DC two-wire type: Brown line PLC input point com PLC received positive power supply, power negative to the blue line.
NPN type: Brown plugged blue Power, black line received a PLC input points, com is connected to a power supply of the PLC. Type NPN is leaking, when an object is detected low level signal output.
PNP type: Brown plugged blue Power, black line received a PLC input points, com PLC received Power. PNP is the source type, object output high when signal is detected.
PLC ONE 