Excellent lecture. I've not been able to fully grasp ladder logic for a long time--especially holding circuits, but you have explained it thoroughly and in an extremely well laid out and organized manner. Your teaching style is impeccable, thank you.
I don’t understand why more people don’t take advantage of videos like these. I’m studying for a test for a promotion and this video has better information than the electrical schooling I PAID for.
This is sad and funny to me as a professional technician. I have paid for courses like this in the past, and this is vastly superior. These types of circuits are fundamental, and clear explanations really help comprehension. I am looking forward to moving through your series as I move towards the PLC series.
As a person with knowledge in the subject I can say with confidence that the way Jim approaches the subject is the best that I ever seen , this channel is treasure of resources.
An excellent lecture. Well organized and easy to follow. Many thanks for your the time to prepare this video. I am a chemical engineer but need some basic knowledge of wiring diagrams. This is the best material I have found on the internet. Greetings from Poland.
This is absolutely amazing tutorial. I have just graduated from college with an Electrical Engineering degree. I want to make my career in Automation Industry. Thanks for the help.
you are so right, the first time i tried to dive right in and understand this it was very frustrating but i put my time in and now its like, yeah this is definitely making perfect sense thank you for making such a good and thorough teaching channel and you cover so very much for someone like myself who wants to jump from being a welder to working with electricity
I'm 2 weeks into an introductory Industrial Maintenance Tech course and was having some trouble with the electrical Ladder logic but after viewing this video, I finally feel more comfortable with this. Thanks for putting this out there. It really helps. All I can say is thank god for rewind...
Very nice! Glad you're making use of this material. Please tell your instructors and fellow students know about this resource and make sure to check out the complete motor control playlist at: ruclips.net/video/LM8U9FCMDx0/видео.html
Thank you for this video. I am a Ranken Technical graduate from St Louis, Missouri. Been out of school for 5 years & most been doing apartment & hotel maintenance. Not much PLC work since my first year out of school. This definitely helped me brush up & get more confident as I prepare to take this quiz for a new job working in an industrial facility. Didn't even have to get out my notes from school, this video helped all the information in the back of my head rush to the front if my head...
brilliant lecture just in old school jim pytel style. Thank you so much for such valuable contents. You're definitely making this world a even better place.
So glad I found this. My instructor for electromechanical control systems just reads off of power points. He should recommend your video. It's fantastic. Easy to follow and great explanations. Btw, you just helped me with a very similar hw that I couldn't quite figure out. It has to do with 2 solenoids and a light coming on to show which one is active. I think my circuit will work now. I even added the e-stop. 10 million thank yous!!! Subscribed. :)
Very nice! Glad you're making use of this material. Please tell your classmates about these free resources. Here's the complete motor control playlist: ruclips.net/p/PLdnqjKaksr8qRPCFkU2Q8XQe0bfo99rs6
One philosophical question. When you are good, great or the best at something ( like you ) , how you continue motivating yourself in your life ? . You must continue doing what you do best, or you have to switch and do other task ( like running the University .... ? ). That's a totally diferent topic or question what I'm asking, and luckily, I don't have that problem, because I'm not the best at what I do. But, I like to think and talking with smart, bright, intelligent and great people, and this is something that I like pretty much. As I mention a thousand times to you.... I love what you do !!!!!!!!. And you are the BEST !!!!!!!. Thanks for everyting !!!!!. Pablo.
What up? Hey if you’re in town this weekend swing by the campus Saturday for the STEM fair 9-12. You’ll be jealous of all the cool new equipment we have now!
@bigbadtech Would love to! But I live in Phoenix now. Finished a MS in EE at ASU and I work in Tesla's battery dept (Megapacks Utility scale). All these levels of education and CGCC still boasts the most technically adept teacher I've had.
You are good! i was kindof frustrated with the general basics videos that i found about ladder logics and i was wondering why they didn't talk about the actual working ofthe keys, switches and the logic behind it! This has been Extremely Helpful and i'd recommend it to my friends for sure.
Outstanding lecture! The hard wired e-stop circuit shown here is the most straightforward way to stop a machine. Also NFPA-79 requires that e-stops be normally closed contacts, and cannot be integrated through a PLC. However, a safety relay or safety PLC (like a PILZ) may be used since they are designed for that purpose. I have seen machines that use normally open contacts for the e-stop and use the regular PLC to stop the machine without cutting power to the control transformer. These will not pass an electrical inspection. Thank you for demonstrating the correct way to control!
