How do you wire a NPN sensor to a PLC?

NPN Wiring The black wire of our sensor is connected to the PLC input. The common point of the PLC input and the brown wire is connected to the 24VDC supply. The blue wire of our sensor is connected to the 0VDC supply. You can see that when the proximity switches, the sensor then connects the load to 0VDC.

Can we use NPN sensor instead of PNP?

The selection of a PNP sensor relative to an NPN sensor is determined by the nature of the circuit the device is to be used in. When used in a traditional relay type control circuit, it is normally possible to use either the PNP or NPN type.

What is NPN and PNP in PLC?

NPN = Switched Negative. “Switched” refers to which side of the controlled load (relay, small indicator, PLC input) is being switched electrically. Either the load is connected to Negative and the Positive is switched (PNP), or the load is connected to Positive and the Negative is switched (NPN).

How do I know if my PLC is NPN or PNP?

Power on the system and carefully measure the voltage between 0V and the black wire. If there is a voltage of +24V when the sensor is active, it is a PNP-type sensor. If there is a 0V reading on the multimeter when the sensor is active, it is most likely an NPN sensor.

How do I know if my sensor is NPN or PNP?

What is the output of NPN sensor?

An NPN output is commonly called a “sinking” output. When the sensor senses an object it will connect the output to the negative supply. A PNP output is commonly called a “sourcing” output. When it senses an object it will connect the output to the positive supply.

What is PLC sensor?

Sensors are devices that either measures a physical quantity or detects it. In PLC automation, a sensor must be a transducer who can convert a physical quantity into an electrical quantity.

Where are NPN sensors used?

NPN sensors are used in high-speed applications because they are faster than PNP sensors. They also find more applications in relay circuits than PLC circuits.

How do NPN sensors work?

NPNs. From a practical standpoint, NPN transistors (sometimes called “sinking sensors”) amplify a positive signal applied to the base by allowing a larger current to flow from the collector to emitter pins of the device, proportional to the base voltage.