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  1. midou33

    Error communication REF542 plus

    Hi geys , I'v communication problems between REF542 plus and PLC , and the status on HMI indicate IBB Error I've red LED 'Ibb error' in HMI of ABB Ref 542plus. When I reset the Modbus communication board in the first and the second Ref 542plus the LEDs 'Ibb error' becomes green. In the third...

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