The difference between PNP and NPN

上海臬克

The difference between PNP and NPN [Copy link]

1. PNP

PNP means that when there is a signal trigger, the signal output line out is connected to the power line VCC, which is equivalent to the power line outputting a high level.
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 .
For PNP-NC type:

When there is no signal trigger , it emits 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 .

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

2. NPN type

NPN means that when there is a signal trigger, the signal output line out is connected to the 0v line, which is equivalent to outputting a low level, 0v.

For NPN-NO type:

When there is no signal trigger, the output line is suspended, that is, the 0v line and the out line are disconnected.

When a signal is triggered, a voltage equal to OV is emitted, that is, the out line is connected to the 0V line, and the output is a low level OV.
For NPN-NC type:

When there is no signal trigger, the same voltage as the 0V line is emitted, that is, the out line is connected to the 0V line, and the output is a low level 0V. When there is a signal trigger, the output line is suspended, that is, the 0V line and the out line are disconnected.

This article is reproduced from Zhihu Caishuxueqian

秦天qintian0303

Basically the control signals are opposite

端起郭场鸡就跑

I thought it was a triode, I learned

beyond_笑谈

Pick up Guochang Chicken and run away. Posted on 2024-9-2 14:32 I thought it was a triode. I learned it.

This is actually similar to the transistor NPN/PNP, which is the DO output type of the PLC.