Which output method do you need: PNP or NPN? How to distinguish between normally closed contacts and normally open contacts? We will explain to you.
PNP output (+24V DC source output)
PNP output (+24V DC source output): The load is connected to the switch output and the common ground (-). This type of output is widely used in Europe and North America.
NPN output (0V DC down output)
NPN output (0V DC falling output): The load is connected to the switch output and reference point (+). This type of output is widely used in Asia.
Normally open contact (NO)
NO = normally open = normally open contact
The sensor is “on” when it recognizes the target. This principle is most widely used in automation technology.
Normally closed contact (NC)
NC = normally closed = normally closed contact
The sensor “disconnects” when it recognizes the target.
Complementary contact (NO + NC)
NO + NC = complementary
The sensor provides two signals. When the target is recognized, the two outputs are switched.