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900MB

SeriesHigh-Density Discrete I/O Module

Modbus/RS-485

Inputs (4)orOutputs (4)TwelveDiscrete
Inputs or Outputs

Inputs (4)orOutputs (4)Isolation

Inputs (4)RS-485

Modbus10-36V DC
or 24V AC

Power

or

BusWorks® Modbus I/O

Outputs (4)901/902/903MB
Multi-Channel
Discrete I/O
Modules
Active-Low Inputs
Sinking Outputs(Low-Side Switching)
Models901MB: 12 input channels
902MB: 12 output channels
903MB: 12 input/output channels
Input
Twelve input channels (901, 903 models only)
0 to 35V DC
OutputTwelve output channels (902, 903 models only)
O to 35V DC
Network Communication
Modbus-RTU high-speed RS-485
Power Requirement
10 to 36V DC,24V ACApprovals
CE marked. UL, cUL listed
Class I; Division 2; Groups A, B, C, D.

■ Description■ Special Features

These modules provide twelve discrete input
and/or output channels. Isolation separates theI/O, power, and network circuits. Network
communication adheres to the industry-standard
RS-485 Modbus RTU protocol. Both AC and DC
power sources are supported with wide range,
nonpolarized, diode-coupled terminals.

■

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

Twelve I/O channels in a single inch-wide unit
reduces system costs and saves panel space■

High-voltage, high-current, open-drain outputs
enable direct (low-side) control of externaldevices■

High-voltage buffered inputs monitor discretelevels from a variety of industrial devices■

Tandem input/output circuitry (903 models
only) connects input buffers with open-drain
outputs for convenient loopback monitoring of
the output state■Outputs have built-in over-temperature andover-current shut-down protection, plus active
clamping circuits for switching inductive loads■

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, I/O, andnetwork circuitry■

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

The open-drain outputs are intended for currentsinking or low-side switching applications. The
buffered inputs are active-low. These models are
the complement of the 904, 905, and 906 units
which have open-source, high-side output
switches and active-high inputs. Socketed pull-up
resistors are easily removed or exchanged to satisfy your application requirements.
The 903MB model has twelve input/output
points that may be used as inputs or outputs ona bit-by-bit basis. Outputs may be read back toverify output settings.
Combining flexible I/O types, wide I/O ranges,
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 makes these modules reliable foruse in both control room and distributed field I/Oapplications. Custom module configurations arealso possible (consult factory for details).

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

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 AC

Current 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 3RTN

CH 0
CH 1CH 2CH 3INTERNAL INPUT
PULL-UPS ARE PRESENTCH 7RTNCH 8EXC3COMCOM
DDBA100K

TB3TO OTHER 3CHAN OF PORTDIGITAL
I/O

5-35V

ON

OFF

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

TB3

EXC1CH 6CH 936 35 34 33 32 31

TB2TB1

CH 5PWR

RTN

CH 4CH10TB4RS485

DIGITAL
I/O

EXC2

DIGITAL IN or OUT

21 22 23 24 25 26

INP
SPSTRELAY

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

TB2

TYPICAL

RTN

CH 2TB1

RTN

CH 1

TB4

EXC

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

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900MB

Series

900MB Series Technical Diagrams
TB4

TB3

Acromag

DFTBA

DDTB3

TB1

2.34
(59.4)

BusWorks® Modbus I/O

PWR

TB2

2 3CLRS485

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 DTB4

TB4Acromag
RUNRED

RS-485
DB

BLACK

DC

GREENCOMREFER TO THE USER'S MANUALTHAT CAME WITH YOUR MODULETO COMPLETE THE MODULE'S
POWER AND I/O CONNECTIONSTB2TB1COLORAPWRANY 900MB MODULETB1RASTATUS LED FLASHES IN
DEFAULT MODE.

BRS485

DDEFAULT MODE SWITCH PUSH FOR DEFAULT MODE.

DTB33WIRE

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

TB3COM

1RUN/PWR LED (GREEN)
STATUS LED (YELLOW)TB4STDFT0

D11 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

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ModbusConfiguration Kit
Software Interface Package
Model No. 900C-SIP
RS-485 Cable(DB-9)

RS-232 to RS-485
Converter(non-isolated)■ Ordering Information

SoftwareInterface Package

900C-SIP
Software Interface Package.
Includes Configuration Software (5034-186),
Non-isolated RS-232 to RS-485 Serial Port Converter(5034-214), and RS-485 Cable (5034-202).
Items can also be ordered separately below.
5034-186
Configuration Software for WindowsXPandnewer
on CD-ROM.
5034-214
Non-isolated RS-232 to RS-485 Serial Port Converter,
DB-9F to DB-9F.
5034-202
RS-485 to 3-wire Cable Converter,
DB-9M to 3 x 12AWG RS-485 Cable, 8 ft.

This package includes Windows® Configuration
Software, an RS-232-to-485 Serial PortConverter, and an RS-485 Signal Cable. These
components provide everything you need to set
up a Series 900 I/O module from your desktop
PC before installing it on the network.
RS-232/485
Converter(non-isolated)

Configuration Software
for Windows

I/O

RS-485to 3-wire

5034-2145034-202

Top View(dimensions in mm)

Side View(dimensions in mm)

56.

-ø

103.8

9080

ø44-

13.5

The PS5R-VB24 is
the ideal powersource to drive yournetwork.

PS5R-VB24
Universal Power Supply

131313

DC ON

35.3

Universal power
85 to 264V AC,
105 to 370V DC

6075

Input Power
Requirement
V.ADJOutput524V DC, 0.65A (15W)
M3.5
Terminal Screws

695

12Mounting Hardware

DIN-Rail
Mounting
For your convenience, Acromag offers several
mounting accessories to simplify your systeminstallation. Our 19” rack-mount kit provides aclean solution for mounting your I/O modules
and a power supply. Or you can buy precut DIN
rail strips for mounting on any flat surface.

■ Ordering Information
20RM-16-DIN
19" rack-mount kit with DIN rail.
DIN RAIL 3.0
DIN RAIL 16.7
DIN rail strip, Type T, 3 inches (75mm) or16.7 inches (425mm)

Dimensions in inches (mm).
Tel: 248-295-0880 e-mail: sales@acromag.com www.acromag.com
8401-003

BusWorks® Modbus I/O■ Ordering Information

Universal 50W
Power Supply

Network Power

7.35

8400100.qxp

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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 CONVERTER
LED

RS232
DB9P

6 FEET OF CABLE

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

DescriptionPerformance 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 approvedAdapters
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 #8400-572B

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