Wiring Proxy Switch Input
PNP 3-wire example:
(see attachment for photo)
Brown to C0+
Blue to C0-
Black to the input (such as X1, X2, or X3...)
PNP 4-wire example:
(see attachments for photo)
Brown to C0+
Blue to C0-
BlackWhite to the input (such as X1, X2, or X3...) (this is normally closed which is preferred method. Black can be used for normally open).
https://www.automationdirect.com/adc/Shopping/Catalog/Sensors_-z-_Encoders/Inductive_Proximity_Sensors/18mm_Round_Harsh_Duty/Food_-a-_Beverage_IP69K_(18mm)/PFK1-BP-3H