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!!!
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.
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)
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.
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.
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.
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.
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' ?
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.
This is a great review for me. I am an electronics tech but took a PLC class in college back 15 years ago. Just recently bought a A&B SLC 500 setup cheap and will be re familiarizing myself with programming just for little projects. Thanks for these great refresher videos, you explain things very clearly.
Synthpro I notice you recently bought a A&B SLC 500. Me too, and I would like to discuss more on the situation with you. Inbox me at montoit49@gmail.com. thanks.
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
plcprofessor, Again, great job. I am starting your series on PLC training. I do have an undertstanding of PLC devices and the A-B platforms. My main purpose to watching your training is to evaluate these training sessions to be used by those that we are training to work with our Automation and SCADA systems. You do have a great process of training. Your details are most valuable. Thank you again for all that you have done and do. You are a great help to all who will spend the time to watch. AOK
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.
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
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.
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.
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.
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.
I'm starting to learn more about automation that uses PLCs on Beckhoff servo motors and your introduction about this subject was simply amazing! The explanation of the relay's functionality was so clear to understand that the rest of the video and its subtle transition to FALSE/TRUE logic went quite smoothly to follow. Even without the deep breathes pauses. Many thanks for this video and I'm quite glad to see that you continue to produce videos nowdays, which is why I just subscribbed to your channel.
It took me quite some time and a very patient co-worker explaining and then re-explaining motor starters, auxiliary contacts, 3-wire holding circuits, etc. But once you 'get' the basics-everything else is just an add on to that basic start/stop circuit. I learned to not be intimidated at a control panel full of wires but instead to patiently trace wires and figure out what's going on. It feels great when everything 'clicks'. Great video!
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 :)
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.
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.
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!
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
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.
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 !
This is by far my favorite video to have people watch that are trying to understand industrial control electronics. I know its about PLCs but the information in here is so relevant since its the building blocks of understanding diagrams. Great content right here, I watched this myself a number of times as I went through the journey of learning about controls.
Thank you for this series. I intend to get into the maintenance department at the factory I work at, knowing PLCs is gonna give me a definite leg up on the interview.
Great tutorial. As a journeyman electrician on refineries- i came across to what the operators do, but rarely put any thought deeper than running wires from Instruments to J-boxes and so further to DSL. Thanks a lot and Keep it up!
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
It's a great video. I've been a j.w for 25yrs and refreshing my memory with the basics was fun. Thank you for a great tutorial. Your efforts are superhuman, considering some of the subhuman responses.
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.
+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.
+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.
Thanks for helping me to learn PLC from basics as I have no idea about PLC other than its basic functions.Your teaching methodology helps me to remain concentrated throughout the video.Keep spreading your knowledge.God bless you.
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...
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.
Hate to jump the gun here but in college we used RS Logix 5000 and using ladder logic, structured text, and sequential function chart(function block diagram didnt have all instructions proving to be insufficient). Okay so we used the first 3 languages only, to create fuzzy logic and finite state machine programs. Was pretty neat and we watched ur vids all the time in class. Electronics engineering technician here and soon to go for my B.A. to work in town at a local factory. I'll find my powerpoint and share it with everybody here soon.
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 !.
Great lecture Sir !!! Your tutorial is very clear and comprehensive i appreciate the tremendous efforts you produce to make explanations easier!!! Thanks a lot!
You're awesome. Your explanation helped me during my on the job training at subaru plant. You're a lot more clearer than my trainers. Thank you. Please make more videos
Thank you professor! I've been looking for a real good online course for learning PLC, and honestly this is the best a found and I've been looking a lot! Really really good.
PLC professor inspired me to make more video when i first came to america last 2015 ive watch all his video and i found a good salary job as maintenance now i will help my co maintenance by making more video also thanks a lot PLC Professor
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.
One thing I've always wondered about relay coils. Like @19:00 - since a relay coil is really nothing but a single wire wrapped up why doesn't it short out when the voltage is applied? Is it the core giving it resistance, or what exactly?
