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thanks Alan

fault out from the manual
TTL level (+5 V) output becomes high when power devices are disabled due to at least one of the following conditions: inhibit, output short circuit, over voltage, over...

thanks alan xr8, didn't think of using the opto board to reverse from 5v to 24v for the fault .
how did you wire them up for the fault, ?

little info to start controller is a cs-labs csmio/ip-a with amc 25a20 drives.
the ip-a manual shows a basic wiring diagram wih a pilz pnoz x7 safety relay.
so the ip-a need 24v input.so 24v to...