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

Modbus/rs485 network i/o modules
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Acromag BusWorks 900MB Series User Manual

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  • Page 1 (217) 352-9330 | Click HERE Find the Acromag BusWorks 917MB-0900 at our website:...
  • Page 2 Model 918MB-0900 Quad Voltage Output 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. 8500-633-J12F005...

  • Page 3: Table Of Contents

    Acromag, that this is the Buyer’s responsibility. The information contained in this manual is subject to change without notice. Acromag, Inc., makes no warranty of any kind with regard to this material, including, but not limited to, the 1.0 INTRODUCTION implied warranties of merchantability and fitness for a particular purpose.

  • Page 4: Key 917Mb/918Mb Features

    The following accessories are available from Acromag. long distances, and allows a large number of modules to be Acromag also offers other standard and custom transmitter types networked together. The unit communicates using the to serve a wide range of applications (please consult the factory).

  • Page 5: Interface Cable

    For repairs to a product damaged in LED flashes ON/OFF to indicate the module is in the Default shipment, refer to the Acromag Service Policy to obtain return Communication Mode with a fixed module address of 247, baud instructions.

  • Page 6: Software Installation

    10. Now click on the [Acromag 900MB] program folder icon at IMPORTANT – Protection With Inductive Loads: The the bottom of your windows screen, then click on the...

  • Page 7: Register Map

    ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ Model 917MB-0900 and 918MB-0900 Register Map REGISTER MAP Addr. Description Data Type/Format Input Registers (3x References, Read-Only) Modbus registers are organized into the following reference 3 0001 Module Bit 15: Flash Checksum types identified by the leading number of the reference address:...
  • Page 8 ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ Model 917MB-0900 and 918MB-0900 Register Map Model 917MB-0900 and 918MB-0900 Register Map Addr. Description Data Type/Format Addr. Description Data Type/Format Holding Registers (4x References, Read/Write) Holding Registers (4x References, Read/Write) 4 0011 CH 1 Percentage (%) –...

  • Page 9: Module Calibration

    ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ Notes (Register Map): Model 917MB-0900 and 918MB-0900 Register Map Note that the Report Slave ID and Reset Slave functions do Addr. Description Data Type/Format not operate on Register Map locations. Output values are indicated in percent-of-span units Holding Registers (4x References, Read/Write) represented by a 16-bit signed integer value with resolution...

  • Page 10: An Introduction To Modbus

    ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ After writing the required values to the Cal Low & Cal High A master’s query is comprised of a slave address (or registers of the output, new output calibration takes effect broadcast), a function code defining the requested action, any immediately following a module reset.
  • Page 11 ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ Modbus Addresses The master’s application program must handle the exception response. It may choose to post subsequent retries of the The master device addresses a specific slave device by original message, it may try sending diagnostic messages to the placing the 8-bit slave address in the address field of the slave, or it may simply notify the operator an exception error has...
  • Page 12 ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ The Read Input Registers query specifies the starting register and quantity of registers to be read. Note that registers are addressed starting at 0--registers 1-16 are addressed as 0-15. Coil The Read Input Registers response message is packed as Read Holding Registers (03)
  • Page 13 ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ The Force Single Coil response message is an echo of the The ON/OFF states are specified by the contents in the query query as shown below, returned after executing the force coil data field.
  • Page 14 Reset Slave Example Query This command returns the model number, serial number, and Field Name Example Value (Hex) firmware number for the Acromag slave device, the status of the Slave Address 247 (F7) Run indicator, and any other information specific to the device.
  • Page 15 A/D count, a DAC count, or a time value with a range of –32768 to +32767. selection. The Acromag device will actually work with 1 or 2 stop Percentage A 16-bit signed integer value with resolution bits with no parity selected.

  • Page 16: Module Software Configuration

    ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ The exclusive OR result is shifted in the direction of the least In an exception response, the slave sets the msb of the significant bit (lsb) of the CRC, with a zero placed into the most function code to 1 in the returned response (i.e.
  • Page 17 ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ Starting The Program After clicking on the Series 900MB program icon to boot the Configuration Program, a screen similar to the one at right will be displayed. To begin, click the “Settings-Serial Communications…”...
  • Page 18 ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ 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 19 ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ Watchdog Timeout States/Values Click on the “Watchdog Timeout State 0 & 1”, or “Watchdog Timeout State 2 & 3” property sheet tabs and a screen similar to the one at right will be displayed.
  • Page 20 ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ Testing Your Configuration The “Test” portion of this program allows you to monitor polling, monitor module status flags, restore factory calibration, reset the module, monitor output ranges and values, and control or monitor output levels and states.

  • Page 21: Output Calibration

    ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ OUTPUT CALIBRATION Selecting the Output Cal property sheet will display a screen similar to the one shown at right. Note: Calibration of the analog output has already been done on your module at the factory.

  • Page 22: Theory Of Operation

    (current or voltage), plus four to Acromag for repair. The board can be damaged unless special open-drain output switches, and provide an isolated SMT repair and service tools are used. Further, Acromag has RS485/Modbus network interface.

  • Page 23: Anlog Output Specifications

    ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ Current Output Register Program Value 917MB: Transmits up to four DC current output channels, plus Output Current four digital outputs. Range 12mA 20mA 918MB: Transmits up to four DC voltage output channels, plus 0-1mA 20000 four digital outputs.

  • Page 24: Digital Output Specifications

    ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ Table 3: Analog Output Range Resolution & Accuracy Case Material: Self-extinguishing NYLON type 6.6 polyamide thermoplastic UL94 V-2, color beige; general purpose NEMA Calibrated Effective Accuracy Type 1 enclosure. Out Range Resolution Percent-of-Span...

  • Page 25: Communication Interface Specifications

    ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ Installation Category: Design to operate in an Installation in a Some signal converters or host/software systems cannot Pollution Degree 2 environment with an installation category accept an immediate response from the slave without (Over-Voltage Category) II rating.

  • Page 26: Software Configuration

    ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ LED Indicators: Analog Output Run (Green) - Constant ON indicates power applied and unit Output – Range/Type: is operating normally. Flashing ON/OFF indicates unit is 917MB: Select DC current output ranges 4-20mA, 0-20mA, performing diagnostics (first second following power-up), or 0-1mA.

  • Page 27: Simplified Schematic (4501-828)

    ® BusWorks Model 917MB/918MB Network I/O Module User’s Manual Quad Current/Voltage Output ___________________________________________________________________________________________ OUTPUT STATUS OUT+ V-TO-I 10-36V DC CONVERTER 24VAC 12-BIT POWER - VOLTAGE PWR LED ISOLATED AMPLIFIER FLYBACK STATUS LED ISOLATED POWER OUT+ OUT PWR V-TO-I RS485 PWR CONVERTER 12-BIT VOLTAGE...

  • Page 28: Network Connections (4501-805)

    44 43 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 CJC-0 INPUTS 0,1 CJC-1 INPUTS 2,3 DIGITAL IN or OUT...

  • Page 29: Interposing Relay Conn. & Contact Pro. (4501-832)

    REVERSE EMF THAT IS GENERATED WHEN CURRENT THROUGH THE INDUCTOR (RELAY COIL) IS TURNED OFF. SHIELDED CABLE INPUT CONNECTIONS (SEE DRAWING 4501-831) 4501-832A Acromag 46 45 44 43 "T" RAIL DIN MOUNTING DIN EN 50022, 35mm DIGITAL OUTPUTS RS485 MODEL 918MB-0900 SHOWN...

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