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I am still new to M580 and getting Modbus over TCP/IP working. I got read register (code 03h) to work but cannot get write to coil (code 05h) using function block DATA_EXCH to work. Here are my code samples along with the M580 manual references I am using and the protection relay I am writing to a 1 bit register ("coil"), if someone can pinpoint the error:
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