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How can I cable to the PNP and NPN type outputs for sensors / detectors, using the wiring diagram?
PNP and NPN type outputs are available as 3-wire sensors with a DC voltage power supply (the voltage limits are dependent on the specific sensor):
PNP type: switching on the positive voltage load
NPN type: switching on the negative voltage load
These outputs are typical of photoelectric detectors, inductive proximity and other types of sensors.

For a detailed explanation of PNP vs NPN, see the following FAQ: FA142566
PNP output
The load (relay coil, contactor relay input, PLC input) must be connected between the "-" negative terminal and the midpoint.
The corresponding PLC input is Sink.
NPN output
The load must be connected between the "+" positive terminal and the midpoint.
The corresponding PLC input is Source.

PNP VS NPN Wiring Diagram
Some sensors have two PNP and NPN outputs (4-wire sensors) which are wired according to the diagram below.

PNP AND NPN WIRING DIAGRAM

Note that wiring diagrams can be found on the instructions provided with / for a sensor, or in the catalogue. All this documentation is found online at www.se.com or www.tesensors.com

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