8400100.qxp

3/20/2006

3:17 PM

Page 60

900MB

SeriesAnalog Output Module

Modbus/RS-485

Four
AnalogOutputs

Outputs (2)DC Currentor
DC Voltage

Four
DiscreteOutputs

Outputs (4)Isolation

RS-485

Modbus10-36V DCor 24V AC

PowerBusWorks® Modbus I/O

Outputs (2)917/918MB
Multi-Channel
Analog Output
Modules
DC Current or
DC Voltage Outputs
Discrete Outputs
Models
917MB: 4 current output channels
918MB: 4 voltage output channels
Analog Output
917MB: 0 to 20mA, 4 to 20mA, 0 to 1mA DC
918MB: 0 to 10V, 0 to 5V, 0 to 1V DC
Discrete Output
Four output channels:Open-drain MOSFETs (1A DC loads)
0 to 35V DC
Network Communication
Modbus-RTU high-speed RS-485
Power Requirement
12 to 36V DC (917MB), 10 to 36V DC (918MB),
24V AC■ Description■ Special Features

These modules drive four analog output channels
and also feature four discrete outputs for on/offcontrol. Isolation separates the output, power,
and network circuits. Network communication
adheres to the industry-standard RS-485 Modbus
RTU protocol. AC and DC power sources aresupported with nonpolarized, diode-coupledterminals.

■

Standard Modbus RTU protocol with high-speed
RS-485 communication (up to 115K bps)■

12-bit D/A yields 0.1% of span resolution andaccuracy■

Four analog outputs in an inch-wide module
reduces system costs and saves panel space■

Four discrete outputs enable host-controlled
on/off switching■

Heavy-duty 1A solid-state relays provide
dependable on/off control of industrial devices■

Self-calibration lowers maintenance costs by
reducing periodic manual calibration checks■

Watchdog timers provide a configurable
failsafe output state for use when hostI/O communication is lost■Three-way isolation eliminates potential
ground loops between power, output, andnetwork circuitry■

Self-diagnostics monitor microcontroller activity
to detect operational failures (lock-up) and
execute a reset to restore communication

The analog outputs generate a signal based oncommunication from the host. They accommodate wide DC voltage or current ranges.
Discrete outputs provide simple on/off switchingcapability (open-drain) for external devices.
Combining analog outputs, on/off controllers,and a network interface in a single package,
makes this instrument extremely powerful.
Multi-channel design adds cost-efficiency andallows high-density mounting. Plus, safe, rugged
construction make it reliable for both control
room and distributed field I/O use in a broad
range of temperature control applications.
Custom module configurations are also possible(consult factory for details).

Approvals
CE marked. UL, cUL listed
Class I; Division 2; Groups A, B, C, D.

Tel: 248-295-0880 e-mail: sales@acromag.com www.acromag.com
8401-003

8400100.qxp

3/20/20063:18 PMPage 61

ModbusI/O■ Performance■ Voltage Output (918MB)

Output Response Time

■ General Analog Output

DC Voltage Output Ranges
Range user-configured. Selection applies to all channels.
Output Range
Resolution Accuracy (% span)
0 to 1V
0.274% ±0.6% (±6mV)
0 to 5V
0.055% ±0.1% (±5mV)
0 to 10V
0.027% ±0.1% (±10mV)

4.1ms typical, from receipt of command to gate
transition of the output MOSFET.

Resolution
See current/voltage output specifications for more
information.

Ambient Temperature EffectOutput Impedance

LED Indicators

1 ohm.

LEDs indicate power, status, and discrete level/alarm.

Output Short Circuit Protection■ Power and Isolation

Ambient Temperature

Integral Non-Linearity

11.255V DC typical.
±0.1% of span or ±2 LSB typical, whichever is larger,
for spans equal to or greater than 5V.

Output Current

DC Current Output Ranges
Range user-configured. Range selected applies to allchannels.
Output Range
Resolution Accuracy (% span)
0 to 1mA
0.554% ±2.0% (±0.002mA)
0 to 20mA
0.028% ±0.1% (±0.02mA)
4 to 20mA
0.035% ±0.1% (±0.02mA)

Included.

Power Requirements

Response Time110µs rise time typical, 150µs fall time typical,
unloaded, for output to reach 98% of the final value
in response to a step command. Time varies with load.

Maximum Output Current

Four independent open drain MOSFET switches with acommon return that operate as low-side switches.

Output Voltage Range

Isolation

Output Type

Integral Non-Linearity±0.1% of span or ±2 LSB typical, whichever is larger,
for spans equal to or greater than 16mA.
12V minimum, 12.7V typical.