True dat! If there's one thing I learned from watching the Terminator is to never trust a machine. Check out the "PLC Interface" lecture at: ruclips.net/video/G4uo0Sm0uMo/видео.html where I expound upon the necessity of a fail safe means of killing a machine dead.
Jim I wanted to say how much I enjoy all your lectures. I wish I had gone to college w you as my professor. I'm very curious about something. Your lectures cover a very broad range of topics. How in the world did you learn all of it? What do you actually do for a living? Thanks!
Glad to hear you're making use of this material. I presently teach for the Electro-Mechanical Technology program at Columbia Gorge Community College. It's a program that really does include a bit of everything: electricity and electronics, hydraulics, pneumatics, mechanics, motor control, semiconductor devices and circuits, digital logic, PLCs, industrial control, programming, and power generation and transmission. As for my professional background I'm a former Captain in the US Army and I've worked in semiconductors and industrial windpower. You can't learn everything at once, however, you never have to stop learning.
Jim Pytel I knew it, ever since finding your videos a few months ago and experiencing your unique style of sarcasm in all of the videos I have watched I figured you had to have a military background. I retired from the Air Force on the enlisted side (MSgt) as a Civil Engineer in 2015 and I have plenty of experience working with the all branches but primarily the Army Engineers and Navy SeaBees during deployments to Iraq and Afghanistan. It’s funny how military folks have developed their own style of sarcasm and you Sir are no exception. BTW, thank you for your service and all of the content you’ve created. I’m definitely trying to make the most of it as I’ve changed careers or fields, I was a plumber and now I’m working as an instrumentation tech in Alaska at a coal fired power plant.
@@AKBRONCOSFAN007 Some people can't handle this level of sarcasm! Check out some of the angry comments in the "Basic PLC Instructions" lecture. It's like they have thin skin or something? Glad you're making use of this material. Lot's more coming your way.
I'll be at CGCC till at least this June. The motor control course is not fully online. In addition to these lectures the course necessitates a bi-weekly face to face lab.
Thanks for explaining this. While I am used to reading standard standard electrical schemactics, I had been throughly confused by this weird schemactic that came with a piece of used equipment I had purchased. Now I know what it was and will better understand how to interpret one in the future.
ohhh...im newbie to this channel...i like the way it is to refresh my college days.. but the way you discuss about diagram i noticed you fotgot to label to im losing fucos on where im am in the part of discussion but over all its nice...thanks..
Don't give me too much credit. I just turn the mike on, click record, and make it up as I go along. Just kidding. Thanks for the kind words. Lots of work goes into this material and I'm glad you're make use of it.
Excellent presentation. One comment is that at 12:05 its mentioned that there should not be an "output only:, I've often seen an indicating light just tied across as a "Control Power Available" indicator,
If you can understand this, troubleshooting will come easy to you.... I took a course similar to this for industrial electrical services and since then, if you give me the diagram and schematics I can troubleshoot with the best
Thank you for taking the pain to do this beautiful lecture going from the simple circuit to the complex ones. You are speaking too fast though so I had to slow the video in order to keep up. Thank you so much.
Lamp "C" is always on, alright? Just let it drain power continuously until it 🔥 burns out 😂😂😂. It's Title 24 compliant, don't worry. 😉😁 Seriously though, really LOVED the video, TY.
the first stop button is on the wrong side, it is a normal push button that opens the circuit if you push it. the lock has to be the normal closed button which should be underneath not on the top. when you push it will not open, as shown now it is at the top so if you push it it will do nothing. it has to be underneath so that when you push it, the circuit opens.
Jim, at 16:30 you spoke about a PBX switch which from your explanation i somewhat understand. I want to ask however about control circuits that uses 3 or 4 position key switches that when moved through their positions activate different parts of the circuit. How is this represented on a ladder diagram. Do you have lectures on this that you can point me to. I am currently using your videos to understand the ladder diagram of a control circuit using a four-position key switch.
It gets super difficult after 2 mechanically interlocked switches to draw it schematically so often people revert to using a "contact chart" or "target table" as illustrated in this lecture: ruclips.net/video/ENCdPsA9PXc/видео.html if the mechanical interlock spans several rungs it's often easier to use "house notation" as illustrated in this lecture: ruclips.net/video/f1Lj9I0vX6U/видео.html
Nice explanation, but in the example at 25:53 where you added the stop push button; be represented with the push button on the bottom of the ladders rung to illustrate that you are actually pushing rather than pulling? Judging by only a few moments later it appears the stop button you created penetrated the rung to stop operation. Maybe it doesn't matter, just an observation, I know breakers in simplified form can be shown as a stop partition that is on top of the rung, but those are also generally on the right side of the rung too, like the relay.
