
definition 1-2
description 2-2

wire contents 1-2

diagram 2-2

Spreterminatedsealed device
connecting to flat cable micro T-Port tap 2-13
sealed-styleconnector

description 2-11
diagram 2-11
rating 1-10
size 1-2

attaching to trunk line 3-3

spool size 2-2

micro-style 1-5, 3-3

total allowable current 1-10

mini-style 1-5, 3-3

IndexT(Con't)thin cableU
unsealed terminating resistor

current 1-10

flat cabledefinition 1-2

NEMA rating 1-8

description 2-3

V

diagram 2-3

voltagepreterminatedconnecting to a multi port tap
stripped conductors to micro female 2-12
stripped conductors to mini male 2-12
connecting to a DevicePort tap
micro male (90) to micro female 2-12

maximum drop 1-11, 4-18
range 1-10
voltage limits on DeviceNetTM
output power B-1
voltage range
output device

micro male (90) to mini female 2-12
connecting to a T-Port tap
mini male to micro female 2-11

relevant node B-1
wide DeviceNet 4-1

Wmini male to micro male (90) 2-11

wide DeviceNet voltage range 4-1

mini male to mini female 2-11

wide range voltage B-1

description 2-11
diagram 2-11
size 1-2
spool size 2-3

worst case scenarioadequate power 4-3

Zzero-length drop 1-5time drift 1-8
total allowable current
class 1flat cable 1-9
thick cableclass 2 flat cable 1-9
T-Port tap
connecting to 2-12
description 2-5
diagram 2-5
keying information 2-5transient protection
diodes B-2
powering output devices 4-1
trunk line
attachingconnectors
open-style 3-2
sealed-style 3-3
connecting to via direct connection 2-5
maximum cable distance 1-3
terminating 1-4, 2-4
two power supplies
current chartend segment
flat cable 4-8
round cable
thick 4-6

© Copyright 2002-2003, ODVA. All rights reserved.
DeviceNet™ is a trademark of ODVA.