DIFFERENCE between pnp and npn sensor

 today we discuss about pnp and npn sensor.

Definition of PNP and NPN Sensor?  The outputs of the digital sensors behave like transistors because when a sensor detects an object, it will trigger the internal transistor that controls the output (which essentially acts as a switch) and, depending on its design, it will act as an NPN type transistor.  or pnp. An NPN output is commonly called a "sinking" output.

3-WIRING PNP + 24Vdc 3-WIRING PNP SENSOR RELAY OR CONTACTOR WITH LOW ENERGY CONSUMPTION 24 V DC COIL  NPN  "WHAT IS PNP AND NPN SIGNAL"?


We should not confuse PNP / NPN with NA / NF.  PNP type sensors can be normally open (NO) or normally closed (NC) as well as NPN type sensors can be NA or NC.  In the case of a PNP NA type sensor, when it is in a normal situation, without object detection, there will be no current flowing to the load.  Then, when an object approaches the sensor, the transisitor will act as a switch providing the positive pole for the load causing the current to flow in the load.


PNP WIRING + 24 Vdc 3-WIRE PNP SENSOR + 24 +vdc The sensor wires have standard colors  internationally, which in the  represented by  (Brown), Pr (Black) and Az (Blue);  As a rule, the Brown (Ma) wire is always positive (Ex: 12V, 24V).  In turn Blue (Az) is always the negative wire (0 V) and the Black wire (Pr) is the return.


STILL Thus, when the sensor detects an object, the return will supply the negative pole (0 V) for the load which in turn will need the positive point so that the current can flow through it.  On the other hand, a sensor with PNP output is commonly called a source or "sourcing" because when it detects an object, it will supply the load with the positive pole (+ 12V, + 24V, etc.)



.