AB PLC with OPC server using Modbus TCP

mbreddy

Member
M
Join Date
Nov 2014
Location
bangalore
Posts
22
Hi,
I have some ladder application which controls motor drive.Right now i have connected PLC with KepexServex with ethernet tcp/ip.Now i have a question.I wanted to change the communication btw PLC to Kepex to Modbus RTU.I need to understand what kind of changes required in PLC coding part to make the communication works.

Assume that I am using O0.1 pin from PLC to start/stop motor. I can configure this bit in Kepex as O0:0/0. I dont know how to expose this bit in kepexserver when communication is modbus.

Please guide me.
 

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