Al the Man,
Thank you for respond.
Sorry, I’ve forgotten to mention the IC has four terminals. The 1 is +24DC input, the 4 is ground (0 V), the 2 is the output? with diodes: 2 diodes connected to anodes and 1 diode – to its cathode. And the 3 terminal seems to be a loop back and connected via resistor of very small size (small current).
Sorry for being persist, I believe I can fix this FX1S PLC and have spare unite. |