What is a PLC? PLC Basics Pt1
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- Опубліковано 2 жов 2024
- This is an updated version of Lecture 01 Introduction to Relays and Industrial Control, a PLC Training Tutorial. It is part one of a two part lecture. PLC Programming. Correction...Joseph Henry invented the relay...
Sir, I am 20 years old. I did robotics in high school with some really simple programming and it got me in the room with a engineering firm that then proceeded to send me out into the field to replace another programmer who was being difficult to work with. I had no prior knowledge of PLC’s but after watching your videos I have acquired the requisite knowledge to preform well in my job and secure me the CTO of a company and open whole new paths in my life. I could not think you enough for how well you made this video. You didn’t assume any prior knowledge and it was easy for me to pick up. If you’re ever in dallas Texas I’d like to get you lunch!!!
thanks brother u are really helping out a lot of people underpriviledged here in Africa
These videos are going to really really help me attempt a transition in my career from serving tables at a dead end job to potentially making real money in a real world industry. thank you very much Prof.
I am just 22 years old girl, who just started learning PLC Basic. When i first found this video, I was so happy that finally someone who can show me the real basic of PLC. I can't thank you enough. Thank you so much for this video, and also hoping you to share more education video about Programmable Logic controller more.
Decided to switch my career and delve into Industrial Automation. This is the only video in youtube that is indepth and simple. Ty.
Me too. At 38 I feel old to be learning this now but better late than never. I hope I get to specialize in PLC repair and programming.
Hey Josh, I know you posted your comment a few years back, but was just wondering if you ever ended up working with plcs
I'm thinking about getting into them myself, currently an electrician (commercial)
How's it going?
This excellent. Threw me a few curve balls. It's been a while since I have worked on these. That was way before PLC came into play. I'll be watching much more. Nothing like education even at my age.
hello plcprofessor i just started to watch your kind hearted videos today about introduction of PLCs and this time im on part 2. this is wonderful gift for me who has no plc training or education. i hope you will upload more training videos.thank you very much
Very simple and easy to understandable Teaching . Thus why I want to call you ...Teacher .. keep going sir
It's my pleasure
Love!! You are favourite teacher for all your students I believe!!
Wow, thank you!
Excellent video!
You consider the perspective of the beginner, and identify what needs to be explained most very well.
ibew local 760 union electrician ; videos are easy enough to follow and are filling in some gaps in my knowledge of plc's ; thank you
This is a very clear,detailed and excellent lecture plc good starter
Thank you for a wonderful and clear explanation
You are welcome!
it is amazing Video indeed, no words can describe how good and important it is. God bless your knowledge..
The pleasure is mine. I am currently completing a new training manual based on the MicroLogix1400 with all new videos. Again, thanks for the encouragement. All of my knowledge and wisdom comes from the Father.
As an electrician I knew most of this but looking forward to the PLC part, thanks for the video & explaining it in an easy to understand lesson.
As an old timer, I decided to learn about PLC' s to be more relevant in the job market. With very little electrical knowledge, I wasted a lot of time and money trying to get going. Fortunately, I found 'plcprofessor'. I am actually understanding and learning.
Thanks a lot Pro.
You are currently helping me greatly with you basic explanation omg thank you bro
Awesome video! trying to get a good grasp on PLCs. Your video has definitely helped me understand some aspects. thanks
At 48:36, you said when the coil is de-energized, 1CR-2 is normally open. Did you mean normally closed? This is one of the best videos I've ever seen for starting at the very beginning of PLC understanding. Diagrams are VERY helpful.
You're right. He misspoke.
Thank you and when I was learning electronics our teachers used plumbing to explain this,
When im done pulling my hair out trying to trouble shoot something, i like to watch stuff like this to confirm that Im still sane afterwards
I understand that very well. Pretty much do the same thing, to confirm i'm not loosing my mind!
Thankyounormal opend closed valves Realy 220 v
Thank you so much. Your lecture is very informative.
I need clarification with the limit switches within the 35:40 mark. I heard the video mention that these limit are normally open by the manufacturer (in that they are open by spring tension). With that said, my question is once one of the homing device depresses against the roller that sticking out from the limit switch, would the state of the limit switch be considered normally open held closed (because the what is depressing against the roller have a greater force compared to the spring tension)? If so, would you check for XIC instruction for each limit switch? If the XIC is true collectively for all three limit switch then we know that the coil for 1CR is energized? Am i missing something? Thank you.
+Khoury John Limit switches usually have form C contacts, a common and a NO and a NC contact. The spring, just like in a push button holds the NC closed when not pressed and so on...
I can't say anything........how this lecture is so wonderful.
Thank you Thank You Thank you a billion times Professor.....!!!
great video , very clear and precise
PLC professor, You are the best!!