I have been working with hold circuits using relays and PLCs for decades (wow I was going to say years until I did a quick count in my head... I'm getting old) and after that amount of time you realize in the real world you have to go one step further. That step is to design for the unintended consequences. That is the operator who will hold the start button thus causing the cylinder to continuously "chatter" or only retract for the amount of time it is in contact with LS-1. If you have not already (I'll have to look through your excellent offering of videos) your next video (Titled: Beyond Basic, But Not Quite Advanced Ladder) should cover how to make that cylinder cycle once regardless of the state of the start pushbutton. That is what I call developing logic to "outsmart stupid". LOL 😅 The only reason I bring this up is because I have commissioned many systems created by genius engineers who unfortunately think in a linear way not expecting a "curve ball". Those who are just learning and have watched this excellent video I want you to think out of the box a bit whether designing and or troubleshooting. This is where designing or diagnosing these circuits or PLC logic becomes fun or at least challenging. Really enjoy your videos.
Excellent point. Yes, I plan on covering anti-tie down circuits in later lectures. When it comes to system design I tend to think in the following fashion "If you give a soldier, student, or operator a rubber hammer and an anvil ... they'll break both of them. "
Hello. This video is suggested viewing in the maintenance dept of my employer. Our guru Dave watched it and had the following observations. I understand this is a 7 year old video so i doubt you're monitoring and responding to comments, but just in case, what are your thoughts regarding the following: That is one nice intro! However I do have one disagreement with an early part of the video. In the first part he stated that having an output lamp (C) wired directly across the two vertical rungs is senseless. I have to disagree and frankly it is pretty common as such a light indicates that the ladder logic is functional or enabled. Lamp C could also be a relay which is often used to sound an alarm to centralized controls. Further we also have examples on the floor of an input to a PLC being directly wired to report the same info to the PLC. If I remember correctly the Epsilons have such a directly wired connection, to the PLC, to indicate control power functional. In any event that one issue, status indication, can be extremely useful when you have more complicated things happening, that don’t fit in with an introductory video like this. So if people keep this in mind we have one of the better introductions to ladder logic on RUclips. I would urge everyone in the shop to take a look. Thank you.
Good point. Lamp C could be a quick diagnostic check to see if the ladder logic is even receiving pilot level power. Rather than a technician testing it with a multimeter an operator could simply tell the tech if the light is on or off. The pumping circuit examples lecture at: ruclips.net/video/Q9osi4bKSLg/видео.html features a couple other simple diagnostic examples.
Thank you for replying so quick. I’ll check out that playlist now. Might have a few questions for you later on so I’m sorry if you start see too much from me. Again, thank you.
Thank you so much for sharing your knpwledge. I have a question.What will you add to hold the cylinder at a certain position.I believe the solenoid valve must be in neutral position for that to happen.But based from the schematic diagram the solenoid valve used has only two positions.I want to see how the ladder diagram will change if you incorporate a solenoid valve with neutral position.
Yes, if you wished to hold the cylinder at the limits of extension it would necessitate a double solenoid valve with either a closed or tandem center. Check out the directional control valves lecture for a description of these positions at: ruclips.net/video/QaagWlHbxr0/видео.html Long story short the ladder logic would necessitate solenoid A be energized during extension (and not B), neither energized for the hold, solenoid B for retraction (and not A), and neither for the hold at retraction. Here's a much more complicated circuit that uses a double solenoid valve: ruclips.net/video/QaagWlHbxr0/видео.html
@@bigbadtech Hi Jim. Thanks for your very useful lectures. I am new in this field. Concerning using 2 solenoids for maintaining pressure cylinder positions at limits of travel. My CNC machine has a pneumatic tool changer but the set up has a pressure cylinder with 2 limit switches and just 1 DCV ( 5 way/2positions, spring offset). It holds the cylinder in its extended and retracted positions. How is this?
Interestingly enough PLC ladder logic language (RLL) is a programming method purposely designed to be stylistically similar to old school hardwired relay based ladder logic. Idea was to program a PLC just like you'd wire up ladder logic. Since then there's a number of other styles of PLC programming developed like FBD, SFC, etc.
Excellent lecture. I've not been able to fully grasp ladder logic for a long time--especially holding circuits, but you have explained it thoroughly and in an extremely well laid out and organized manner. Your teaching style is impeccable, thank you.
