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Genetix GCM Configuration and Troubleshooting for Modbus

Merrick Industries, May 2014

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 1 2014-05-18/Lars

Genetix GCM Configuration and Troubleshooting for Modbus

Both serial ports in a Genetix GCM can be configured to support Modbus ASCII or Modbus RTU.

This allows for establishing direct communications to almost any industrial network, either directly

or using protocol converters. We currently support interfacing to Profibus DP, EtherNet/IP,

Modbus/TCP, Modbus Plus, DeviceNet or ControlNet using this method.

The network host can take control over and/or monitor the GCM, using Common Interface Table

(CIT) data exchange. For details, see http://www2.merrick-inc.com/mct/CIT.pdf

System Requirements

All versions of the Merrick Genetix GCM controller support Mobus ASCII and Modbus RTU

communications protocols. They will act as slaves, supporting Modbus functions 3 (Read Holding

Registers) and 16 (Preset Multiple Registers). Function 8, sub function 0 (Return Query Data) is

also supported.

The physical interface is 4-wire RS-485 or 3-wire RS232. The master is assumed to maintain a

cyclic conversation with the controllers, which exposes a CIT, making it possible to monitor and/or

supervise the GCM completely.

Different data types are used for control/status bits, integer numbers and floating-point numbers.

Control/Status bits and Integer numbers are organized in 16 bit words. Parameters are organized

as IEEE 32 bit floating point numbers, located in two consecutive 16 bit words. For PLC's that

don't support floating point numbers, it is possible to split parameters into two 16 bit integers, one

containing the integer part and one containing the fractional part multiplied by 10,000 (four implied

decimal places).

Configuring the GCM

Configuring the GCM includes setting up communications parameters, register tags, warnings,

faults and external inputs and outputs. The register tags are set to make any internal GCM

parameter appear in Tag 1 R to Tag 5 R values. Standard feeder parameters are always

available. Warnings and faults are user preference qualified, associated with any logical I/O point

in the GCM. This configuration is done regardless if communications is used or not. Any logical

inputs you want to control from the PLC must be mapped to a network input. In the same way,

logical outputs must be mapped to network outputs for monitoring purposes.

It is recommended that you use the built in Terminal Monitoring and Configuration Interface

(TMCI) for setting up, troubleshooting and monitoring the Modbus interface. You need a PC with a

terminal emulator supporting the VT52 terminal protocol, i.e. Hyperterminal, a USB port and a

type A USB cable. Merrick’s service department can help you set this up.The following menu

references and screen shots were taken using the GCM 101.1.7.2 Belt Feeder Controller

application. Operation and Maintenance Manuals as well as register specifications are available at

the Merrick Web Site:

http://www2.merrick-inc.com/mct/GENApps/GENApps.htm

1 2 3 4 5 6 ... 10 11

Transmit 7

Podsumowanie treści

Strona 1

Genetix GCM Configuration and Troubleshooting for Modbus Merrick Industries, May 2014 http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 1 20

Strona 2

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 10 2014-05-18/Lars Rxsta Character receiver state enumeration: 0 Waiting for first UART interrup

Strona 3

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 11 2014-05-18/Lars WaiEnd Counter for ModBus RTU and UISServer telegrams who have had the end co

Strona 4

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 2 2014-05-18/Lars Setting the GCM communications parameters Set up the serial port in TMCI page

Strona 5

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 3 2014-05-18/Lars Parameter Comment C: LnPar UART Line parameter settings, hexadecimal. Bit enco

Strona 6

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 4 2014-05-18/Lars The warning and faults are normally set up using the user interface; Advanced

Strona 7 - Transmit

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 5 2014-05-18/Lars Network Inputs are numbered 1 - 16. Bits in the corresponding PLC word are typ

Strona 8

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 6 2014-05-18/Lars You can also use the RS-232 interface if the GCM is the only slave on the line

Strona 9

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 7 2014-05-18/Lars If you are using one of the recommended protocol converters from Anybu

Strona 10

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 8 2014-05-18/Lars Note that the values are only updated on valid Modbus telegrams.

Strona 11

http://www2.merrick-inc.com/mct/GCMModbus.pdf Page 9 2014-05-18/Lars NewProt Protocol used. 1 or 2 for Modbus. See “Setting the GCM communications

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