+Mee “meesphht” Siphht A short (shorted circuit) is an accidental situation where the two leads from the power source are directly connected, bypassing (shortening) the intended circuit. The resistance of the entire length of insulated conductor that forms the coil is high enough (DC resistance or IR resistance) to limit the current while producing the magnetic field. For AC coils, the inductive reactance provides the opposition to high current flows.
Thank you for spending your time helping others with your videos! I have an associates degree in electrical/electronic automated systems from the local junior college and within a year out of school I'm making 75k as an industrial electrician at a refinery. PEOPLE! Their are good paying careers out there that don't cost an arm and an leg! Education doesn't stop at high school or college, the more you know the more valuable you are to potential employers!
Relay contacts have a "normal" state based upon the normal state of the coil whose normal state is OFF. Whatever state the contact is in when the coil is off is the contacts "Normal" state. With form "C" contacts, one is always open and one is always closed and they switch states when you energize or de-energize the coil.
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!
Hey great vid, I really don't understand at 50:39 why 1PB & 1CR-1 are False while they are both 'open' at that moment and while they are normal open contacts... thanks
A NO relay contact in an electrical circuit is a logical query of the state of that relay's coil. When you use the NO contact, logically, to query the coil to see if it is energized, the contact being open says that the coil is not energized or logically false, whereas the NC contact being open says that the coil is energized. A NO contact is true if the coil is energized (active state) and false if the coil is de-energized (at rest state). A NC contact is true if the coil is de-energized and false if the coil is energized.
plcprofessor Always keep in mind that coils and bits in memory are ON or OFF, never true or false. Relay contacts and the PLC instructions that look like relay contacts are true or false, never ON or OFF. Relay contacts are used to read the state of the coil.
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!!!
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.
Finally understand how a stop/start station operates !!!! This is quality education right here...
This video is above and beyond what I've watched before. Controls is my Achilles heel.
Thanks
Very thorough. Made me digress to my Vo-Tech Training back in 1976 - 1981. Electrical Theory! WOW!!! Very Nicely done.
Wow this video is absolutely unbelievable, by FAR the best educational video I’ve EVER seen on UA-cam
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?
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.
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.
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.
This is absolutely the best PLC video I have ever come across . Your noble efforts are highly appreciated Sir .
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?
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.
This is a great review for me. I am an electronics tech but took a PLC class in college back 15 years ago. Just recently bought a A&B SLC 500 setup cheap and will be re familiarizing myself with programming just for little projects.
Thanks for these great refresher videos, you explain things very clearly.
Synthpro I notice you recently bought a A&B SLC 500. Me too, and I would like to discuss more on the situation with you. Inbox me at montoit49@gmail.com. thanks.
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
plcprofessor, Again, great job. I am starting your series on PLC training. I do have an undertstanding of PLC devices and the A-B platforms. My main purpose to watching your training is to evaluate these training sessions to be used by those that we are training to work with our Automation and SCADA systems. You do have a great process of training. Your details are most valuable. Thank you again for all that you have done and do. You are a great help to all who will spend the time to watch. AOK
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
Very simple and easy to understandable Teaching . Thus why I want to call you ...Teacher .. keep going sir
It's my pleasure
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.
Omg, I'm impressed of how well you explain about PLC, because at college I barely could understand of programming. Thanks for the videos...
thanks brother u are really helping out a lot of people underpriviledged here in Africa
Your videos have been such a huge help in learning PLC'S that I have been sharing them at work with MHE & CST techs.
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.
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.
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
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
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.
I'm starting to learn more about automation that uses PLCs on Beckhoff servo motors and your introduction about this subject was simply amazing!
The explanation of the relay's functionality was so clear to understand that the rest of the video and its subtle transition to FALSE/TRUE logic went quite smoothly to follow. Even without the deep breathes pauses. Many thanks for this video and I'm quite glad to see that you continue to produce videos nowdays, which is why I just subscribbed to your channel.
