In this video we will learn about PNP and NPN in proxmity sensor. PNP and NPN Sensor is very important in understanding Proximity switch. PNP sensor and NPN sensor is just about wiring methods and it explained the concepts of sinking. Photoelectric sensor and inductive sensor uses PNP and NPN output and you have to select pnp and NPN sensor according to your requirements.
NPN and PNP Output depends on the type transistor used in trigger circuit of sensor. It can be NPN or PNP. Connections changes when we wire a PNP type sensor and NPN type sensor.
A sensor can also have PNP and NPN output too:) but in most cases they are different models.
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