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Discussion in 'Microcontrollers, Programming and IoT' started by sudhakar, Aug 27, 2017.

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  1. sudhakar


    Jun 19, 2017
    In ship unloader (grab),
    I'm worked in ABB make ac800 plc .
    It include primary and secondary controller, CI 854 drive bus ,
    CI 858 profi bus, ozd repeater and three Remote I/o panels .
    In ship unloader running time no fault accured . But machine standby time PLC indicated fault . Sometime primary indicated fault , another time secondary indicated fault , and another time
    drive bus CI 854 indicated fault . In PLC fault accured time , fault removed after switch off and switch on the PLC power supply .
    my teammates totally upset because this problem frequently coming from two months.
    what is the possible reason to plc created this fault ?
    how to arrest the problem ?
  2. kellys_eye


    Jun 25, 2010
    Change the power supply.
    sudhakar likes this.
  3. Minder


    Apr 24, 2015
    De-couple both local and remote power supplies with decoupling electrolytic cap.
    sudhakar likes this.
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