It took me quite some time and a very patient co-worker explaining and then re-explaining motor starters, auxiliary contacts, 3-wire holding circuits, etc. But once you 'get' the basics-everything else is just an add on to that basic start/stop circuit. I learned to not be intimidated at a control panel full of wires but instead to patiently trace wires and figure out what's going on. It feels great when everything 'clicks'. Great video!
This is a very clear,detailed and excellent lecture plc good starter
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 :)
thanks, plc professor, this is great tutorial ,I have to watching many times, I want to learn more from you
You are most welcome
Makes a lot more since now even after just watching 22 minutes of it. I plan on watching more soon.
Thank you
Beautifully made simple. Thank you sir. your simplicity is appreciated
You are most 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.
I've been watching hours of PLC videos. This is by far one of, if not the best, I've come across.
You are single handedly getting me through my PLC course, thank you so much!
Gracias por este instructivo video. La dicción del orador es muy buena y se entiende perfectamente.
el gusto es mio...
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.
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?
Watching this to prepare for U.S. Steels electrical learner program entry test. Great informative video on PLC.
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
Thanks Professor, your tutorials are very clear and on point. i will learn a lot for sure.
+Rican Pacan Thank you for the compliment, it is a blessing to hear. The pleasure is mine.
I felt so dumb because others explained it like I was learning to hot wire a spaceship. Thank you for keeping it simple.
#ItsSimplyLogical
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.
a big "thank you" for putting these videos up on youtube, they are very helpful.
You have done a great job explaining the basics .
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!!
This is one of the vidoe that helped get to know about PLC year back, thank you so much for this vidoe
You're very welcome!
This series is great. Thank you!
Glad you enjoy it!
This is by far my favorite video to have people watch that are trying to understand industrial control electronics. I know its about PLCs but the information in here is so relevant since its the building blocks of understanding diagrams. Great content right here, I watched this myself a number of times as I went through the journey of learning about controls.
This is probably the best educational video I've ever seen. Thank you!
Mojca Rojko thanks
Thank you for this series. I intend to get into the maintenance department at the factory I work at, knowing PLCs is gonna give me a definite leg up on the interview.
Great tutorial. As a journeyman electrician on refineries- i came across to what the operators do, but rarely put any thought deeper than running wires from Instruments to J-boxes and so further to DSL. Thanks a lot and Keep it up!
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.
You explain this stuff fantastically, your doing for electrics/PLC's etc what the Khan academy is doing for mathematics. Great stuff
It's a great video. I've been a j.w for 25yrs and refreshing my memory with the basics was fun. Thank you for a great tutorial. Your efforts are superhuman, considering some of the subhuman responses.
Finally found a great video about PLC
The same here !!
My pleasure...
This is good stuff!
It's tough finding a good intro presentation on this topic but you've done it. Hats off to you my good man!
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!
Thanks for helping me to learn PLC from basics as I have no idea about PLC other than its basic functions.Your teaching methodology helps me to remain concentrated throughout the video.Keep spreading your knowledge.God bless you.
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...
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
its very nice lecture and thankful of you for sharing such a valuable knowledge with all
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.
Hate to jump the gun here but in college we used RS Logix 5000 and using ladder logic, structured text, and sequential function chart(function block diagram didnt have all instructions proving to be insufficient). Okay so we used the first 3 languages only, to create fuzzy logic and finite state machine programs. Was pretty neat and we watched ur vids all the time in class. Electronics engineering technician here and soon to go for my B.A. to work in town at a local factory. I'll find my powerpoint and share it with everybody here soon.
Superb content and presentation, thank you
Our pleasure!
