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    Connection lost between the Unity-Pro PC and the PLC just after the Run command through the USB driver

    Goals and Symptoms

    The Unity-Pro project is transferred through the USB port and the connection is lost just after the Run command.
    The animation remains frozen and the following message is displayed :
    "PLC failed - Automatic return to off line"

    The PLC remains in Run mode, every time you try to connect it again the same message is displayed.

    Causes and Fixes

    The connection is lost because the project has a long Scan Time and the request takes more time than the driver timeout to get an answer.

    You have to change the timeout of the driver, for that :
    - Under Unity-Pro, select in the menu PLC -> Set Address,



    - In the PLC area, click on the "Communication Parameters" button,


    You can increase the Timeout to 10 seconds in order to stay connected.

    -Click OK to validate.
     

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