Programming modbus/tcp channel commands, Chapter – FANUC Robotics America GFK-1541B User Manual

Page 116

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GFK-1541B

4-1

Programming Modbus/TCP Channel Commands

This chapter describes how to program communications over the Ethernet network using
Modbus/TCP

®

Channel commands. Details of the Communications Request (COMMREQ)

function and the Modbus/TCP Channel commands are presented here. To program SRTP
Channel commands, see chapter 3. To use the Modbus/TCP Server capability within the Ethernet
Interfact, consult Appendix E about translating PLC reference memory addresses to Modbus
Register addresses.

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The Communications Request

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The COMMREQ Function Block and Command Block

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Modbus/TCP Channel Commands

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Status Data

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Controlling Communications in the Ladder Program, which includes an example

Note

This chapter applies only to Series 90-30 Ethernet Interface IC693CMM321-FH
or later.

This chapter applies only to PLCs being used as client PLCs to initiate
Modbus/TCP communications. No programming is required for Modbus/TCP
server operations, however it is necessary to use the “Modbus Register to
IC693CMM321 Reference Table Translation” provided in Appendix E to
correctly address PLC reference memory using Modbus/TCP to a
IC693CMM321.

4

Chapter

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