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  1. august7

    Redundant Modbus serial slaves from GE PLC

    I am planning to connect to a GE Fanuc 90-30 PLC using dual serial ports to my RTU for which I am writing the code. I assume the PLC is a hot backup system (HBR redundancy) with 2 CPUs and I plug a serial cable each to each CPU serial port. I plan to make my RTU the master and the PLCs slaves...

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