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By LeonMötter · Posted
Thanks for all the responses. turns out the problem was more hardware related (maybe). i opened the PLC up en took the jumpers for the analog inputs off and back on again. After that the problem was gone. Could it have that one of jumpers had a lose connection and the value i saw in the debugger was jumping between 4-20 mA and either a thermo koppel or PTC input? -
In case you haven't done so, check the power supply is actually supplying 24v during the plcs trying to run. And in doing so, disconnect everything else that runs from the same supply. It might be a short somewhere else that is shutting down the supply. And a later PS to further explain. One of the infrequent supply failures I've had over the years gave tiny amounts of 24 out without load, leading one to think that the supply was ok. Loading it up however, and it dropped right off. But such behaviour initially points to the supply reacting to a short. I finally isolated it by trying another supply, that then worked everything perfectly. -
And......since your last download have you done a full Init & Reset? Something else to try as well if all the above fails. In the ladder, disable all those network comms in your program before doing the stop, and then set them to a test number/0 etc. Maybe those details get hung onto vigorously by the plc, even during stop. cheers, Aus
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