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

9 0 0 M B S e r i e sM

odbu

s I/O

BusW

orks

®

942MBFrequency/Pulse CounterModules

Periodic or PulseWaveform Input

Limit Alarms orDiscrete Outputs

Model942MB: 2 input channels

InputTwo input channels:0 to 50KHz in three selectable rangesAmplitudes up to 140V AC or 200V peakPulse counter range of 0 to 65535

OutputTwo output channels:Solid-state relays (1A DC loads)0 to 48V DC

Network CommunicationModbus-RTU high-speed RS-485

Power Requirement10 to 36V DC,24V AC

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

n DescriptionThis signal conditioner is a two-channel analoginput module with discrete outputs and Modbuscommunication. It conditions periodic or pulsewaveform inputs and provides solid-state relaysfor limit alarms or ON/OFF control.

Versatile inputs accommodate many applicationsusing TTL, magnetic pickups, proximity sensors,or a variety of switches (high/low-side transistor,dry contact, open drain, open collector). Bipolarand unipolar waveforms are supported with aselectable input bias that accepts both zero andnon-zero crossing signals. Voltage threshold andrelative hysteresis are also user selectable.

Inputs may also function as event counters withseparate microcontrollers for each channel. Themodule counts pulses on the positive or negativeedge. It can wrap around to zero for continuouscounting, latch at a programmed count value(setpoint), or automatically reset itself to zeroafter reaching a setpoint value. Software controlsenable remote resets. A variety of filters helpremove noise, jitter, and other mechanical effectsto prevent false counts.

The discrete outputs can operate as independentalarms or provide on/off control regulated by thehost system. As limit alarms, each output can beset for high and/or low setpoints exclusively tiedto an analog input. These low cost modules areideal for standalone alarms as well as for localbackup of the primary control system.

n Special Featuresn Standard Modbus RTU protocol with high-speed

RS-485 communication (up to 115K bps)

n Separate microcontrollers on each channel forpulse counting and period measurement

n Solid-state relay outputs enable local limitalarms or host-controlled on/off switching

n Bipolar and unipolar input signal support

n Programmable pulse counter functions

n Input filtering functions include hysteresis,averaging, debounce, relay time delay, andalarm deadband controls

n 4-way isolation (input, output, power, network)

n Watchdog timers provide a failsafe output

n Self-diagnostics monitor microcontroller activityto detect operational failures (lock-up) andexecute a reset to restore communication

Modbus

Two Frequency

or Pulse

Waveform Inputs

RS-485

10-36V DC�or 24V AC

Isolation

Two Discrete�Outputs�

or�Limit Alarms

Power

Outputs (2)Inputs (2)

Frequency/Counter Module

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

Modbus/RS-485

8400100.qxp 3/20/2006 3:18 PM Page 66

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

M o d b u s I / OM

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n Performance

n Frequency/Counter InputInput RangesInput type user-configured. Applies to both channels.Input Range Accuracy Accuracy over Temp.0 to 100Hz ±0.04Hz ±0.06Hz0 to 1000Hz ±0.4Hz ±0.6Hz0 to 50,000Hz ±10Hz ±15Hz0 to 65,535 pulses ±1 pulse ±1 pulse

Unipolar Input ConfigurationAmplitude: 0 to 3V minimum range, 0 to 200V peak maximum range.Threshold: Configurable for 1.5V or 5V, typical.Hysteresis: Configurable for ±25mV (at 1.5V thresh-old), or ±83mV (at 5.0V threshold), typical.

Bipolar (Zero-Crossing) Input ConfigurationAmplitude (0-20KHz): ±50mV minimum (with ±25mVhysteresis), or ±150mV minimum (with ±83mV hys-teresis), to ±200V peak maximum.Amplitude (Above 20KHz): ±100mV minimum (with±25mV hysteresis), or ±200mV minimum (with ±83mVhysteresis), to ±200V peak maximum.Threshold: 0mV nominal, 0.01V typical with ±25mVhysteresis; 0.03V typical with ±83mV hysteresis.Hysteresis: Configurable for ±25mV or ±83mV, typical.

