Acromag BusWorks 900MB Series User Manual
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Acromag BusWorks 900MB Series User Manual

Modbus/rs485 network i/o modules, digital input/output with sinking outputs and active-low inputs
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® ® ® ®
BusWorks
900MB Series
Modbus/RS485 Network I/O Modules
Model 901MB/902MB/903MB Digital Input/Output
With Sinking Outputs And Active-Low Inputs
USER'S MANUAL
ACROMAG INCORPORATED
30765 South Wixom Road
P.O. BOX 437
Wixom, MI 48393-7037 U.S.A.
Tel: (248) 295-0880
Fax: (248) 624-9234
Copyright 2000, Acromag, Inc., Printed in the USA.
Data and specifications are subject to change without notice.
8500-631-J12F005

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Summary of Contents for Acromag BusWorks 900MB Series

  • Page 1 With Sinking Outputs And Active-Low Inputs USER’S MANUAL ACROMAG INCORPORATED 30765 South Wixom Road P.O. BOX 437 Wixom, MI 48393-7037 U.S.A. Tel: (248) 295-0880 Fax: (248) 624-9234 Copyright 2000, Acromag, Inc., Printed in the USA. Data and specifications are subject to change without notice. 8500-631-J12F005...

  • Page 2: Table Of Contents

    The information contained in this manual is subject to change Acromag, that this is the Buyer's responsibility. without notice. Acromag, Inc., makes no warranty of any kind with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose.

  • Page 3: Key 903Mb Features

    The following accessories are available from Acromag. non-volatile, downloadable flash memory and EEPROM. Acromag also offers other standard and custom transmitters and This allows the functionality of this device to be reliably alarms to serve a wide range of applications (consult the factory).

  • Page 4: Preparation For Use

    For repairs to a product damaged in A push-button default mode switch (DFT) and status LED are shipment, refer to the Acromag Service Policy to obtain return provided at the front of the module as a convenient way of instructions.

  • Page 5: Pullup Installation & Removal

    BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ Pullup Installation & Removal (See Drawing 4501-811) It is recommended that I/O, network, and power wiring be separated for safety, as well as for low noise pickup. Note that Sockets are installed on the board to accept SIP resistor I/O, network, and power terminal blocks are an industry-standard networks for optional I/O pullup installation.

  • Page 6: Software Installation

    00012 000B) Outputs 0-11 a 16-bit word that controls/ 10. Now click on the [Acromag 900MB] program folder icon at (903MB & monitors the ON/OFF the bottom of your windows screen, then click on the 902MB Only)
  • Page 7 BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ Model 903MB-0900 Register Map…continued Model 903MB-0900 Register Map…continued Addr. Description Data Type/Format Addr. Description Data Type/Format Contact Registers (1x References, Read-Only) 40004 Port 0 Can be set from 1 to 65534 (0003) 1 0001 0-11...

  • Page 8: An Introduction To Modbus

    BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ Notes (Register Map)…continued: Model 903MB-0900 Register Map…continued For your convenience, this module mirrors the contents and Addr. Description Data Type/Format operation of 3xxxx registers into 43xxx holding register Holding Registers (4x References, Read/Write) space for systems and controllers that cannot directly 40009 Port 2...
  • Page 9 Note that an additional stop bit is normally transmitted to fill message that tells the master device what kind of error occurred, out the character frame for no parity. Acromag units will accept or the reason for the exception (See Modbus Exceptions).
  • Page 10 BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ The master’s application program must handle the exception To summarize, the status of coils 7-0 is shown as the byte response. It may choose to post subsequent retries of the value AA hex, or 10101010 binary.
  • Page 11 BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ Read Input Status Example Response Read Input Registers (04) Field Name Example Value (Hex) This command will read the binary contents of input registers Slave Address 247 (F7) (3x reference addresses) in the slave device. Broadcast Function Code 2 (02) transmission is not supported.
  • Page 12 BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ Force Single Coil Example Query Force Multiple Coils (15) (902MB & 903MB Models Only) Field Name Example Value (Hex) Slave Address 247 (F7) This command will simultaneously force a sequence of coils Function Code 5 (05) (0x reference addresses) either ON or OFF.
  • Page 13 This command returns the model number, serial number, and Error Check (LRC or CRC) firmware number for the Acromag slave device, the status of the Run indicator, and any other information specific to the device. The normal response returns the slave address, function This command does not address Register Map registers.
  • Page 14 BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ Summary Of Data Types Used By 900MB Modules The Reset Slave query simply sends the slave address, function code, sub-function code, and data (data is ignored and Data Types Description simply echoed back), with error check (CRC LRC).

  • Page 15: Module Software Configuration

    BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ CRC Error Checking Modbus Exception Codes…continued Code Exception Description RTU Mode message frames include an error checking Negative The slave cannot perform the method that is based on a Cyclical Redundancy Check (CRC). Acknowledge program function received in the query.