Awesome video! trying to get a good grasp on PLCs. Your video has definitely helped me understand some aspects. thanks
You are currently helping me greatly with you basic explanation omg thank you bro
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 !.
thanks sir your lectures has improved my knowledge and am considering undertaking a course in automation
Absolutely helping video for the bigners I do aprictiate your good efforts to learn PLC programing thank you professor
Great lecture Sir !!! Your tutorial is very clear and comprehensive i appreciate the tremendous efforts you produce to make explanations easier!!! Thanks a lot!
You are most welcome
Very Good presentation by professor, Expect many more of your presentations. Fantastic
I like your definition and your contents. Thank you!
Awesome video! Great background and very detailed and thorough introduction. Thanks!
You're awesome. Your explanation helped me during my on the job training at subaru plant. You're a lot more clearer than my trainers. Thank you. Please make more videos
I just want appreciate the good work prof.
Thank you professor! I've been looking for a real good online course for learning PLC, and honestly this is the best a found and I've been looking a lot! Really really good.
I'm learning a lot with your videos... thanks.
The pleasure is mine...el gusto es mio...
PLC professor inspired me to make more video when i first came to america last 2015 ive watch all his video and i found a good salary job as maintenance now i will help my co maintenance by making more video also thanks a lot PLC Professor
In my opinion your video is probably the best...!! Tnx,,!!
Thanks you so much please don't stop what u r doing 4 minutes video will help a 4 million people
Thank you for a wonderful and clear explanation
You are welcome!
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.
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.
One thing I've always wondered about relay coils. Like @19:00 - since a relay coil is really nothing but a single wire wrapped up why doesn't it short out when the voltage is applied? Is it the core giving it resistance, or what exactly?
+Mee “meesphht” Siphht A short (shorted circuit) is an accidental situation where the two leads from the power source are directly connected, bypassing (shortening) the intended circuit. The resistance of the entire length of insulated conductor that forms the coil is high enough (DC resistance or IR resistance) to limit the current while producing the magnetic field. For AC coils, the inductive reactance provides the opposition to high current flows.
+plcprofessor Lol, I guess that's why they call it a short circuit. A longer circuit doesn't do that.
This lecture is beautifully conducted and thoroughly explained. Thank you.
You're very welcome!
Thank you plceprofessor, keep up the good work!
you are welcome...
An excellent presentation .
Thank you .
Thank you for spending your time helping others with your videos! I have an associates degree in electrical/electronic automated systems from the local junior college and within a year out of school I'm making 75k as an industrial electrician at a refinery.
PEOPLE! Their are good paying careers out there that don't cost an arm and an leg! Education doesn't stop at high school or college, the more you know the more valuable you are to potential employers!
Relay contacts have a "normal" state based upon the normal state of the coil whose normal state is OFF. Whatever state the contact is in when the coil is off is the contacts "Normal" state. With form "C" contacts, one is always open and one is always closed and they switch states when you energize or de-energize the coil.
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!
Prof. you are extraordinary smart and good man. I wish you all the best.
+Gligo Podrobilica The pleasure is mine...
Professor, this lecture helps me a lot in understanding PLC.
Good Job!
Excellent presentation skills
Great video that open my path to learning PLC.
Glad it was helpful!
Hey great vid,
I really don't understand at 50:39 why 1PB & 1CR-1 are False while they are both 'open' at that moment and while they are normal open contacts... thanks
owh! Does 'True' means there's contact, and false means there isn't, just simply that?
A NO relay contact in an electrical circuit is a logical query of the state of that relay's coil. When you use the NO contact, logically, to query the coil to see if it is energized, the contact being open says that the coil is not energized or logically false, whereas the NC contact being open says that the coil is energized. A NO contact is true if the coil is energized (active state) and false if the coil is de-energized (at rest state). A NC contact is true if the coil is de-energized and false if the coil is energized.
plcprofessor Always keep in mind that coils and bits in memory are ON or OFF, never true or false. Relay contacts and the PLC instructions that look like relay contacts are true or false, never ON or OFF. Relay contacts are used to read the state of the coil.
Very helpful and informative video! Thank you!