Agreed
I don’t understand why more people don’t take advantage of videos like these. I’m studying for a test for a promotion and this video has better information than the electrical schooling I PAID for.
Glad you're making use of this material. Tell your friends!
This is sad and funny to me as a professional technician. I have paid for courses like this in the past, and this is vastly superior. These types of circuits are fundamental, and clear explanations really help comprehension. I am looking forward to moving through your series as I move towards the PLC series.
Google must introduce a feature where we can thank you again and again with a thumbs up every time we feel gratitude.
One always has the option of writing "Thank you!" on the side of a G5 Optix XR bow sight with floating hybrid pin and sending it to me!
As a person with knowledge in the subject I can say with confidence that the way Jim approaches the subject is the best that I ever seen , this channel is treasure of resources.
Finally someone who can break down schematic diagrams to the basics and explain with clarity. Youre amazing!
That's a lecture, great. Thanks
An excellent lecture. Well organized and easy to follow. Many thanks for your the time to prepare this video. I am a chemical engineer but need some basic knowledge of wiring diagrams. This is the best material I have found on the internet. Greetings from Poland.
Nie ma za co!
This is absolutely amazing tutorial. I have just graduated from college with an Electrical Engineering degree. I want to make my career in Automation Industry. Thanks for the help.
Great job. I'm an electrician apprentice 4 weeks in. Totally confused every day. Thanks for making it clear.
very nice! Glad you’re making use this material. Please let other individuals enrolled in the apprentice program know about these resources!
Finished school and started a job in a steel mill.. overwhelming.. revisiting the basics is helping me..
you are so right, the first time i tried to dive right in and understand this it was very frustrating but i put my time in and now its like, yeah this is definitely making perfect sense thank you for making such a good and thorough teaching channel and you cover so very much for someone like myself who wants to jump from being a welder to working with electricity
THANK YOU, FOR THIS VERY WELL ILLUSTRATED, AND EXPLAINED TUTORIAL, ON BASIC "LADDER LOGIC" DIAGRAMS, AND "START/STOP/HOLD/E-STOP" CONTROLS!
I'm 2 weeks into an introductory Industrial Maintenance Tech course and was having some trouble with the electrical Ladder logic but after viewing this video, I finally feel more comfortable with this. Thanks for putting this out there. It really helps. All I can say is thank god for rewind...
Very nice! Glad you're making use of this material. Please tell your instructors and fellow students know about this resource and make sure to check out the complete motor control playlist at: ruclips.net/video/LM8U9FCMDx0/видео.html
Thank you for this video. I am a Ranken Technical graduate from St Louis, Missouri. Been out of school for 5 years & most been doing apartment & hotel maintenance. Not much PLC work since my first year out of school. This definitely helped me brush up & get more confident as I prepare to take this quiz for a new job working in an industrial facility. Didn't even have to get out my notes from school, this video helped all the information in the back of my head rush to the front if my head...
back again! Now I'm out of the apprenticeship and taking a continuing ed class. Yet another instructor sending us here.
Im glad for it!
Welcome back! Working on some new pneumatics material right now then returning to the motors and generators playlist.
brilliant lecture just in old school jim pytel style. Thank you so much for such valuable contents. You're definitely making this world a even better place.
So glad I found this. My instructor for electromechanical control systems just reads off of power points. He should recommend your video. It's fantastic. Easy to follow and great explanations. Btw, you just helped me with a very similar hw that I couldn't quite figure out. It has to do with 2 solenoids and a light coming on to show which one is active. I think my circuit will work now. I even added the e-stop. 10 million thank yous!!! Subscribed. :)
Very nice! Glad you're making use of this material. Please tell your classmates about these free resources. Here's the complete motor control playlist: ruclips.net/p/PLdnqjKaksr8qRPCFkU2Q8XQe0bfo99rs6
One philosophical question. When you are good, great or the best at something ( like you ) , how you continue motivating yourself in your life ? . You must continue doing what you do best, or you have to switch and do other task ( like running the University .... ? ). That's a totally diferent topic or question what I'm asking, and luckily, I don't have that problem, because I'm not the best at what I do. But, I like to think and talking with smart, bright, intelligent and great people, and this is something that I like pretty much. As I mention a thousand times to you.... I love what you do !!!!!!!!. And you are the BEST !!!!!!!. Thanks for everyting !!!!!. Pablo.
Thank you so much I can't believe your 4 year old video is still helping people including me thanks alot you explain very very well keep it up !
