modicon ACO 130 00 output card


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I'm using a ACO 130 00 8 point high density analog output card with 8 I/P transducers. when trying to operate one of the I/P's the current drops on all the other points, has anyone seen this before, or has any ideas. I have changed the I/P's, the output card, rang out the wire, checked grounding, and changed out the power supply! I'm stumped! We use these same cards with the same setup all over are plant with no problems, could this be a problem with the backplane?