PLC Interface Methods (Full Lecture)

  Рет қаралды 33,422

Jim Pytel

Jim Pytel

7 жыл бұрын

In this lesson we'll examine the placement of emergency stops, overloads, and auxiliary contacts in PLC controlled systems and how these devices can be physically hard wired into a system such that safety is not compromised. Additionally, we'll examine how interposing relays can interface elements intended to operate at different levels of pilot voltage with one another. Finally, we'll examine how PLC based systems are represented using schematics. (Full Lecture)
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Use it. Don't steal it. Be cool.
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For more FREE online technical training check out the following playlists available at the bigbadtech channel:
DC Circuit Analysis • DC Circuit Analysis
Single Phase AC Circuit Analysis • Single Phase AC Circui...
3 Phase AC Circuit Analysis • 3 Phase AC Circuit Ana...
Hydraulics • Hydraulics and Electri...
Pneumatics • Pneumatics
Motor Control • Motor Control
Motors and Generators • Motors and Generators
Motor Drives/Variable Frequency Drives (VFD) • Motor Drives
Programmable Logic Controllers (PLCs) • Programmable Logic Con...

Пікірлер: 30
@marc-andrelauzier1587
@marc-andrelauzier1587 4 жыл бұрын
You make amazing educational videos, you really have a great ability to explain things clearly and get your message across. Love it
@bigbadtech
@bigbadtech 4 жыл бұрын
Glad you're making use of this material. Please let your friends know these resources exist!
@alikhanzulkashov4438
@alikhanzulkashov4438 7 ай бұрын
Thank you so much, very clear explanation!
@kleopasshitaleni9032
@kleopasshitaleni9032 6 жыл бұрын
great work. I learn more from youtube than I to from lectures
@fabianm.2982
@fabianm.2982 4 жыл бұрын
Great work Sir, i have learned morethan i can capture in a class.
@michaelcostello6991
@michaelcostello6991 6 жыл бұрын
Another fabulous video with key technical content presented so well. One suggestion from a purely visual context. Could you include a photo of an example installation where these relays are used saying what they are driving. It may drive home all the great key information you have given in the video bringing it to life in the real world. I think it helps to remember a lesson perhaps.
@bigbadtech
@bigbadtech 6 жыл бұрын
Funny you should mention that because I'd like to eventually do a "Commissioning a PLC" lecture that features one making use of interface relays. Great minds think alike!
@burakayan3360
@burakayan3360 2 жыл бұрын
amazing course
@sahistapatel458
@sahistapatel458 3 жыл бұрын
Very helpful
@charlesbouschor8237
@charlesbouschor8237 7 жыл бұрын
Jim, great videos. Do you have a series dedicated to AB / Rockwell PLC's?
@bigbadtech
@bigbadtech 7 жыл бұрын
Not yet. I'm busy developing the AC circuit analysis series but want to return to PLCs and discuss both AB and Siemens PLCs.
@aaw7410
@aaw7410 2 жыл бұрын
@@bigbadtech Interest intensifies (AB)
@reynoris9064
@reynoris9064 6 жыл бұрын
would you make a video as to how access, troubleshoot and diagnostic/repair a problem on the field, lets say a real troubleshooting situation in an industrial enviroment..a conveyor system would be great..Thank you
@bigbadtech
@bigbadtech 6 жыл бұрын
I don't have any PLC based troubleshooting lectures yet, however, I do have a couple simple hard wired relay based ladder logic motor control troubleshooting demonstrations in the "Electrically Controlled Systems" playlist at: kzfaq.info/get/bejne/grNoiJx3qLOoqGQ.html
@artevellian4546
@artevellian4546 6 ай бұрын
I have a question: would not a 120VAC-rated mechanical push button switch work perfectly well with 24VDC in our low power pilot voltage settings?
@bigbadtech
@bigbadtech 6 ай бұрын
Yes often times the electromechanical switched inputs largely don't care what style of pilot input they use within a certain range. Output devices however are very picky about DC vs AC!
@artevellian4546
@artevellian4546 6 ай бұрын
@@bigbadtech Thank you for the answer )
@kozstandsya1494
@kozstandsya1494 2 жыл бұрын
