PNP vs NPN Sensors. Could Your Machine Have this Problem?
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- Опубликовано: 6 янв 2023
- This is a common question when selecting sensors for a UL 508A control panel. The major deciding factor will be what sensor is compatible with your PLC and both are capable of doing the same job in most industrial automation applications. There are a few differences in how a wiring fault can affect your control system that are important to understand.
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We use almost all PNP on the machines at my job. I'll be honest though I never really thought about the implications of a short when in comes to those two types of inputs.
Good video, very informative thank you Tim 👍🏻
Glad it was helpful Shawn.
Informative thank you
You're welcome!
Very good info. We use both types. Depends what the machine manufacturer decides to install in their equipment.
Yes, most of the time it does.
Thanks for the information. Have a great day
You too!
Hi Tim, That's informative. Thanks very much for sharing.
However, I still had some sort of confusion on this subject because I'm a newbie in Automation.
I saw your previous video on "Sinking and Sourcing PLC Inputs", on the comment section of that video one guy named "Nikhil Shinde" says this
"For one of my application (egg counting system) previously I used PNP, and the result was that I was getting short on the counts by 10k. I then used NPN, with 24V going to the PLC com and receiving a negative input on the PLC card, and the count was approximately perfect."
I didn't understand what he meant by that.
Could you please explain it? or make a separate video on this subject?
Once again, Thanks very much, keep going.
NPN circuits are capable of switching faster than PNP circuits. That is why you will see NPN circuits on high speed application such as encoders even when there is a preference for PNP sensors.
@@TimWilborne This lit the bulb. 🧠 💡
Thanks again Tim! 😊
It is a great question, maybe I'll do a video clarifying it
@@TimWilborne Wow. I'm keen to learn more from the video.
What brand of hmi screen is that you are using? Very informative video. At my current job, we use both pnp and npn. Never really thought about the shorting issue with npn. Thank you.
It is a Panelview 5000
Is there a video on saving parameters from a drive and downloading parameters to a new drive?
Here is how to do it by the control module, I should do one on CCW and Studio 5000 sometime, those are two other popular methods.
ruclips.net/video/61bnrASCJ9w/видео.html
@@TimWilborne
Yes, studio 5000 and logic 5000 is what im trying to learn as engineering preferes we specifically use saved backup files, Thanks for the reply!
Shorting out sensor not explained. A simple sketch for newbies would clarify
Hi Michael, check out 1:50 of the video. I am taking the PLC input I have wired to the sensor and shorting it to the 0V of the power supply.