Can someone help me, I am using a PLCM BOB is states 12 V for the switches. I am trying to use PNP type NO 6 to 36 volt proximity sensors.
I have determined that I need to add a resistor to the signal on the BOB.

Can someone help me to determine the size resistor I should used and confirm that PNP types should be connected to the input signal.

Thank you for looking