8400100.qxp

3/20/2006

3:17 PM

Page 58

900MBSeries

DC Current/Voltage Input Module

Modbus/RS-485

Four
DiscreteOutputsor
Limit Alarms

Inputs (2)Four
DC Currentor
DC Voltage
Inputs

Outputs (4)Isolation

RS-485

Modbus10-36V DC
or 24V AC

PowerBusWorks® Modbus I/O

Inputs (2)913/914MB
Multi-Channel
Analog Input
Modules
DC Current,
DC Voltage or
AC Current Input
Limit Alarms or
Discrete Outputs

Input Ranges
0 to 20mA DC,±10V DC,
0 to 20A AC (with 5020-350 sensor)
OutputFour output channels:
Open-drain MOSFETs (1A DC loads)
0 to 35V DC
Network Communication
Modbus-RTU high-speed RS-485

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

■ Special Features

This signal conditioner is a four-channel analog
input module with four discrete outputs. It
provides isolation between input, 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)■

16-bit sigma-delta A/D yields 0.1% of range
resolution and accuracy■

Four inputs in a single inch-wide module
reduces system costs and saves panel space■

Four discrete outputs enable local limit alarms
or 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■Four-way isolation eliminates potential groundloops between power, input, output, andnetwork circuitry■

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

The inputs accommodate wide DC voltage orcurrent ranges. Flexible discrete outputs operate
as alarms or on/off controllers. As limit alarms,
each discrete output can be configured with highand/or low setpoints exclusively tied to an analog
input channel. Alarm trips function without hostcommunication enabling low-cost stand-alone
alarms, as well as local backup for the primarycontrol system. Otherwise, on/off control isbased on commands issued by the host system.

Models913MB: 4 current input channels
914MB: 4 voltage input channels

Power Requirement
10 to 36V DC,
24V AC■ Description

Combining flexible transmitter functions, mixed
signal I/O, alarm support, and a network interface in a single package, makes this instrument
extremely powerful. Multi-channel design adds
cost-efficiency and allows high-density mounting.
Plus, safe, rugged construction makes thesemodules reliable for use in both control roomand distributed field I/O applications. Custom
module configurations are also possible (consultfactory for details).

AC Current Sensor Model 5020-350
0.375"
dia.
RedBlackIN+IN-5020-350

1.35"

TB1/TB2

For 913MB. Order separately (one per channel).
Tel: 248-295-0880 e-mail: sales@acromag.com www.acromag.com

8401-003

1.05"

Modbus I/O
Discrete Output
Output Type

Performance Specifications
General Input
Resolution

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

0.005% or 1 part in 20,000.

Output Voltage Range

Noise Rejection

Output Current Range

Input Filter Bandwidth

0 to 1A DC continuous for each output.

-3dB at 3Hz, typical.

Output ON Resistance
0.15 ohms maximum.

Current Input (913MB)
DC Current Input Ranges

Output Response Time

Ordering
Information

Operation

Models

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

±0.1% of input range.

Digital outputs are set to their OFF state following asoftware or power-on reset. Outputs can optionallybe set to user-defined states following a watchdogtimeout. Watchdog timeout output control takes precedence over limit alarm control. Alarm control takes
precedence over host control.

Voltage Input (914MB)
DC Voltage Input Ranges

Communication
Supported Modbus Commands

DC Current Input Resistance
49.9 ohms.

DC Current Input Accuracy

Range user-configured. Range selected applies to allchannels.
±10V, ±5V, ±2.5V, ±1.25V,±625mV, ±313mV, ±156mV, ±78mV

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

Input Impedance
110.5K ohms.

DC Voltage Input Accuracy±0.1% of input range.

