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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.
The Communications Request
The COMMREQ Function Block and Command Block
Modbus/TCP Channel Commands
Status Data
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