Npn To Pnp Converter Circuit Diagram
Sep 23, 2012 i want to convert npn sensor output signal into pnp signal. Pls help me to make a circuit for this converter. Npn To Pnp Converter Circuit Diagram Npn to pnp converter and pnp to npn converter, npn to pnp converter and pnp to npn converter features: *.
Why don't you simply pick sensor with NPN output? Cara Download Film Gratis Subtitle Indonesia Download more. Just call your local reps and tell them what you need. (polarity, sensing distance, diffuse with background suppression etc.) Take alook at the You will notice that 42BA S2LNAE-A2 is NPN so you don't have to change anything. You can use PNP output to drive small relay (700HK slim line from Allen Bradley for example or their twin G2R-SND from Omron). Use relay contact to turn on PLC input.
Even better - use compact relay in form of terminal block or polarity converter block (they are not as popular and hence cost more than relay). You can also add just simple resistor to PNP sensor (load for open collector - 2.2k 1/2watt is fine) and invert the bit in PLC. You might be tempted to simply switch 'light on/dark on' option on your sensor instead of editing program. Be sure this is safe for the process/machine. NPN is very common for sensors and PLC comming from Japan and all their equipment I've worked on so far was always using NPN types.
In Europe and America PNP is much more popular but it's not like you can't find the NPNs as well. I use them all the time for all Honda and Toyota projects. You are more likely to have better selection and more readily available sensors if you stick with Japanese parts (Omron for example). Allen Bradley is leading brand in America but if you face the long delivery time, try to convert the signal via relay or Nigel's circuit. This is not preffered method since requirements in industrial enviroment are a bit different and it wouldn't last long when handled by most electricians I know but it would work.
If you go this route just make sure to pick 1/2watt resistors and try to put it on DIN rail mountable bases (Phoenix Contact or Weidmuller). Also add LED to show operation and one or two diodes to protect it from reversed polarity. I would also add current limiting resistor in the collector circuit so the shorts on the output wouldn't kill it. Have fun You might want to check industrial automation forums. They normally handle this type of questions.
I think farooque is probably talking about an open collector output, that would be pretty standard. F) Generally speaking you would hook the sensor to a high impedance input that is pulled up with a resistor but you need to appreciate that your function is inverted IE active low. The simplest, external inverting circuit I can think of would be to use a line driver chip, ULN200##.
They are good for reasonable voltages and support a fairly hefty current, relatively speaking. They provide the same open collector output as your sensor so if you pull up your input and also pull up the sensor output on the chip you get an active high. Using a transistor and a few current resistors to limit current and apply bias could give you an open collector output that is positive. If you want an output that can both sink and source, open collector in both states then you need a half bridge driven from your original sensor.