Complaint
The proximity switch has a difference between two wires and three wires. Three wire proximity switch is divided into NPN type and PNP type. They have different wiring modes.
The wiring of the two-wire proximity switch is relatively simple. The proximity switch is connected in series with the load and then connected to the power supply.
Wiring of three-wire proximity switch: red (brown) wire is connected to the positive end of the power supply; the blue wire is connected to the 0V end of the power supply; the yellow (black) line is the signal line, which should be connected to the load. The other end of the load shall be connected to the positive end of the power supply for the NPN-type proximity switch, and to the 0V end of the power supply for the PNP-type proximity switch.
A load of proximity switch can be a signal lamp, relay coil, or digital input module of PLC.
