10/12/2012 2:20 AM | |
Joined: 3/28/2010 Last visit: 9/21/2024 Posts: 1056 Rating: (213) |
Ohhhh. Now I understand your first post, with the multiple PLC model numbers. You have two analog inputs, each on a different PLC in series with the analog output from the OCM III. The differing ground potentials at the OCMIII, the first PLC and the 2nd PLC are creating a ground loop problem. The simplest solution is to get a signal splitter, with a single analog input from the OCM, and two, isolated analog outputs that 'follow' (reproduced) what is on the input. Run one analog signal to the first PLC, run the 2nd analog signal to the second PLC. I use API's APD 4394, http://api-usa.com/pdf/api/apd4393.pdf |
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