Honeywell 51198947-100H1 电流将从发射极流向集电极和基极

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Honeywell 51198947-100H1

PNP传感器的工作原理相反——当传感器被激活时，信号端子将有电压;当传感器未激活时，信号将为零伏。晶体管也是如此。对于PNP晶体管，当基极具有足够的电流路径时，电流将从发射极流向集电极和基极。

因为传感器的功能会根据传感器是PNP还是NPN而变化，所以了解您使用的传感器类型非常重要。由于晶体管的内部结构是两个相反的二极管，如果使用了错误类型的传感器，来自PLC的电流就无法流动。因此，如果使用了错误的传感器类型，信号将总是显示为“假”或“低”。

Honeywell 51198947-100H1

The working principle of PNP sensors is opposite – when the sensor is activated, there will be voltage at the signal terminal; When the sensor is not activated, the signal will be zero volts. The same goes for transistors. For PNP transistors, when the base has sufficient current path, the current will flow from the emitter to the collector and base.

It is important to know the type of sensor you are using because the functionality of the sensor varies depending on whether the sensor is PNP or NPN. Due to the internal structure of the transistor being two opposite diodes, if the wrong type of sensor is used, the current from the PLC cannot flow. Therefore, if the wrong sensor type is used, the signal will always display as “false” or “low”.