What is the difference between PNP and NPN when describing What is the difference between PNP and NPN when describing 3 wire connection of a sensor Solid state electronic components such as transistors are used to switch the output of the sensor upon detection to identify the type of sensor to be used with the PLC card based on the PLC manufacturer's documentation and / or wiring diagrams. An Easy Way to Remember PNP and NPN Sensor Wiring 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), Continue reading "An Easy Way to Remember PNP and NPN Sensor Industrial Sensing Fundamentals – Back to the Basics: NPN The switching logic PNP or NPN are not related to the supply voltage of the sensor or the operating voltage of the input. Referring to the NPN wiring diagram above, note that the sensor supply voltage and the high side of the load are connected to the same point and are therefore at the same voltage. Here’s a Quick Way to Wire NPN and PNP devices | Acc Here’s a Quick Way to Wire NPN and PNP devices. I get asked often on how to wire NPN and PNP devices to the programmable logic controller. This can be confusing at first when looking at the wiring diagrams. The following is a wiring diagram of an open collector PNP sensor. Prox Switch Wiring Diagram (Normally Open sensor will work Normally Open) Wiring Diagram for NPN and PNP 3 wire sensors with the DND TECHNOTES Product group: series Information Type: 16 point DC input module. Wiring Instructions for the MICRO SWITCH VPX Series Valve Position Indicator for Hazardous Locations Sensing and Internet of Things Issue A WIRING DIAGRAMS Figure 1. 3- and 4-Wire DC PDF filePNP Normally open Brown Black Blue Load ( ) ( ) E3 PNP Normally closed Brown Black Blue Load ( ) ( ) 4-Wire DC Cable Connection Note: Wiring diagrams show quick disconnect pin numbers. Quick Disconnect A0 (+) (–) Brown Black White Blue NPN Normally Open and Normally Closed N.C. Load Male Receptacle End View N.O. Load NPN Normally open 1 Brown How to Wire a Proximity Sensor to a PLC The term common refers to a (+/-) reference polarity of a PNP or NPN configuration. A common wire is used to reduce the number of terminal connections made between sensors and a PLC. This wire is noted on the I/O module’s wiring diagram. PNP sensor outputs switch in a positive (+) fashion. 0 DC power 4 1 supply 5 2 6 3 7 0 - AutomationDirect PDF fileWiring Diagram for NPN and PNP 3 wire sensors with the D2-16ND3-2 TECHNOTES Product group: 205 series Information Type: 16 point DC input module Last revised : 15 Feb, 2002 Document Name: NPN_PNP 3wire sensors FAQ Please refer to our tech support website for more info on sensors. The FAQ section may have information that can help. Wiring NPN and PNP Sensors into the PLC with an When wiring NPN and PNP sensors, we cannot mix them together with the same common input point of the PLC. This is because in an NPN connection the common input point will be at 24VDC.