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
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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