Gracias por este instructivo video. La dicción del orador es muy buena y se entiende perfectamente.
el gusto es mio...
Best ever I watched, thank you sir
You are welcome
Do you see PLC Ladder Logic using remote control signals to open and close relays in future thus eliminating excessive and long wiring harnesses? I'm a retired USAF Special Purpose Vehicle technician and have always had interest seeing this technology expanded in electrical purposes. My first introduction into PLC Ladder Logic was at Hickam Air Base when they installed a Allen Bradley 100 Pallet transfer system but have not worked on this system since then.
Thank you Professor for doing these videos. Awesome.
New to PLC . Thank you Professor
Thank you so much for this useful information
RSLogix500, the free version from Rockwell Automation. As seen in my video on building a simulator. Step by step.
In the 30:52 mark, it was mentioned that the shorting bar design gives two separate circuit. I just need to confirm, are the normally closed contacts on both sides have internal continuity with each other? Also are the normally open contacts on both sides have internal continuity with each other? Please let me know if I need to clarify what I am asking. Thank you for your time. I am very thankful for these videos. Also needed to know if you have explanation on high pressure switches and pnuematic switches, the same approach as you did when addressing the form 'C' relay contact. Where can I find a video that dissect each piece of a high pressure switch and ask the question of query the diaphragm? Have a wonderful evening.
+Khoury John John...I am not sure what your question is regarding the contacts. I do not have any info on pressure switches.
+plcprofessor Just need to confirm if I connect a load on a DC power supply on one end of the normally open contact and loop it around to the other set of normally open contact of the shorting bar relay design, would I get a complete closed circuit? I just need clarification on if the normally open contacts are internally connected to each other. Same with the normally closed contacts.
* load and a dc power supply. Just pointing out a typo in my comment.
+Khoury John You treat the two upper sets of contacts as one single normally closed contact even though the current will pass through two contacts in series. Consequently the two lower sets of contacts are consider one set of normally open contacts. Two contacts in series reduces the carbon buildup by splitting the voltage drop between the two...AND...reduces the possibility of the contacts welding together.
+plcprofessor Thank you!
This video was very well produced. He's much better than most of the lecturers I had at uni. Everything is explained properly and details are thrown here and there that illuminate concepts. I have an engineering degree and found that I learnt much, much more just from this video than my typical lectures. Thanks mate. Appreciated.
+Frank x That is nice to hear... the Lord has blessed me with a desire to understand and explain.
+Frank x Yeah, this is really well explained. I wish I had it this well explained to me when I was in tech school.
Very thorough. Made me digress to my Vo-Tech Training back in 1976 - 1981. Electrical Theory! WOW!!! Very Nicely done.
Mark:
Keep watching part one and part two, over an over again. It will come to you eventually.
Bh
Thanks this is very useful..
🙏🙏😔
plcprofessor thanks for the advice
Wow this is fucking amazing...how you broke it down and made it understandable for a neanderthal...thank you
There are mor than 60 videos in the channel and a manual that you can order off of the website if you want to do the labs discussed in the Basics, Advanced I and Advanced II video series. There is also a video on how to put together a software simulator as well if you cannot lay your hands on a hardware training unti.
You need to watch the entire Lecture (00 - 12) series on our UA-cam channel, more than once if necessary. Everything that takes place in a PLC takes place in the memory or datatable. Bits of memory being turned on or off, not relays. If the PLC has relay outputs, they mimmick the assigned bits in memory that are controlled by the program.
I've downloaded them to sit and watch them while the wife's hogging to TV.. lol.. but honestly they are great.. and watching them again you see other things too... nice job !.
Nice and informative presentation..
Wow talk about back to basics, love it
OMG....shame on me,i'v been graduated for a while and i never understood all this stuff concept~your lecture is really clear and better than all my college's teacher...i am really grateful to watch your excellent tutorial video,thanks a lot.
very good knowledge has given to us hands offf
I conclude that some viewers of this first part , introductory video in a series, may not retain the information delivered. The professor fully explains,in english,at the beginning of this presentation, that this first session is "BASIC" circuitry. As far as logic programs go, once the viewer hears that, his cerebral circuitry should designate a physical response, wherin his hand will move the cursor,via mouse or other control, to "click on" part two, following the same input, satisfied/ not satisfied should then be triggering the same type response, part 3 ,4etc.. This cerebral circuit should be re-examined for fault from other interface devices such as human emotion, which triggers deafness brought on by a superior " I know that" attitude. Professor; You may want to close caption this for those individuals, hoping that blindness is not an end response as well.
Well done tutorial plcprofessor !
Nice!!
Thank you plceprofessor, keep up the good work!
you are welcome...
