Siemens PLC Modbus Communication with Com Module CM PtP

kevinlin_5

Member
K
Join Date
Mar 2016
Location
Singapore
Posts
13
Dear All,



I have a question about the modbus communication with CM PtP. I'm using a power meter to measure current/ voltage/ power, and the measured results are sent to the remote IO (RIO) with CM PtP through modbus communication. This didn't work. But if I connect an extra set of wire from the signal wire to the PC USB port via Serial-to-USB converter, it works fine. Does anybody has any idea about this problem?



Thanks.
 

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