What you need to know about wiring of sensors
Which output type do you need: PNP or NPN? And what is the difference between normally open and normally closed? We will explain it for you.
Electrical wiring of sensors
PNP output (Sourcing output +24 V DC): The load is connected to the switching output and the common ground (-). This type of output is common in Europe and North America.
NPN output (Sinking output 0 V DC): The load is connected to the switching output and the reference point (+). This type of output is common in Asia.
NO = normally open
The sensor turns "on" when an object is detected. This principle is the most commonly used in automation technology.
NC = normally closed
The sensor turns "off" when an object is detected.
NO + NC = Complementary
The sensor provides both signals. Both outputs are switched when an object is detected.