Resolution0 to 100Hz input range: 0.01Hz0 to 1000Hz input range: 0.1Hz0 to 50,000Hz input range: 1HzPulse counter: 1 pulse

Minimum Input Pulse Width10µS (frequency input); 5mS (pulse input).

Counting Rate100Hz maximum counting rate(5mS ON and 5mS OFF for 10mS period or 100Hz).

Input Impedance35K ohms, typical.

Input Filter Bandwidth-3dB at 35kHz, typical.

Input Pullup/PulldownSoftware selectable 2.7K ohm input pullup to +5V anda 1K ohm input pulldown to return. The resistors mayalso be left floating (none).

Input Debounce0 to 1.375 seconds, configurable in 5mS increments.

Noise Rejection Common mode: 80dB @ 60Hz, typical with 100 ohminput unbalance.

n Discrete OutputOutput TypeSolid-State Relay (SSR), one Form A (SPST-NO) switchper input channel. Outputs share a common returnconnection at the RTN terminals for low-side switching

Output Voltage Range0 to 48V DC, 1A DC.

Output ON Resistance0.4 ohms maximum.

Output Response Time4.1ms typical, from receipt of command to gate transition of the output MOSFET.

OperationDigital outputs are set to their OFF state following asoftware or power-on reset. Outputs can be set touser-defined states following a watchdog timeout.

n CommunicationSupported Modbus CommandsThe command/response protocol for communicatingwith this module adheres to the Modbus/RTU standardfor the following Modbus Functions.

Read Holding Registers Read CoilRead Input Registers Reset SlavePreset Single Register Report Slave IDForce Multiple Coils Force Single CoilPreset Multiple Registers

LED IndicatorsLEDs indicate power, status, and discrete level/alarm.

n Power and IsolationPower Requirements10 to 36V DC.22 to 26V AC.

Isolation1500V AC for 60 seconds or 250V AC continuous. 4-way isolation between input, network, power anddiscrete I/O circuits. Inputs are isolated channel-to-channel for common mode voltage to ±5V DC.

n OrderingInformation

942MB-0900Frequency/counter input module

Accessories900C-SIPConfiguration Software Interface Package(includes software CD-ROM for Windows, RS-232/485 converter, and RS-485/three-wire cable)4001-095USB-to-RS232 adapterTBK-B02Optional terminal block kit, barrier strip style, 4 pcs.TBK-S02Optional terminal block kit, spring clamp style, 4 pcs.PS5R-VB24Power supply (24V DC, 2.1A)

FREQUENCY INPUT

ANALOG INPUT CONNECTIONS D

IGIT

AL

OU

TP

UT

S

45

46

TB4

DIGITAL OUTPUT

TB

4

RTN

OUT1

44

43

42

36

41

TB3

OUT0

11

TB1

12

FR

EQ

. INP

UT

0, 1

13 RTN

NC

14

15

16

FRQ1

RTN

D

COMCOM

D

RS

48

5

33

34

35

31

32

A

B

PW

R

TB

3

TB

1

ANALOG�INPUT

AC/DC�POWER

NETWORK�COMMUNICATION

DIGITAL OUTPUT CONNECTIONS

OUT 3

OUT 0

OUT 2

RTN

OUT 1

RTNTB4

OUT

RTN

DIGITAL OUT SHARES RETURN

10 TO 36V DC�OR 24V AC�NON-POLARIZED

FRQ0

RTN

FRQ1

RTN

FREQUENCYGENERATOR -

+

MAGNETICPICKUP -

+

HIGH-SIDE SWITCH�(Open Collector/Drain)

FRQ0

RTN

FRQ0RTN

FRQ0RTN

MAGNETIC INPUT

or

FRQ0

RTNor

V+V+V+V+

LOW-SIDE SWITCH�(Open Collector/Drain)

DRY CONTACT

FRQ0RTN

TTLV+V+V+

NC

FRQ0

UP TO 48V DC

MECHANICAL�RELAY INTERFACE

+

RTN

OUT

TB1

8400100.qxp 3/20/2006 3:18 PM Page 67

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

9 0 0 M B S e r i e sM

odbu

s I/O

BusW

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®

262524

TB2TB1

(110.5)4.35

(99.1)3.90

232221

TB

2

161512 13 1411

TB

1

D AB

PWR

TB3

33 313236 3435

TB4

414243444546

D

CO

MC

OM

RS485

TB

3

TB

4

DFT

32

10

ST

(118

.9)

4.68

(95.