913MB-0900
914MB-0900
DC current (913MB) or voltage ( 914MB) input module

Accessories

900C-SIP
Configuration Software Interface Package(includes software CD-ROM for Windows, RS-232/485
converter, and RS-485/three-wire cable)
5020-350
AC current sensor for 913MB. One for each channel
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)

LED Indicators

LEDs indicate power, status, and discrete level/alarm.
ANALOG INPUTCONNECTIONSDIGITAL OUTPUT CONNECTIONS

IN+IN-

IN+-IN-

IN3-

DB
A

DIGITAL OUTPUT+UP TO
35V DCNETWORKCOMMUNICATION

TB3

TB1/TB2

IN3+COM

MECHANICALRELAY INTERFACE

36 35 34 33 32 31

VOLTAGESOURCE+OUT0DPWR

TB2VOLTAGE INPUT

IN2-RS485

IN--RTNOUT1COMIN2+INPUTS 2,3

ANALOGINPUT

IN+OUT2

TB3

TB2
21 22 23 24 25 26

DC
CURENT(mA)

TB1/TB2+

IN1-

OUT3TB4

TB1

CURRENT INPUTIN0IN1+RTN

46 45 44 43 42 41

ANALOGINPUT

TB1/TB2

DIGITAL OUTPUTS+IN0+

INPUTS 0,1

11 12 13 14 15 16

TWO-WIRE TRANSMITTER
2-WIREXMTR -

TB4

TB1

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

OUT
RTN

TB4

RTN

RTN
OUT 3

OUT
DIGITAL OUTSHARES
RETURNOUT 2RTN
OUT 1
OUT

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

BusWorks® Modbus I/O

Range user-configured. Range selected applies to allchannels.
0 to 1mA, 0 to 20mA, 4 to 20mA,
0 to 11.17mA (for use with 5020-350 AC sensor).

Current Draw
125mA maximum
50mA maximum
100mA rms maximum

1500V AC for 60 seconds or 250V AC continuous.
4-way isolation between input, network, power, anddiscrete I/O circuits. Inputs are isolated channel-tochannel for common mode voltage to ±4V DC.

50µA maximum.

180ms per channel.

Supply CurrentIsolation

Output OFF Leakage Current

Input Conversion Rate

10 to 36V DC or 22 to 26V AC.
Supply10V DC		24V DC		24V AC		

0 to 35V DC.
External voltage source required.

Normal mode: 40dB @ 60Hz, typical.
Common mode: 140dB @ 60Hz, typical.

Power and Isolation
Power Requirements

8400100.qxp

3/20/2006

3:18 PMPage 68

900MB

Series

900MB Series Technical Diagrams
TB4

TB3

Acromag

DFTB
A

D

D

TB3

TB1

2.34(59.4)

BusWorks® Modbus I/O

PWR

TB2

2 3

CLRS485

3.75(95.3)

0 1

36 35 34 33 32 31

TB4STCOMCOM

46 45 44 43 42 41RUN

4.68(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 DTB4TB4Acromag
RUNRED

RS-485DBBLACKDCGREENCOM

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

ANY 900MB MODULE

TB1RASTATUS LED FLASHES IN
DEFAULT MODE.

B

RS485

DDEFAULT MODE SWITCH PUSH FOR DEFAULT MODE.

DTB33WIRE

36 35 34 33 32 31COM246 45 44 43 42 41

TB3

COM

1

RUN/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 3
RTN

CH 0
CH 1
CH 2
CH 3

INTERNAL INPUT
PULL-UPS ARE PRESENT

CH 7
RTN

CH 8
EXC3COMCOM
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 2CH 3RTN

RTN

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

8401-003

V
I/O

902MB/903MB

TB3

EXC1CH 6

CH 936 35 34 33 32 31

TB2

TB1CH 5PWR

RTN

CH 4CH10TB4RS485

DIGITAL
I/O

EXC2

DIGITAL IN or OUT21 22 23 24 25 26

INP
SPST
RELAY

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

TB2

TYPICAL

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)

5030-902Cable. 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 FEMALE

B

A

DB9 MALECOM D D

Tel: 248-295-0880 ■ sales@acromag.com ■ www.acromag.com ■ 30765 S Wixom Rd, Wixom, MI 48393 USA
Bulletin #8400-572B

All trademarks are property of their respective owners. Copyright © Acromag, Inc. 2019. Data subject to change without notice. Printed in USA 5/2019.