Thanks Roy. That will work, as I do have 4-20mA outputs. The easiest place for the resistors would be at the PLC, but the distance between the PLC and E/P's could be up to 200 or 300 feet. Any thoughts on that?
I have many old E/P transducer that requires1-5VDC inputs. My PLC voltage output card can supply 1-5VDC, but requires a load impedance of at least 1kohm. The E/P transducer's input impedance is only 333 Ohms. Does anyone have a recommended solution to this problem? (short of replacing the E/P's?)