Had this class in 2015 with Professor Pytel. Still come back to the lecture when I need to work with PLC
What up? Hey if you’re in town this weekend swing by the campus Saturday for the STEM fair 9-12. You’ll be jealous of all the cool new equipment we have now!
@bigbadtech Would love to! But I live in Phoenix now. Finished a MS in EE at ASU and I work in Tesla's battery dept (Megapacks Utility scale). All these levels of education and CGCC still boasts the most technically adept teacher I've had.
This is a wonderful lecture. I didn't understand how it works but I can draw the ladder diagram now. Wow, I will be one of big fans of you. Thanks.
You are good! i was kindof frustrated with the general basics videos that i found about ladder logics and i was wondering why they didn't talk about the actual working ofthe keys, switches and the logic behind it!
This has been Extremely Helpful and i'd recommend it to my friends for sure.
Awesome videos you have. I finally understand ladder logic and complex circuits are made way, WAY easier now. Thank you!!
Excellent job Jim. Thanks so much for sharing. I'm a self learner. Your tutorial kept me motivated and made my learning process easy going.
Thanks Jim, you explained this in a way more easier way than my teacher has!
Very nice, please tell your classmates about this resource.
Excellent video! Thanks for making this information available publicly.
This has just become my current module topic and its all new to me. You have explained this very well and it all makes sense. Thank you !
Outstanding lecture! The hard wired e-stop circuit shown here is the most straightforward way to stop a machine. Also NFPA-79 requires that e-stops be normally closed contacts, and cannot be integrated through a PLC. However, a safety relay or safety PLC (like a PILZ) may be used since they are designed for that purpose. I have seen machines that use normally open contacts for the e-stop and use the regular PLC to stop the machine without cutting power to the control transformer. These will not pass an electrical inspection. Thank you for demonstrating the correct way to control!
True dat! If there's one thing I learned from watching the Terminator is to never trust a machine. Check out the "PLC Interface" lecture at: ruclips.net/video/G4uo0Sm0uMo/видео.html where I expound upon the necessity of a fail safe means of killing a machine dead.
Wow, you are an excellent teacher sir.
Jim I wanted to say how much I enjoy all your lectures. I wish I had gone to college w you as my professor. I'm very curious about something. Your lectures cover a very broad range of topics. How in the world did you learn all of it? What do you actually do for a living? Thanks!
Glad to hear you're making use of this material. I presently teach for the Electro-Mechanical Technology program at Columbia Gorge Community College. It's a program that really does include a bit of everything: electricity and electronics, hydraulics, pneumatics, mechanics, motor control, semiconductor devices and circuits, digital logic, PLCs, industrial control, programming, and power generation and transmission. As for my professional background I'm a former Captain in the US Army and I've worked in semiconductors and industrial windpower. You can't learn everything at once, however, you never have to stop learning.
Jim Pytel I knew it, ever since finding your videos a few months ago and experiencing your unique style of sarcasm in all of the videos I have watched I figured you had to have a military background. I retired from the Air Force on the enlisted side (MSgt) as a Civil Engineer in 2015 and I have plenty of experience working with the all branches but primarily the Army Engineers and Navy SeaBees during deployments to Iraq and Afghanistan. It’s funny how military folks have developed their own style of sarcasm and you Sir are no exception. BTW, thank you for your service and all of the content you’ve created. I’m definitely trying to make the most of it as I’ve changed careers or fields, I was a plumber and now I’m working as an instrumentation tech in Alaska at a coal fired power plant.
@@AKBRONCOSFAN007 Some people can't handle this level of sarcasm! Check out some of the angry comments in the "Basic PLC Instructions" lecture. It's like they have thin skin or something? Glad you're making use of this material. Lot's more coming your way.
@@bigbadtech are you still teaching this there and is it available to take online , love that philosophy we never have to stop learning,
I'll be at CGCC till at least this June. The motor control course is not fully online. In addition to these lectures the course necessitates a bi-weekly face to face lab.
This seemed so complex initially but it made sense to me, thanks Jim!
Thanks for explaining this. While I am used to reading standard standard electrical schemactics, I had been throughly confused by this weird schemactic that came with a piece of used equipment I had purchased. Now I know what it was and will better understand how to interpret one in the future.
ohhh...im newbie to this channel...i like the way it is to refresh my college days.. but the way you discuss about diagram i noticed you fotgot to label to im losing fucos on where im am in the part of discussion but over all its nice...thanks..
That intro song 🔥🔥
This whole video 🔥🔥🔥
Thank you, Jim. You are an amazing teacher.