Thanks God for sharing your knowledge going about to PLC, it is well explain, it is very interesting and a good help for those who cannot go to school like me to learn more on PLC. Thanks
You are very welcome
Thank you for this video, it is very helpful.
Did I share this already? I'm really impressed about this. I've always been a computer guy. Straight to programming. All the "before" stuff I understood already in a general way (0's and 1's are basically telegraph key presses) but the way he goes through this slowly and carefully and thoroughly is really amazing. He filled in ALL sorts of little gaps in my knowledge from an entirely different perspective than I'm used to.
If you do ANY programming, watch this stuff. Go through it. You'll walk away very impressed the stuff your computer/phone/tablet is doing... because THIS is the stuff it comes from. This.
Expect a headache; the language is not what you're used to if you never did electrical engineering/controls stuff. It feels like stepping inside of my computer and walking around the circuits.
What impresses me is that I never realized the technical difficulties that they must've gone through for the miniturization of this stuff to end up in the form that we use today.
Consider how these circuits were reduced to the level of electrons and electron holes.. and now we're trying to go further... it's sinking in.
Thanks for spending your valuable time to teach us. I Really love learning from your lessons. Your're a great instructor.Thank your very much.
RB khmerkingdomfilms hy
this is very important tutor for me thanks
im 158 years old, thank you good sir.
Hi profesor , i wonder what happened to your lectures / i haven`t see them lately. !!!
This is excellent. I have an interview coming up for a pharma company that require an electro mech tech and i haven't a clue what to be studying for the interview. It mentioned PLC's in the job spec so hopefully i'll be asked about this sort of stuff. Did it in college but that was 20 odd years ago. This is a great refresher!!! Thanks :)
nice lecture specially for beginners.thanks.
Loving it! At the age of 50 Ive decided to take the bull by the horns and learn about PLC's
I'm enjoying your teaching sequence of step by step, without assuming any prior knowledge.
Thanks heaps.
Same here... 46 pushing 50. Building the pc trainer and a light finally clicked on and understanding everything. Not hard once you start understanding everything.
52 here and I am learning electronics. I am doing this as just a hobby.
Ben - Myself as well. feels like Iv'e gone right back to trade school. lol
However the beginning illustration here seems backwards? The control is in the line voltage section, and the only reason I see the need for a relay, is just for a 'Red light' ?
Great to know that never is not late. Good luck with the study
Ben Frawley Hows it goin?
Sir, Please organise the PLC lectures from introduction level following the step-wise increment in one's level as it's a bit confusing which lecture to be chosen first and it would be helpful for us it is organised in a playlist. Thank You.
go to the plc euniversity site, virtual classrooms to watch them in sequence...
very nice setion..
I am so happy for these post
Yay for +25% speed for those of us with ADHD.
Nice lecture. Precise language makes it less confusing.
Glad to see a video on the internet using electron flow current.
Way better at this speed thanks!!!
Try 200% noob
I do that too. Lol
Go to the playlists. Watch the lecture series in order and then basics, adv1 and adv2 as you do the labs in the manual. The other playlists support the rest.
Hi, professor, are there any hardware or software you recommend I can purchase to help with practicals. This part 1 has really revealed a lot to me.
This is absolutely the best PLC video I have ever come across . Your noble efforts are highly appreciated Sir .
Wasted almost half of my life playing computer games. Its about time I turn my life around. Thank you for sharing your knowledge sir!
happy to hear that
Remember your goals. Make promises relevant to them, but be honest in every instance. Admit your mistakes or you will stay a slave to them.
Then keep your word in everything you do. A man is worth no more than his word.
Good for you! Go for it!
You dont wasted, maybe you are in a bad financial position, but computer games have a lot of things good. You only need to know what was good, and learn from it, then apply it on PLC. Especialy the puzzle games haha
Your videos have been such a huge help in learning PLC'S that I have been sharing them at work with MHE & CST techs.
When referring to a 'normal' position, what exactly is the criterion for defining it as such? i.e. what makes a position 'normal'? Should I consider the 'normal' position as the usual position when it is not energized/activated?
Thanks
The term "normally" has been the conventional term for contacts at the resting state for 50 years plus. If the device is at rest, not energized, not having the button depressed by someone, it is in its normal state. Hence a normally open contact is "open" if the device that operates it is at rest, not active. The symbols used in circuitry are always drawn in the normal state.
plcprofessor Ahh, I see, thanks a lot for making time to respond so fast and in such a complete manner.
Great lecture by the way, I found it really extensive and quite well paced.
I'll start working with PLC's next semester so I figured I might as well get ahead whilst I still have the time :-)
Thanks again and have a good one!
Wow this video is absolutely unbelievable, by FAR the best educational video I’ve EVER seen on UA-cam
Omg, I'm impressed of how well you explain about PLC, because at college I barely could understand of programming. Thanks for the videos...
