If you can't find the answer, you may ask a question. Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific! CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems. Foxx commented on an answer to: "high dc voltage". TwilightWolf asked: "Charging". Back Data Acquisition. Back Data Transfer Unit. Back Air Compressors. Back Industrial Camera Lenses.
Back Laser Marker. Shopping Categories. The wire connection diagram is shown as follow: A 24V sensor power supply on PLC can be used as the power supply, external power supply can also be used.
Tags: proximity sensor , plc. PLC Selection Guide. Leave your comment. Blog search. Popular Tags. Status Not open for further replies. I could use a PNP type sensor instead, however I have lot of stock with me, I don't want to buy a new part. And since there is extensive re-wiring involved for converting the input port to PNP, I think it would be easier to just connect some pull-ups instead. Funnily enough, I've recently been involved in making equipment to connect to PLC's and I've never even seen one!
We sent him a sample, and he got back in touch, and all is working fine now As you've surmised, if you need a SOURCE PNP input, you just need a pull-up resistor to 24V - but you need to bear in mind that the polarity is then reversed, which you can easily change in the PLC programming. This diagram from my tutorials shows how, the sixth diagram on the page: In that diagram, the NPN transistor would be the one inside your sensor, just the PNP and the two resistors are required, and 24V from the PLC rather than the 12V in the diagram of course.
Here are the input specs from the PLC manual :. Does the PLC provide its own input current limiting, or are external resistors required for current limiting? Click to expand I'm not familiar with PLCs and their specs. Do the above specs mean you could safely connect the input directly to 24V and directly to 0V? What is the 'common channel'? The simplest solution if it's a relatively low speed input is to use an external 24V relay. Switch the coil with the sensor, then use a relay contact to provide the PLC input.
Alternatively, you can use a resistor to hold the input "on" and use the sensor to in effect short the input to force it off. That's fine for high speed signals as well, but you need a fairly low value resistor with a decent power rating, to give an adequate input voltage with some margin above the actual switching threshold, and stand the power dissipation when it's got the full 24V supply across it. You probably need 1K or Ohms - or less, for reliable operation. Edit, re. The industry standard is that everything uses switched positive, so PNP output sensors.
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