PNP and NPN switching signals of the sensor (2)

PNP and NPN sensors generally have three lead lines, namely the power line VCC (power supply positive), 0V line (power supply negative), and Out signal output line.
In practical applications, the PNP type is commonly used, that is, the high-level active state; NPN is rarely used.

PNP means that when a signal is triggered, the signal output line out is connected to the power line VCC, which is equivalent to the power line outputting a high level.

a. For PNP-NO type:

When there is no signal trigger, the output line is suspended, that is, the VCC power line and the out line are disconnected.

When a signal is triggered, it sends out the same voltage as the VCC power line, that is, the out line is connected to the power line VCC, and outputs a high level VCC.

b. For PNP-NC type:

When there is no signal trigger, the same voltage as the VCC power line is issued, that is, the out line is connected to the power line VCC, and a high-level VCC is output.

When a signal is triggered, the output line is suspended, that is, the VCC power line and the out line are disconnected.

Any interest about our UPS1 intelligent pressure switch and UPS2 electronic pressure switch, feel free to contact Stella Meng.