0 to 35V DC (up to 1A/channel continuous).
External voltage source required.

Output Load Resistance Range

Output ON Resistance

Output Compliance

0 to 630 ohms typical.

0.15 ohms maximum.

Response TimeOperation
Digital outputs are set to their OFF state following asoftware or power-on reset. Outputs may be set touser-defined states following a watchdog timeout.
Watchdog timeout output control takes precedence
over limit alarm control. Alarm control takes precedence over host control.

11ms typical into 500 ohms, for measurement toreach 98% of the final value in response to a stepcommand. Actual response time will vary with load.

Supply Current
Supply Current Draw (917)
10V DC Not Recommended
12V DC 275mA maximum
24V DC 120mA maximum
24V AC 210mA rms max.

■ Discrete Output

22.5mA DC typical.

10 to 36V DC (918MB), 12 to 36V DC (917MB)
22 to 26V AC.
Current Draw (918)100mA maximum
85mA maximum
45mA maximum
85mA rms max.

1500V AC for 60 seconds or 250V AC continuous.
3-way isolation between outputs, network, and power
circuits.

■ OrderingInformation
Models
917MB-0900918MB-0900
DC current (917MB) or voltage (918MB) output module

Accessories
TB1+
RTN

I3+

RTN

RTN

V2+
RTN
RTN
V3+
RTN
RTN

RTN
OUT1
OUT0

TB3

TB2

COMCOM
DDPWR

RTN

RTN

OUT2B
A

DIGITAL OUTPUTWIRING CONNECTIONSSAME AS 913/914MB

36 35 34 33 32 31

RTN

V1+

RS485

RTN

RTN

ANALOG OUTPUTSNETWORKCOMMUNICATION

TB3

RTN

I2+

21 22 23 24 25 26

RL

RTN

ANALOG OUTPUTS+TB2

TB1/TB2
V+

RTN

TB2
21 22 23 24 25 26

DC VOLTAGE OUTPUTANALOGOUTPUT

I1+

RTN
OUT3TB4TB1

RL

RTN

RTN

46 45 44 43 42 41

ANALOGOUTPUT

V0+

DIGITAL OUTPUTS

TB1/TB2
I+

TB4

TB1
11 12 13 14 15 16I

RTN

ANALOG OUTPUTS

11 12 13 14 15 16

DC CURRENT OUTPUT

I0+

ANALOG OUTPUTSANALOG OUTPUTCONNECTIONS

AC/DC
POWER
10 TO 36V DC
OR 24V AC
NON-POLARIZED

900C-SIP
Configuration Software Interface Package(includes software CD-ROM for Windows, RS-232/485
converter, and RS-485/three-wire cable)
4001-095
USB-to-RS232 adapter
TBK-B02
Optional terminal block kit, barrier strip style, 4 pcs.
TBK-S02Optional terminal block kit, spring clamp style, 4 pcs.
PS5R-VB24
Power supply (24V DC, 2.1A)

Tel: 248-295-0880 e-mail: sales@acromag.com www.acromag.com
8401-003

BusWorks® Modbus I/O

0 to 10mA DC maximum.

Maximum Output Voltage■ Current Output (917MB)

Supported Modbus Commands
The command/response protocol for communicatingwith this module adheres to the Modbus/RTU standard
for the following Modbus Functions.
Read Coil (Output) Status
Report Slave ID
Read Holding Registers
Reset Slave
Read Input Registers
Force Single Coil (Output)
Preset Single Register
Force Multiple Coils (Output)
Preset Multiple Registers

Better than ±0.001% of output span per °C, or±1.0uV/°C, whichever is greater.
Operation (917MB): -25°C to 60°C* (-13°F to 140°F*).
Operation (918MB): -25°C to 70°C (-13°F to 158°F).
Storage: -40°C to +85°C (-40°F to +185°F).
* Limit 917MB maximum ambient to 50°C (122°F)
when using supply voltages less than 15V DC.

