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Communication error (#0), logout performed,please check if plc is connected

  • arasu18996

    arasu18996 - 2022-02-18

    I was trouble in last two days with this codesys login problem...i have attached reference picture.. can anyone help me to how to fix this error

  • jurr

    jurr - 2022-03-24

    Are you in simulation mode or is there a PLC connected to your laptop via USB? If the latter is true, go to Device Manager > Ports and check at which COM port the PLC is connected. Once you've determined the COM port go to Codesys > Online > Communication parameters. You can change the COM port by double clicking it. Good luck!


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