An Easy Way to Remember PNP and NPN Sensor Wiring

Posted on February 14, 2018 by

Here’s a simple way remember how to wire up a 3-wire DC PNP or NPN sensor:

PNP = Switched Positive

NPN = Switched Negative

“Switched” refers to which side of the controlled load (relay, small indicator, PLC input) is being switched electrically. Either the load is connected to Negative and the Positive is switched (PNP), or the load is connected to Positive and the Negative is switched (NPN). These diagrams illustrate the differences between the two connections.

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2.14.2018_PNP v NPN Graphic

 

About Henry Menke

I have an electrical engineering background that provides me with a solid technical foundation for my current role as Product Marketing Director.
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