With the interposing relays, wouldn't you need one on either side of the switches? What I understand, your schematic shows as follows: 24vdc going into the switch, line from the switch going into the IR to change it to 120Vac, then into the PLC. I thought the PLC is designed to take 24Vdc, so how are you having the output a 120Vac going straight in there? And if the switches are rated at 120Vac, it doesn't make sense to have the IR after the switch. What makes sense in my mind is as follows: an IR changing 24Vdc to 120Vac, line from IR to the push button switch, line from switch to another IR, changing it back to 24Vdc, line from last IR to PLC. The PLC receives 24Vdc as expected, and the switch receives 120Vac.
@bigbadtech
@bigbadtech 2 жыл бұрын
There's 2 things to consider with interposing relays. What flavor (24Vdc or 120VAC) does the PLC like? What flavor does the switch and output device like? If the switch likes 120V and the PLC likes 24V a 120 to 24 IR is placed between the switch and the PLC. Similarly if the output device likes 120 and the PLC outputs 24V a 24 to 120 IR is placed between the PLC and the output device.
@kozstandsya1494
@kozstandsya1494 2 жыл бұрын
@@bigbadtech If the switch likes 120v and the PLC likes 24v, and an IR is placed between the switch and the PLC, doesn't the switch input still receive the 24V coming from the battery?
@bigbadtech
@bigbadtech 2 жыл бұрын
No. A 120V rated switch merely energizes or deenergizes a 120V rated coil. The coil in turns closes or opens 24V rated contacts.
@kozstandsya1494
@kozstandsya1494 2 жыл бұрын
@@bigbadtech Ahh I must just have a misunderstanding of how the interposing relay works, thank you
@samsimpson711
@samsimpson711 7 жыл бұрын
Jim, your videos are great but you need to shorten or remove the intro music/scene, its very annoying especially when you're binging videos (which I assume is something you'd like).
@briancarson8789
@briancarson8789 7 жыл бұрын
Sams comment may sound like a harsh criticism, but I definitely appreciate when a youtube channel has very little or NO intro on their videos. I personally think the best way to address this is to have an "Introduction to the Channel" video that we can watch one time, and have the rest of the channel just get straight to content. Thanks for the videos Jim.
@bigbadtech
@bigbadtech 7 жыл бұрын
Not offended in the least. It's feedback like this that makes the channel better. Very early in the production process a viewer from Poland asked me to pause more for the benefit of English as a second language viewers. When I reviewed the videos in question I noticed I had edited out ALL the natural pauses (I was very new at editing!). In regards to the title sequence I hear what both of you are saying and I could probably afford to trim it down a bit, but, the NSF requires me to put a disclaimer up front and ... hate to say it ... but it's also about marketing! This is the catch that every time you drive down town and see a giant gorilla climbing up a wind turbine you can't help but think "bigbadtech"! To save you guys some time when you're binging I think 99% of the title sequences end up being about 15 seconds long if you want to skip it. Either way I'm glad you guys are using this material!
@briancarson8789
@briancarson8789 7 жыл бұрын
Awesome, what a guy!
@someguy9431
@someguy9431 5 жыл бұрын
It doesn't bug me. It's kind of catchy and most of the videos are 20-30 minutes. So you might here it 2-3 times in an hour. Also with the amount of work into the videos, I can understand the desire/need to "brand" the video at the beginning.
@nishyu9101
@nishyu9101 4 жыл бұрын
That's a good point, i do think that the intro is important but maybe you could reduce the volume of the intro, as its a roar in comparison to the rest of the Lecture (which is perfect :-)).
@larryschweitzer4904
@larryschweitzer4904 5 жыл бұрын
"Can you trust a computer" Since this lecture was produced we now have self-driving cars. Perfectly safe, not likely, but given how safe many drivers are, the computer is probably going to be safer.
@nishyu9101
@nishyu9101 4 жыл бұрын
i thought you must've wrote something relevant to this lecture, but i donno what you're on about.!
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