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I have been trying to get a tsx micro 3722001 to connect to a red lion hmi. i did manage to get them communicating but when the hmi was plugged in i couldn't connect to the plc with my pc, unplug the hmi and it worked fine for about an hour then i tried to connect to the plc again via my pc and it just keeps failing. i was hoping somebody might have an idea of what to do before i bin the plc, i've tried different leads different pcs, i don't have any error lights, also the hmi can still communicate with the plc.