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EPLC Modbus communication issue.

I am using E+PLC version and software version 1.2.04. I am facing following problem:-

1. Problem of read/write signed integer in E+PLC 400 over RS485 2 wire master.
2. Unable to communicate any slave device without using block "E_MODBUS.RegisterToReal" in channel declaration.

I have been using older version of PLC.
I have never faced such issues.
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