It looks like the main power switch should be a maintained switch of some kind, a PB is not going to be maintained, I assume the other N.C. PB is a twist lock maintained E-stop button, these will be N.C. when released, in this case it is shown right.
I would think the extra opto's a bit redundant, have you tried the LED in series with the Opto diode or even in series on the output side?
Al.
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CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |