When connecting to the plc the plc input acts as the load. You will notice that the load appears between the 0v blue and switching wire black.
How To Wire Discrete Dc Sensors To Plc Part 2 Plc
Npn sensor wiring diagram. The sensor led will stay on and go off when activated. Two specific types of 3 wire sensors are available. 25kω wiring diagram to connect npn proximity sensors with internal pull up resistor some npn proximity sensor has a pull up resistor r1 internally. The figure 2 depicts 3 wire diagram of npn sensor. A pnp sensor may be either no or nc as can an npn be. In this video i demonstrate an npn inductive proximity sensor circuit.
The difference is a result of the internal circuit design and type of transistors used. Normally open sensor will work normally open wiring diagram for npn and pnp 3 wire sensors with the d2 16nd3 2 technotes product group. Pnp switched positive npn switched negative switched refers to which side of the controlled load relay small indicator plc input is being switched electrically. Photoelectric sensor works on ir principle and this sensor has 4 wireno and nc in sensor has also been explained4 wire sensor has both no and nc operating mode in it. Npnpnp 3wire sensorsvsd faq. Pnp sensor outputs switch in a positive fashion.
Heres a simple way remember how to wire up a 3 wire dc pnp or npn sensor. 16 point dc input module last revised. Wiring diagram to connect in parallel npn open collector proximity sensors connecting npn open collector proximity sensor with the c11gs r1 value 12v r1 value 24v aprox. A key point to observe is that pnp and npn has nothing to do with whether the sensor is normally open no or normally closed nc ie. 205 series information type. Either the load is connected to negative and the positive is switched pnp continue reading an easy way to remember pnp and npn sensor.
Classification by output circuit. Referring to the npn wiring diagram above note that the sensor supply voltage and the high side of the load are connected to the same point and are therefore at the same voltage. The switching logic pnp or npn are not related to the supply voltage of the sensor or the operating voltage of the input. Npn sensor and its 3 wire diagram this sensor sinks its ground to the output. This classification is based on the type of output circuit and the output voltage. Npn sensor outputs switch in a negative fashion.
Hence it is known as sinking sensor. This means that multiple sensors can be connected to an input card with all sensor negative wires to one common wire. The following is a wiring diagram of an open collector pnp sensor. When an object is placed near the sensor the output device turns on. This wire is noted on the io modules wiring diagram. The 0v blue will be attached to the common input and the switching wire black will be attached to the input number.
15 feb 2002 document name. Inductive proximity sensor cutaway with annotation.
Gallery of Npn Sensor Wiring Diagram