If you are controlling a motor with the start-stop circuit that you showed at the end of this video, you would also need an overload relay installed in series with the contactor's coil in order to shut down the motor in the event of an overload.
If we were going to control a three phase motor and it was a starter instead of a contactor, yes this is true. We try to keep this level of lecture as simple as is possible. As always we appreciate all feedback in an effort to improve future lectures...again...thank you.
This is Good for student like me
excellent...
So wonderful
can anyone help me with a plc problem im stuck with if somone could reply with a solution that would be much appreciated:
problem:
The process cycle is started by pressing the start switch the start switch, which puts on a system running indicator light and the conveyor belt motor.
Boxes pass along conveyor belt and will be measures by sensors 1 and 2.
When a box is detected at the sort solenoid the belt will be stopped.
If it is a short box it will be pushed off the side of the belt.
If it is a long box the auxiliary motor Am1 (simulated by a light) is activated for 3 seconds.
The belt will be restarted and a long box will be allowed to pass off the belt.
The system should put the belt main light off when the third long box has passed off the belt.
If the stop button is pressed, everything should stop and the system reset.
Excellent presentation skills
Finally found a great video about PLC
The same here !!
My pleasure...
Superb content and presentation, thank you
Our pleasure!
did you have another part for this lesson sir? i would to watch it again for the next lesson..
plcprofessor website... Lectures tab and pick your subject... or go to playlists and you will find them in order
Good job on this lecture--very helpful.
I felt so dumb because others explained it like I was learning to hot wire a spaceship. Thank you for keeping it simple.
#ItsSimplyLogical
thanks sir your lectures has improved my knowledge and am considering undertaking a course in automation
This video is above and beyond what I've watched before. Controls is my Achilles heel.
Thanks
Thanks for sharing!
The first electrical/electronics class I ever had, my "professor" sat down and explained to us how he hadn't done anything related to electricity or engineering in over 30 years and that he had gone straight back to business school to become a lawyer after he had worked a year in an engineering field, so he was going to be learning again by teaching us. I can't even compare how much more total and useful this one hour video is compared to years of sh*t instructors while I was still at school.
great lecturing
Thank you sir.very very useful.
my pleasure
you have no idea how difficult it is for a person who cannot even speak fluent english to start learning plc by watching your video...... because I have to replay several times and google for minutes to actually grasp just one sentence in your video..... YET I've decided to keep it up to the last...... nothing is easy.....
old saying of mine..."if it was easy, everybody would do it".
Thanks…You are very good Teacher.
I'm a junior in high school taking a college class and in a program which is focused heavily upon SCADA and this video really helped with my current information of plc' s thanks!
hey man what class was that?
Wonderful explanation. Tnx
Great lesson Professor. This is a good start for me trying to setup a small system using a lift table.
I am not an electric savvy type by any means. I do mechanical design and this project I have will need the help of a PLC of some sort. Professor what would you recommend to control something not complicated like a garage door opener?
The lift table will include: two air cylinders, two momentary buttons for the cylinders, one up and one down momentary buttons, two safety door switches, one light curtain, and one proximity switch for the eight positions of the lift table. I can't seem to figure out what system to purchase. I don't want to purchase a PLC that will be more then needed to control this project.
Thanks for your help. Tony
HELLO, WHAT ABOUT THE SECOND PART OF THE LECTURE?
Dear Sir, This is something that interest me and I am interested also because of career prospects. Can you suggest how I can get some recognized training in PLC online ? Thank You,
I would google it.
50:15 you say is true/off on 1CR-2. Wouldn't that be "on" since it's closed? Awesome video, I'm learning a lot but that confused me. Thanks for the upload. I plan do go back and watch the electricity videos soon. I start classes next semester for Industrial Systems Control and I'm trying to get a head start.
All of the symbols are drawn in their "normal" state which is with their associated coil OFF, so a normally closed contact has true continuity when its coil is de-energized.
thanks, plc professor, this is great tutorial ,I have to watching many times, I want to learn more from you
You are most welcome
Thank you Sir, you made a remarkable video.
its very nice lecture and thankful of you for sharing such a valuable knowledge with all
Do you plan to do replacement videos for all the videos in the original lecture series? Also the former introduction to programmable logic control states that it's the first video in a 58 video series, but the lecture series seems to contain only 12 videos.
Prof. you are extraordinary smart and good man. I wish you all the best.
+Gligo Podrobilica The pleasure is mine...
sir this is perfect video , may god bless u , this is very helpful sir , thank u
The pleasure is mine...thank you.
Great lesson . Thank You
excellent presentation. For someone who needs this level of instruction, there is also a need at the elementary level for instructions on how to get to the next lesson
There are playlists, each of which have the respective series in order.
my name somchai thanks for that plc basic knowledge