3)3.

75

AcromagRUN

CL

(26.7)1.05

(59.

4)2.

34

NOTE: ALL DIMENSION ARE IN INCHES (MILLIMETERS)

"T" Rail Din Mounting Din EN 50022, 35mm

900MB Series Technical Diagrams

PERSONAL COMPUTERW/ WINDOWS 95/98 OR NT

RS-232 SERIALPORT CONNECTORAT BACK OF PC

RS-232 TO RS-485 CONVERTERMODEL 5034-214

900C-SIP COMMUNICATION CONNECTIONS

CONNECT THE RS-232SIDE OF CONVERTERTO THE PC

424345 44

TB

4

46

0 1

DFT

TB4

STSTATUS LED (YELLOW)RUN/PWR LED (GREEN)

DEFAULT MODE SWITCH -PUSH FOR DEFAULT MODE.

STATUS LED FLASHES INDEFAULT MODE.

RUNAcromag

INSTALL MODBUSCONFIGURATIONSOFTWARE

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

CABLE 5034-202

COM

D

D

CONNECT THE RS-485SIDE OF CONVERTERTO THE CABLE

CONNECT WIRES AS SHOWN

RS-485

GREENC

BLACK

RED

B

A

COLORWIRE

B AC

TB3

D

32

B

PWR

31

A

TB4

COM D

CO

M

CO

M

36 35

DD

34 33

RS485

41

TB

3

16 2221

TB

2

23 24 2625

TB2TB1

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

32

R

TB1

12 1311

ANY 900MB MODULE

TB

1

14 15

PC RUNNING�ACROMAG�

MODBUS CONFIG�SOFTWARE

8400100.qxp 3/20/2006 3:18 PM Page 68

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M o d b u s I / OM

odbus I/OBusW

orks ®

■ Performance

■ Discrete Inputs(901 & 903 models only)Input Type12 active-low, buffered inputs, with a common con-nection. Inputs include transient suppression devicesand series connected 100K ohm resistors, plus diodeover-voltage clamps to the internal +5V supply.

Input Signal Voltage Range0 to 35V DC, maximum.

Input Current293µA, typical at 35V DC.

Input Signal ThresholdTTL compatible with 100mV of hysteresis, typical.Low-to-High threshold is 1.7VDC, High-to-Low is1.6VDC, typical. Limited to TTL levels of 0.8VDC(max. LOW level) and 2.0VDC (min. HIGH level).

Input Resistance100K ohms, typical.

Input Hysteresis100mV DC, typical.

■ Discrete Outputs(902 & 903 models only)Output Type12 independent, open-drain, DMOS MOSFET switcheswith a common source connection that operate aslow-side switches.

Output Voltage Range0 to 35V DC max. (0 to 500mA/channel continuous).External voltage source required.

Output ON Resistance0.28 ohms maximum.

Output Response TimeForce 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.

■ GeneralI/O Pull-ups and Socket5.6K ohm pull-up resistor SIPs are installed in socketsat each port (four-channels per port).

Excitation (per port)External excitation voltage for each four-channel portis limited to 35V or less.

Supported Modbus CommandsThe command/response protocol for communicatingwith this module adheres to the Modbus/RTU standardfor the following Modbus Functions.

Read Coil (Output) StatusRead Input Status Read Holding RegistersForce Single Coil (Output)Preset Single RegisterReset SlaveForce Multiple Coils (Outputs)Preset Multiple RegistersReport Slave ID

LED IndicatorsLEDs indicate power, status, and discrete level.

Power Requirements10 to 36V DC, 22 to 26V AC.

Supply CurrentSupply Current Draw10V DC 130mA maximum24V DC 54mA maximum24V AC 95mA maximum

Isolation1500V AC for 60 seconds or 250V AC continuous. 3-way isolation between I/O, network, and powercircuits.