  • Page 16: Starting The Program

    BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ The following sections guide you through the Configuration Program property sheets used to configure 90xMB I/O Modules. Because these units perform simple digital I/O, configuration is simplified. Property sheets vary slightly between models. Refer to on-line Help if you have trouble understanding parameters unique to your module.

  • Page 17: Creating A Configuration File

    BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ Creating A Configuration File You may use File-New to create a new configuration file, or File-Open to open an existing configuration file. You may also use Module-Upload Configuration to retrieve the current active configuration from the module connected (recommended).

  • Page 18: Testing Your Configuration

    BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ Testing Your Configuration The “Test” portion of this program allows you to monitor polling, module status flags, reset the module, control output states, and monitor input states. This page is also used to configure the port watchdog time and the timeout reset states for the port.

  • Page 19: Theory Of Operation

    Acromag for repair. The board can be damaged unless special If you fail to communicate with the module or have a high SMT repair and service tools are used.

  • Page 20: Specifications

    BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ 6.0 SPECIFICATIONS Inputs include transient suppression devices and series connected 100KΩ resistors, plus diode over-voltage clamps General: Series 901/902/903MB network modules include up to the internal +5V supply. Sockets are provided for to twelve digital inputs (901MB), digital outputs (902MB), or installation of optional SIP resistor networks to act as pullups combined input and output channels (903MB), and provide an...

  • Page 21: Enclosure/Physical Specifications

    The recommended SIP resistor is a four 29mA Typical, 39mA Maximum isolated resistor type (8 pins) and may be obtained from Acromag or another vendor. These SIP resistors 24VAC 72mA Typical, 95mA Maximum typically come rated for 0.2W, 0.3W, or 0.4W per IMPORTANT - External Fuse : If unit is powered from a element.

  • Page 22: Communication Interface Specifications

    BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ COMMUNICATION INTERFACE SPECIFICATIONS Supported Modbus Commands: The command & response protocol for communicating with this module adheres to the These units contain an isolated RS485 communication port Modbus/RTU standard for the following Modbus Functions: for the transmission of data.
  • Page 23 BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ Host Communication In addition, the module status LED will blink rapidly if a Set via the Settings pull-down menu watchdog timeout occurs (Note: A slow blink rate indicates Host – Communications Port: COM1-COM4 can be selected the module is in the default communication mode and a via the scroll window, or you can type in any COM port from timeout may temporarily mask default mode indication).

  • Page 24: Simplified Schematic (4501-809)

    BusWorks® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ 903MB I/O IS RATED TO SIMPLIFIED I/O CIRCUIT 35V & 500mA MAX ISOLATED RS485 PORT INPUT BUFFER CONTROLS & EXC1 MULTIPLEXER OPTIONAL RESISTOR SIP RES SIP PULLUP SOCKET SOCKET (5.6K, 0.4W, 3 PLACES) MICRO RS485...

  • Page 25: Pullup Resistor Sip Locations (4501-811)

    DIGITAL OUTPUTS RS485 DIGITAL I/O RS485 MODEL 906MB-0900 MODEL 924MB-0900 ANY RS232-TO-RS485 CONVERTER acromag (ACROMAG MODEL 4SCC-TTM-X SHOWN) SET BAUD RATE, PARITY, SET BAUD RATE, PARITY, AND ADDRESS AND ADDRESS DIGITAL IN or OUT DIGITAL IN or OUT CJC-0 INPUTS 0,1...

  • Page 26: Electrical Connections

    SHIELDED CABLE OUTPUTS RATED TO 35V/500mA DC INTERNAL OUTPUT EARTH PULLUPS ARE OPEN GROUND 0-35V SHIELDED CABLE EXC1 OUT0 Acromag 0-35V CH 0 RUN/PWR LED (GREEN) OUT1 STATUS LED (YELLOW) 46 45 44 36 35 32 31 CH 1 OUT2...

  • Page 27: Electrical Connections

    BusWorks ® Model 903MB/902MB/901MB Network I/O Module User’s Manual Digital I/O ___________________________________________________________________________________________ DRY-CONTACT RELAY CONNECTIONS - NORMALLY OPEN SOLID-STATE RELAY (SSR) OR LED DRIVER 901MB & 903MB ADJUST VOLTAGE (V) AS 903MB REQUIRED TO CHANGE 5.6K SIP RESISTOR EXCITATION CURRENT( I) SIP INSTALLED INSTALLED OR CHANGE SIP RESISTOR...

  • Page 28: Interposing Relay Conn. & Contact Pro. (4501-814)

    PULL-DOWN RESISTOR SIPS TIED TO THE OUTPUTS. YOU SHOULD REMOVE THESE RESISTOR SIPS FOR APPLICATIONS WIRED AS SHOWN. I/O CONNECTIONS (SEE DRAWING 4501-823) 4501-814B Acromag 32 31 "T" RAIL DIN MOUNTING DIN EN 50022, 35mm DIGITAL IN or OUT RS485...

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