2/9/2024 0 Comments Npn sensor vs pnp sensorThe 12/24V digital outputs are driven by Infineon ITS716G high-side drivers. Any kind of 12V or 24V digital output signal can be read with the IND.I/O board. So when using PNP sensors there is no need for any external components, when using NPN sensors you need an external pull-up resistor. Learn to do programs for several of the popular controllers that will put you in high demand in the job market.Please have a look at the wiring diagrams for PNP and NPN sensors below. City traffic lights are challenging and fun. There is a ton of $$$$$$$$ to be made programming industrial controllers in factories and city traffic lights. Buy some prox switches do some programs at home. Go to Ebay buy a used controller that is no longer popular they are very cheep $30 instead of $2500. I have been retired from programming for many years I wish I could show you a picture of a program but that is of little help without seeing the machine and knowing what it does and how it works. You need fail safe switches in some places. You don't want anyone getting hurt or killed. One thing lots of programmers don't think about is, what if electricity to the building goes off. Depending where each proximity switch and what is does determines if it needs to be NO or NC. Machine open and closed, electricity on & off. Example of some programs I did, machines have people that operate them there are lots of safeties, door switch for open and closed. Each line is made up of several NO & NC commands per line might be 1 or 2 or as many of 8 or 10. Programming a controller is several lines of commands might be 30 lines or 100 lines. Maybe some day you will work somewhere that uses industrial controllers = computer that uses proximity switches on equipment and you are in charge of programming the controllers on all the equipment in the factory then it will be very clear why there are both NO & NC. But I would like to know where is my mistake. Otherwise they wouldn't manufacture NO and NC proxy switches. So, it seems NO NPN proximity switch should be able to function both as NO and NC. If the load is connected between blue and black, 24V is applied to the load. If the load is connected between brown and black, 0V is applied to the load. When the proxy switch is activated, the voltages are:īetween brown and black: 0V (because NO has just become closed)īetween blue and black :24V (because black is at the same potential as brown) If the load is connected between blue and black, 0V is applied to the load. If the load is connected between brown and black, 24V is applied to the load. Proxy switch is not activated (no metal object detected).īetween brownand black: 24V (because it is NO type) And you apply power between brown (+24V) and blue (0V) and connect the load between brown and black. Say you choose NO NPN proxy switch because it suits your purpose. You connect the load (usually relay coil) between brown and black in NPN transistor and between blue and black in PNP transistor. You apply 24V between brown (+24V) and blue (0V). Regardless of the type of the switch, the following is true (I'll assume 24V power supply): So, basically, when buying an inductive proximity switch, you have to choose whether it's gonna be PNP or NPN and whether it's gonna be NO or NC (check the attached drawing). Why is there a need to produce NO and NC proximity switch? Why not just swap the wires?
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