■ Communication

8400100.qxp

3/20/2006

3:18 PM

Page 68

900MB

Series

900MB Series Technical Diagrams
TB4

TB3

Acromag

DFTBA

DDTB3

TB12.34(59.4)

BusWorks® Modbus I/O

PWR

TB22 3

CLRS485

3.75(95.3)

0 136 35 34 33 32 31

TB4STCOMCOM

46 45 44 43 42 41

RUN4.68(118.9)"T" Rail Din Mounting
Din EN 50022, 35mm

11 12 13 14 15 16

21 22 23 24 25 26

TB2

TB1
3.90(99.1)

1.05(26.7)
NOTE: ALL DIMENSION ARE IN INCHES (MILLIMETERS)

4.35(110.5)

PERSONAL COMPUTER
W/ WINDOWS 95/98 OR NT
RS-232 SERIAL
PORT CONNECTOR
AT BACK OF PC

PC RUNNING
ACROMAGMODBUS CONFIG
SOFTWARE

INSTALL MODBUSCONFIGURATIONSOFTWARE

RS-232 TO RS-485 CONVERTERMODEL 5034-214

CONNECT THE RS-232
SIDE OF CONVERTERTO THE PC

CAUTION: DO NOT CONNECT THE
CABLE DIRECTLY TO THE PC WITHOUTTHE CONVERTER, OR DAMAGE TO
THE MODULE MAY RESULT.

CABLE 5034-202

CONNECT THE RS-485
SIDE OF CONVERTERTO THE CABLE

900C-SIP COMMUNICATION CONNECTIONSCBACONNECT WIRES AS SHOWNCOM D

TB4TB4Acromag
RUN

RED

RS-485DBBLACKDCGREENCOM

REFER TO THE USER'S MANUALTHAT CAME WITH YOUR MODULETO COMPLETE THE MODULE'SPOWER AND I/O CONNECTIONSTB2TB1COLORAPWR

ANY 900MB MODULE

TB1RASTATUS LED FLASHES IN
DEFAULT MODE.

B

RS485

DDEFAULT MODE SWITCH PUSH FOR DEFAULT MODE.

DTB3

3WIRE

36 35 34 33 32 31
COM

246 45 44 43 42 41

TB3

COM

1RUN/PWR LED (GREEN)
STATUS LED (YELLOW)TB4STDFT0D

11 12 13 14 15 16

21 22 23 24 25 26

TB1

TB2

Tel: 248-295-0880 e-mail: sales@acromag.com www.acromag.com
8401-003

(This page intentionally left blank.)

Modbus

I/O■ Performance■ General■ Discrete Inputs(901 & 903 models only)
Input Type

5.6K ohm pull-up resistor SIPs are installed in sockets
at each port (four-channels per port).

I/O Pull-ups and Socket

12 active-low, buffered inputs, with a common connection. Inputs include transient suppression devices
and series connected 100K ohm resistors, plus diodeover-voltage clamps to the internal +5V supply.

Excitation (per port)

External excitation voltage for each four-channel port
is limited to 35V or less.

Supported Modbus Commands

0 to 35V DC, maximum.

Input Current

293µA, typical at 35V DC.

Input Signal Threshold

TTL compatible with 100mV of hysteresis, typical.
Low-to-High threshold is 1.7VDC, High-to-Low is
1.6VDC, typical. Limited to TTL levels of 0.8VDC(max. LOW level) and 2.0VDC (min. HIGH level).

Input Resistance

100K ohms, typical.

LED Indicators

Input Hysteresis

LEDs indicate power, status, and discrete level.

100mV DC, typical.

Power Requirements
10 to 36V DC,
22 to 26V AC.

■ Discrete Outputs(902 & 903 models only)
Output Type

12 independent, open-drain, DMOS MOSFET switcheswith a common source connection that operate as
low-side switches.

Output Voltage Range

0 to 35V DC max. (0 to 500mA/channel continuous).
External voltage source required.

Output ON Resistance
0.28 ohms maximum.

Models901MB-0900
Discrete input module
902MB-0900
Discrete output module
903MB-0900
Discrete input/output module

Accessories

900C-SIP
Configuration Software Interface Package(includes software CD-ROM for Windows,
RS-232/485 converter, and RS-485/three-wire cable)
4001-095
USB-to-RS232 adapter
TBK-B02
Optional terminal block kit, barrier strip style, 4 pcs.
TBK-S02
Optional terminal block kit, spring clamp style, 4 pcs.
PS5R-VB24
Power supply (24V DC, 2.1A)

Supply Current
Supply10V DC
24V DC
24V ACCurrent Draw
130mA maximum
54mA maximum
95mA maximum

Isolation

1500V AC for 60 seconds or 250V AC continuous.
3-way isolation between I/O, network, and power
circuits.

Output Response Time

Optional terminal blocks: barrier strip (left) andspring clamp (right). Cage clamp terminal is standard.