■ OrderingInformation

Models901MB-0900Discrete input module902MB-0900Discrete output module903MB-0900Discrete input/output module

Accessories900C-SIPConfiguration Software Interface Package(includes software CD-ROM for Windows, RS-232/485 converter, and RS-485/three-wire cable)4001-095USB-to-RS232 adapterTBK-B02Optional terminal block kit, barrier strip style, 4 pcs.TBK-S02Optional terminal block kit, spring clamp style, 4 pcs.PS5R-VB24Power supply (24V DC, 2.1A)

DIGITAL INPUT CONNECTIONS (ACTIVE LOW) DIGITAL OUTPUT CONNECTIONS

RTN

+5V

INP

INP

RTN

CH 0

RTN

CH 1

CH 2

CH 3

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

DIGITAL I/OSHARESRETURN

EXC1TB1

INTERNAL INPUTPULL-UPS ARE PRESENT

DIG

ITAL

INo

rO

UT

CH11

RTN

46

45

44CH10

RS

48

5

41

42

43

EXC3

TB4

CH 8

CH 9

35

36

COM

COM

TB1

DIG

ITAL

INo

rO

UT

12

11

CH 0

EXC1

CH 1

13

14

15

CH 2

CH 3

RTN

16

DIG

ITAL

INo

rO

UT

TB2

21 EXC2

CH 4

22

24

23

CH 6

CH 5

RTN

CH 7

25

26

34

33D

D

31

32

TB3

PW

R

DIGITALI/O

10 TO 36V DCOR 24V ACNON-POLARIZED

DIGITALI/O

DIGITALI/O AC/DC

POWER

NETWORKCOMMUNICATION

903MB shown.901MB & 902MB

are similar.

A

B

TB

3

TB

2

TB

4

TB

1

CH 0

RTN

CH 1

CH 2

CH 3

EXC1TB1

OUT

RTN

DIGITAL I/OSHARESRETURN

EXC

INP

SPSTRELAY

12-24V DC,TYPICAL

+

RTN

EXC

RTN

INP

5-35V

V

RTN

I/O

902MB/903MBON

TO OTHER 3CHAN OF PORT100K

OFF

EXC903MB

+5V

LOAD

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

8401-003

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

PERSONAL COMPUTERRUNNING WINDOWS

98/ME/2000/XP

6 FEET OF CABLE

USB MALE

DB9P

RS232

4001095USB SERIAL CONVERTER

LED

TO HOST USB PORTHOSTUSB

CONFIGURATIONSOFTWARE

ACROMAGHOST PC RUNNING

Bulletin #8400-572B

DescriptionThis 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 your application.

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

Performance SpecificationsUSB SpecificationVersion 1.1Data rateUp to 115.2KbpsEnvironmental StandardsRoHS-compliantBasic Power Consumption150mAPC RequirementsWindows® 7 and newer.

Ordering InformationNOTE: For more information visit www.acromag.com.

Adapters4001-095USB to serial adapter. Includes driver CD and manual.5030-913Serial port adapter. DB9S connector to RJ11 jack.5034-202RS-485 to 3-wire cable converter and cable, DB-9M to 3 x 12AWG RS-485 cable, 8 ft. 5032-787RS-232 to 151T transmitter configuration device converter and cable, 6 ft. 5034-214Non-isolated RS-232 to RS-485 Serial Port Converter, DB-9F to DB-9F.

Cables5030-902Cable. 6 feet long with RJ11 plug at each end.

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

Model 4001-095 USB-to-Serial Adapter

Accessories

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

9-PIN CONNECTOR (DB9S)

RJ11 PLUG(6 CONDUCTOR)

(6 CONDUCTOR)RJ11 JACK

INTELLIPACK

MODEL 5030-913

SERIAL ADAPTER

MODEL 5030-902(6 feet long)

BC

D D

RS

-232

COM

A

RS

-485

5034-202

CABLE 5034-202

RS232 TO RS485 SERIALCONVERTER(MODEL 5034-214)

DB9 MALEDB9 FEMALE DB9 FEMALE

IntelliPack 800x Series Adapter and Cable

900MB Modbus Series Adapter and Cable