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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 ACPowerorBusWorks® Modbus I/O

Outputs (4)904/905/906MB
Multi-Channel
Discrete I/O
Modules
Active-High Inputs
Sourcing Outputs(High-Side Switching)
Models904MB: 12 input channels
905MB: 12 output channels
906MB: 12 input/output channels
Input
Twelve input channels (904, 906 models only)
0 to 35V DC
OutputTwelve output channels (905, 906 models only)
6 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
the I/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-source
outputs enable direct (high-side) control ofexternal devices■

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

Tandem input/output circuitry (906 models
only) connects input buffers with open-source
outputs for convenient loopback monitoring of
the output state■

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 outputs are intended for current-sourcing or
high-side switching applications. The bufferedinputs are active-high. These models are thecomplement of the 901, 902, and 903 units
which have low-side output switches andactive-low inputs. Socketed pull-down resistors
are easily removed or exchanged to satisfy yourapplication requirements.
The 906MB 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

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Modbus■ Performance

Output Response Time

■ Discrete Inputs(904 & 906 models only)
Input Type■ GeneralI/O

Outputs update within 50ms of a write command andswitch within 5mS of receipt of command. Loopback
response (906MB) is 1µS low-to high, 5µS high-to-low.

12 active-high, 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.

I/O Pull-downs and Socket
5.6K ohm pull-down resistor SIPs are installed insockets at each port (four-channels per port).

Excitation (per port)

Input Signal Voltage Range

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

0 to 35V DC, maximum.

Input Current

Supported Modbus Commands

293µA, typical at 35V DC.

Input Signal Threshold

Input Resistance
5.6K ohms with standard factory pull-down resistors
installed. 100K ohms without pull-downs.

Input Hysteresis
100mV DC, typical.

Input Response Time
500ns for low-to-high, 2µS for high-to-low, typical.
Microcontroller samples inputs as a group every 10mS.

LED Indicators■ Discrete Outputs(905 & 906 models only)
Output TypePower Requirements

12 independent, open-source, MOSFET switches that
operate as high-side switches.

Supply Current

6 to 35V DC (0 to 250mA/channel continuous).
External excitation voltage required.

Output ON Resistance

Isolation

Current Draw
90mA maximum
40mA maximum
75mA rms maximum

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

DIGITAL OUTPUT CONNECTIONSDIGITAL INPUT CONNECTIONS (ACTIVE HIGH)
5V TTL LOGIC INPUT IS ACTIVE HIGH
AND PULLED DOWN INTERNALLY

RELAY COIL/SOLENOID DRIVER (905MB/906MB)

+5V

RTN

CH 8
EXC3ON (1)+OFF (0)DIGITAL
I/OCOMCOMDRCHLEDTO OTHER 3CHAN OF PORTOPENRTN

DBA

INTERNAL PULLDOWN IS OPEN
FOR 905MB

AC/DC
POWER
10 TO 36V DC
OR 24V AC
NON-POLARIZEDLocate
Snubberat Coil

TB1
EXC1OUTCH 0
DIGITAL I/O
SHARES
RETURNRTN

CH 1CH 2CH 3
RTN

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

5-35V
TypicalI/O

NETWORKCOMMUNICATION

TB3

RTN

CH 7

CH 9

TB4

CH 3

CH 6

CH1036 35 34 33 32 31

CH 2

CH 5

PWR

CH 1

INTERNAL
INPUT
PULL-DOWNSARE PRESENTCH 4CH11905MB

TB3
RS485

TB2

CH 0

EXC2906MB shown.
904MB & 905MB
are similar.

COM

46 45 44 43 42 41

RTN

DIGITAL IN or OUT

CH 3

DIGITAL IN or OUT

21 22 23 24 25 26

DIGITAL
I/O

EXC1

COM

CH 2

TB1

INP

TB1

DIGITAL I/O
SHARESCOMMON

CH 1

TB2

RTN

INP

CH 0

DIGITAL IN or OUT

11 12 13 14 15 16

DIGITAL
I/O

EXC1

EXC

TB4

TB1

SPST
RELAY

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)

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

0.15 ohms maximum.

UP TO
35V DC+Accessories

10 to 36V DC,
22 to 26V AC.
Supply10V DC
24V DC
24V ACCOM

904MB-0900
Discrete input module
905MB-0900
Discrete output module
906MB-0900
Discrete input/output module

LEDs indicate power, status, and discrete level.

Output Voltage Range

INP

ModelsBusWorks® Modbus I/O

TTL compatible with 100mV of hysteresis, typical.
Thus, Low-to-High threshold is 1.5VDC, High-to-Low is
1.4VDC, typical. Limited to TTL levels of 0.8VDC(max. LOW level) and 2.0VDC (min. HIGH level).

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
Read Input Registers
Force Single Coil (Output)
Preset Single Register
Reset Slave
Force Multiple Coils (Outputs)
Preset Multiple Registers
Report Slave ID■ OrderingInformation

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3/20/20063:18 PMPage 68

900MB

Series

900MB Series Technical Diagrams
TB4

TB3

Acromag

DFTB
A

DDTB3

TB1

2.34(59.4)

BusWorks® Modbus I/O

PWR

TB2

2 3

CLRS485

3.75(95.3)

0 136 35 34 33 32 31

TB4

STCOMCOM

46 45 44 43 42 41

RUN

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
SOFTWAREINSTALL 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-485DBBLACKDCGREENCOMREFER TO THE USER'S MANUALTHAT CAME WITH YOUR MODULETO COMPLETE THE MODULE'S
POWER AND I/O CONNECTIONS

TB2

TB1COLORA

PWR

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)
TB4

ST

DFT0

D

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.com8401-003

(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 3RTN

CH 0
CH 1
CH 2CH 3

INTERNAL INPUT
PULL-UPS ARE PRESENT

CH 7
RTN

CH 8
EXC3COM
COM
DDB
A

100K

TB3TO OTHER 3CHAN OF PORTDIGITAL
I/O

5-35V

ON

OFF

NETWORKCOMMUNICATION

RTN

AC/DC
POWER
10 TO 36V DC
OR 24V AC
NON-POLARIZEDTB1
EXC1OUTCH 0
DIGITAL I/O
SHARES
RETURNRTN

CH 1CH 2CH 3
RTNRTN

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

TB2

TB1

CH 5

PWR

RTN

CH 4CH10

TB4

RS485

DIGITAL
I/O

EXC2

DIGITAL IN or OUT

21 22 23 24 25 26

INP
SPST
RELAY

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

TB2

TYPICAL

RTN

CH 2

TB1

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
INPDIGITAL I/OSHARESRETURN

LOAD+5V+5V

INP

EXC903MB

5V TTL LOGIC - INPUT CAN BE PULLEDUP INTERNALLY OR EXTERNALLYBusWorks® 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■ OrderingInformation

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

HOST
USB

TO 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
150mAPC 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-2325034-202

C

DB9 FEMALE

DB9 FEMALEBADB9 MALE
COM D D

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