Force Single Coil: Output updates within 250µs ofreceipt of a command.
Force Multiple Coils: First coil updates in 250µs,
followed successively by additional coils every 180µs.
DIGITAL INPUT CONNECTIONS (ACTIVE LOW)

DIGITAL OUTPUT CONNECTIONS+ 12-24V DC,

CH 3RTNCH 0CH 1CH 2CH 3

INTERNAL INPUT
PULL-UPS ARE PRESENTCH 7RTNCH 8EXC3COM
COM
DDB
A

100K

TB3TO OTHER 3CHAN OF PORTDIGITAL
I/O

5-35VONOFF

NETWORKCOMMUNICATION

RTN

AC/DC
POWER
10 TO 36V DC
OR 24V AC
NON-POLARIZED

TB1
EXC1OUTCH 0
DIGITAL I/O
SHARES
RETURNRTN

CH 1CH 2
CH 3
RTN

RTN

Tel: 248-295-0880 e-mail: sales@acromag.com www.acromag.com

8401-003

V
I/O

902MB/903MB

TB3EXC1CH 6CH 936 35 34 33 32 31

TB2

TB1CH 5PWR

RTN

CH 4CH10TB4RS485

DIGITAL
I/O

EXC2

DIGITAL IN or OUT

21 22 23 24 25 26

INP
SPST
RELAY

RTN
CH11903MB shown.
901MB & 902MB
are similar.

TB2TYPICAL

RTN

CH 2TB1

RTN

CH 1TB4EXC

DIGITAL
I/O

CH 046 45 44 43 42 41

INP

11 12 13 14 15 16

RTN

EXC1

DIGITAL IN or OUT

TB1
DIGITAL IN or OUT

EXC
INP

DIGITAL I/O
SHARES
RETURN

LOAD+5V+5V

INP

EXC

903MB

5V TTL LOGIC - INPUT CAN BE PULLEDUP INTERNALLY OR EXTERNALLY

BusWorks® Modbus I/O

The command/response protocol for communicatingwith this module adheres to the Modbus/RTU standard
for the following Modbus Functions.
Read Coil (Output) Status
Read Input Status
Read Holding Registers
Force Single Coil (Output)
Preset Single Register
Reset Slave
Force Multiple Coils (Outputs)
Preset Multiple Registers
Report Slave ID

Input Signal Voltage Range■ Ordering
Information

Accessories
Model 4001-095 USB-to-Serial Adapter
PERSONAL COMPUTERRUNNING WINDOWS
98/ME/2000/XP

HOSTUSBTO HOST USB PORT

USB MALE

HOST PC RUNNING
ACROMAGCONFIGURATIONSOFTWARE

4001095
USB SERIAL CONVERTERLEDRS232
DB9P

6 FEET OF CABLE

Simplifies configuration of Acromag I/O Modules ◆ Enables configuration via USB port

Description

Performance Specifications

Ordering Information

This device is a USB-to-serial adapter that you
can use to communicate with many Acromag I/O
products for setup and re-configuration for yourapplication.

USB Specification
Version 1.1
Data rate
Up to 115.2Kbps
Environmental Standards
RoHS-compliant
Basic Power Consumption
150mA
PC Requirements
Windows® 7 and newer.

NOTE: For more information visit www.acromag.com.

Key Features & Benefits■Connects to I/O modules via USB(other adapters may be necessary)■

Complete RS232 control signals■

Conforms to USB Specification, Version 1.1■

USB-powered■

Cable length, 6 ft., UL approved

Adapters
4001-095
USB to serial adapter. Includes driver CD and manual.
5030-913
Serial port adapter. DB9S connector to RJ11 jack.
5034-202
RS-485 to 3-wire cable converter and cable, DB-9M to3 x 12AWG RS-485 cable, 8 ft.
5032-787
RS-232 to 151T transmitter configuration device
converter and cable, 6 ft.
5034-214
Non-isolated RS-232 to RS-485 Serial Port Converter,DB-9F to DB-9F.

CablesIntelliPack 800x Series
Adapter and Cable
9-PIN CONNECTOR (DB9S)

INTELLIPACKSERIAL ADAPTER

RJ11 JACK(6 CONDUCTOR)

5030-902
Cable. 6 feet long with RJ11 plug at each end.

RJ11 PLUG(6 CONDUCTOR)MODEL 5030-902(6 feet long)

MODEL 5030-913

900MB Modbus Series
Adapter and Cable
RS232 TO RS485 SERIALCONVERTER(MODEL 5034-214)

CABLE 5034-202

RS-485

RS-2325034-202C

DB9 FEMALE

DB9 FEMALEBA

DB9 MALECOM D D

Tel: 248-295-0880 ■ sales@acromag.com ■ www.acromag.com ■ 30765 S Wixom Rd, Wixom, MI 48393 USA
Bulletin #8400-572BAll trademarks are property of their respective owners. Copyright © Acromag, Inc. 2019. Data subject to change without notice. Printed in USA 5/2019.