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

9 0 0 M B S e r i e sM

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®

924MBMulti-ChannelTemperatureControl Modules

Thermocouple orMillivolt Input

Limit Alarms orDiscrete Outputs

Model924MB: 4 input channels

InputFour input channels:Thermocouple (types J, K, T, R, S, E, B, N),±100mV DC

OutputFour output channels:Open-drain MOSFETs (1A DC loads)0 to 35V 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 four-channel analoginput module with four discrete outputs. It filtersand linearizes thermocouple inputs while provid-ing isolation between input, output, power, andnetwork circuits. Cold junction compensationand upscale/downscale sensor break detectionare standard. AC and DC power sources are sup-ported with nonpolarized, diode-coupled termi-nals.

The programmable inputs accommodate eightthermocouple types plus wide-range millivolt signals. Flexible discrete outputs operate asalarms or on/off controllers. As limit alarms, eachdiscrete output can be configured with highand/or low setpoints exclusively tied to an analoginput channel. Alarm trips function without hostcommunication enabling low-cost stand-alonealarms as well as local backup for the primarycontrol system. Otherwise, on/off control isbased on commands issued by the host system.

Combining flexible transmitter functions, mixedsignal I/O, alarm support, and a network inter-face in a single package, makes this instrumentextremely powerful. Multi-channel design addscost-efficiency and allows high-density mounting.Plus, safe, rugged construction makes thesemodules reliable for use in both control roomand distributed field I/O applications. Custommodule configurations are also possible (consultfactory for details).

n Special Featuresn Standard Modbus RTU protocol with high-speed

RS-485 communication (up to 115K bps)

n 16-bit sigma-delta A/D yields 0.1°C resolutionand 0.5°C measurement accuracy

n Thermocouple linearization and sensor breakdetection ensure reliable measurements

n Four discrete outputs enable local temperaturelimit alarms or host-controlled on/off switching

n Heavy-duty 1A solid-state relays providedependable on/off control of industrial devices

n Self-calibration lowers maintenance costs byreducing periodic manual calibration checks

n Watchdog timers provide a configurablefailsafe output state for use when hostI/O communication is lost

n Four-way isolation eliminates potential groundloops between power, input, output andnetwork circuitry

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

Modbus

Four�Thermocouple�

or�DC Millivolt�

Inputs RS-485

10-36V DC�or 24V AC

Isolation

Four�Discrete�Outputs�

or�Limit Alarms

Power

Outputs (4)Inputs (2)

Inputs (2)

Thermocouple/Millivolt Input ModuleModbus/RS-485

8400100.qxp 3/20/2006 3:18 PM Page 62

8401-003

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 General InputResolution±100mV DC input: 0.1%.Thermocouple input: 0.1°C (0.18°F).

Ambient Temperature EffectBetter than ±0.005% of input span per °C, or±1.0uV/°C, whichever is greater.

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

Input Filter Bandwidth-3dB at 3Hz, typical.

Input Conversion Rate90ms per channel.

n Thermocouple InputThermocouple Input RangesThermocouple type user-configured. Type selectedapplies to all channels. Signal linearization, cold-junc-tion compensation, and open circuit or lead breakdetection are included.TC °C Range (°F Range) AccuracyJ -210 to 760°C (-346 to 1400°F) ±0.5°CK -200 to 1372°C (-328 to 2502°F) ±0.5°CT -260 to 400°C (-436 to 752°F) ±0.5°CR -50 to 1768°C (-58 to 3214°F) ±1.0°CS -50 to 1768°C (-58 to 3214°F) ±1.0°CE -200 to 1000°C (-328 to 1832°F) ±0.5°CB 260 to 1820°C (500 to 3308°F) ±1.0°CN -230 to 1300°C (-382 to 2372°F) ±1.0°CNote 1: Accuracy is given with CJC switched off.

Relative inaccuracy with CJC enabled may increaseby ±0.5°C.

Thermocouple Break DetectionTC sensor failure can be configured for either upscaleor downscale. Selection applies to all channels.

n DC Millivolt InputMillivolt Input Ranges±100mV DC.

Millivolt Input Accuracy±0.1% of input range.

n Discrete OutputOutput TypeFour independent open drain MOSFET switches with acommon return that operate as low-side switches.

Output Voltage Range0 to 35V DC, 1A DC maximum for each output.External voltage source required.

Output ON Resistance0.15 ohms maximum.

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

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

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

Read CoilRead Holding RegistersRead Input RegistersForce Single CoilPreset Single Register Force Multiple CoilsPreset Multiple RegistersReport Slave IDReset Slave

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

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

Supply CurrentSupply Current Draw10V DC 100mA maximum24V DC 45mA maximum24V AC 85mA rms maximum

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

924MB-0900Thermocouple/millivolt input module900C-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-B01Optional terminal block kit, barrier strip style, 2 pcs.(Does not include terminal block for input wiring.)TBK-S02Optional terminal block kit, spring clamp style, 2 pcs.(Does not include terminal block for input wiring.)PS5R-VB24Power supply (24V DC, 2.1A)

TC INPUT

ANALOG INPUT CONNECTIONS

TB1/TB2

IN+

VOLTAGE

IN-

SOURCE -

+ TB1/TB2

IN+

IN-

DIG

ITA

LO

UT

PU

TS

45

46

TB4

OUT3

RTN

DIGITAL OUTPUT

TB

4

RTN

OUT2

OUT1

44

43

42

36

41

TB3

OUT0

11

TB1

12

CJ

C-0

13 IN0+

IN0-

14

15

16

IN1+

IN1-

INP

UT

S0,1

CJ

C-1

TB2

21

IN3+

IN3-

25

26

24 IN2-

23 IN2+

22

INP

UT

S2,3

D

COMCOM

D

RS

48

5

33

34

35

31

32

A

B

PW

R

TB

3

TB

1

ANALOG�INPUT

ANALOG�INPUT

TB

2

AC/DC�POWER

NETWORK�COMMUNICATION

VOLTAGE INPUT

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

UP TO 35V DC

MECHANICAL�RELAY INTERFACE

+

RTN

OUT

8400100.qxp 3/20/2006 3:18 PM Page 63

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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

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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

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M o d b u s I / OM

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■ 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