engMoH

This isn't a valid PLC Address, or PLC is busy ??

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when i try to upload a code to m340 it give me this message 

"This isn't a valid PLC Address, or PLC is busy , or media is off."

whatever i use usb or tcp/ip port, it don't always give me the message but most of the time it does and i have to unplug and replug the cable many time until it upload the code, i am sure it's not a cable problem what can it be?

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Well with usb you have to wait for the driver to load after plugging in cable. It takes a few seconds. You should see a icon popup on the bottom right of windows when usb driver is ready

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cHud provides right answer. First, after you plug the PLC, you can check if device was recognized by  Windows and starts the USB driver, only than UnityPro will get the connection to PLC.

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