The following is a wiring diagram of an open collector npn sensor. 3 wire and 4 wire dc.
Industrial Sensing Fundamentals Back To The Basics Npn Vs
Npn proximity switch wiring diagram. Industrial sensors of all types have connection diagrams. 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. 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 difference is a result of the internal circuit design and type of transistors used. The ck1 00 2h is an 18mm diameter npnpnp nonc. We will be wiring a capacitive proximity switch into the input of our click plc.
Two specific types of 3 wire sensors are available. Selectable output with a 12mm sensing distance. This means that multiple sensors can be connected to an input card with all sensor negative wires to one common wire. You will notice that the load appears between the v brown and switching wire black. Npn sensor outputs switch in a negative fashion. The schematic diagram symbol for a proximity switch with mechanical contacts is the same as for a mechanical limit switch except the switch symbol is enclosed by a diamond shape indicating a powered active device.
When connecting to the plc the plc input acts as the load. This wire is noted on the io modules wiring diagram. Wiring diagrams show the hook up offour sensors with npn and pnp outputs. Ultrasonic proximity switches sense the presence of dense matter by the reflection of sound waves. Pnp switched positive npn switched negative switched refers to which side of the controlled load relay small indicator plc input is being switched electrically. The v brown will be attached to the common input and the switching wire black will be attached to the input number.
Heres a simple way remember how to wire up a 3 wire dc pnp or npn sensor. The switching logic pnp or npn are not related to the supply voltage of the sensor or the operating voltage of the input. Schematic for hall proximity switch from ebay its like a baby is drawing it in practice for laymen this diagram inappropriate. If a switching output is strictly pnp or npn the external connection through the loadthanks for purchasing our inductive proximity limit switch kit. Pnp sensor outputs switch in a positive fashion. Either the load is connected to negative and the positive is switched pnp continue reading an easy way to remember pnp and npn sensor.
My schematic is better. Keep in mind that the hall probe sensor only switches when the magnet is 1 10mm awayto test the wiring run the magnet in front of the probe mthe speedometer on the led display will show. A pnp sensor may be either no or nc as can an npn be. That means that the sensor can be wired as positive sourcing or negative sinking switch.
Gallery of Npn Proximity Switch Wiring Diagram
