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Analog output PLC CQM1H problem

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hi guys, I'm new here, and right now I have a problem with my Analog output PLC Omron CQM1H, the problem is that I cannot find the cause that make my analog output don't work properly.

The output always send the 15V dc signal, all of them, even if there is no input signal. can anyone tell me what may cause that problem? is it the program or the wiring (I think my wiring is perfect) .. thank you.
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