Ron Beaufort
Lifetime Supporting Member
well, as I said, the "bleeder resistor" idea is a long shot ... IF (that's a big IF) the power supply is indeed "floating" then the resistor might work ... but if that's NOT your problem then you need some kind of game plan as to how to proceed ... as near as I can tell from here, you have at least five logical areas in which to look for the problem – based on the assumption that the system DID indeed work at some point in the past ....
(1) something has changed in the PLC program ...
(2) something has changed in the PLC hardware ...
(3) something has changed in the system wiring ...
(4) something has changed in the power being supplied ...
(5) something has changed in the field instrumentation device ...
rather than simply saying that nothing has changed in any one of these, how much time/trouble would it take to actually TEST each of these items and then be able to conclusively eliminate them one-by-one from the list of potential candidates? ...
(1) something has changed in the PLC program ...
(2) something has changed in the PLC hardware ...
(3) something has changed in the system wiring ...
(4) something has changed in the power being supplied ...
(5) something has changed in the field instrumentation device ...
rather than simply saying that nothing has changed in any one of these, how much time/trouble would it take to actually TEST each of these items and then be able to conclusively eliminate them one-by-one from the list of potential candidates? ...