Jim you’re the man ! Excellent Tutorial 👌🏽
Solid video, just simply explained and goes in order perfectly
All I can say... Thanks so much, too much knowledge, be blessed
Got the basic logic after this explanation., thank you
Excellent tutorial. Sincerely appreciated!
Thank you for the great video. I am sharing with my Manufacturing Controls course.
Very nice! Glad you're making use of this material. Give me a shout at my cgcc address and I can send you some more resources for your class.
Wow awesome video! I need few more times to watch.
Great lectures . Superb . Thankyou
Don't give me too much credit. I just turn the mike on, click record, and make it up as I go along. Just kidding. Thanks for the kind words. Lots of work goes into this material and I'm glad you're make use of it.
Hope this channel grows... 😍😍🇳🇵🇳🇵
Excellent presentation. One comment is that at 12:05 its mentioned that there should not be an "output only:, I've often seen an indicating light just tied across as a "Control Power Available" indicator,
Best lecture ever!
Fantastic, thank you for sharing all of this information.
Excellent explanation thank you 🙏
Very clear and well explained.
You're such an excellent man
If you can understand this, troubleshooting will come easy to you.... I took a course similar to this for industrial electrical services and since then, if you give me the diagram and schematics I can troubleshoot with the best
Excellent lecture. Keep it up!
Thanks! Please tell your friends these free resources exist.
Thank you for this. I learned quite a bit.
Very well explained thank you very much
Hi! I am from Brazil, Rio de Janeiro ...i liked the song you start your video!!!!!
Great job perfect teaching
I had to pause and say Thank you Sir!
At first I thought this was a dumb video, man was I wrong! Super good job!
This is excellent. Thank you very much
Extremely helpful video!
Thank you for taking the pain to do this beautiful lecture going from the simple circuit to the complex ones. You are speaking too fast though so I had to slow the video in order to keep up. Thank you so much.
excellent lecture...thank you very much...
Lamp "C" is always on, alright? Just let it drain power continuously until it 🔥 burns out 😂😂😂. It's Title 24 compliant, don't worry. 😉😁 Seriously though, really LOVED the video, TY.
Nice job keeping it real👍
I just wanted to say Thank you
Nice one. Keep it up
Great Video and to the point; Thanks.
Extremely well explained!
NO OTHER WORD THAN AWESOME, THANKS
Good stuff...nice review
very nice explanation, thank you!
Great work, thank you!
the first stop button is on the wrong side, it is a normal push button that opens the circuit if you push it.
the lock has to be the normal closed button which should be underneath not on the top.
when you push it will not open, as shown now it is at the top so if you push it it will do nothing.
it has to be underneath so that when you push it, the circuit opens.
He’s so right about fans being stupid and pumps being dumb. I can tell you from experience.
Beautifully explained
awesome lecture !!!
Fantastic lecture
Jim, at 16:30 you spoke about a PBX switch which from your explanation i somewhat understand. I want to ask however about control circuits that uses 3 or 4 position key switches that when moved through their positions activate different parts of the circuit. How is this represented on a ladder diagram. Do you have lectures on this that you can point me to. I am currently using your videos to understand the ladder diagram of a control circuit using a four-position key switch.
It gets super difficult after 2 mechanically interlocked switches to draw it schematically so often people revert to using a "contact chart" or "target table" as illustrated in this lecture: ruclips.net/video/ENCdPsA9PXc/видео.html if the mechanical interlock spans several rungs it's often easier to use "house notation" as illustrated in this lecture: ruclips.net/video/f1Lj9I0vX6U/видео.html
Nice explanation, but in the example at 25:53 where you added the stop push button; be represented with the push button on the bottom of the ladders rung to illustrate that you are actually pushing rather than pulling? Judging by only a few moments later it appears the stop button you created penetrated the rung to stop operation. Maybe it doesn't matter, just an observation, I know breakers in simplified form can be shown as a stop partition that is on top of the rung, but those are also generally on the right side of the rung too, like the relay.
Yes, customarily NC push buttons are drawn below the rung.
Thanks for the clarity! Still learning :)
Brilliant. Many thanks.
you are great teacher. may the lor
d continue to enrich your knowledge
Thanks a lot for sharing this vid. It is amazing!!!
Great video thank you!
Great explanation
Jim amazing explanation :)
Good day sir in learning the ladder logic it needed to download a software & where? if not how to get this? thank you & more power.
I have been working with hold circuits using relays and PLCs for decades (wow I was going to say years until I did a quick count in my head... I'm getting old) and after that amount of time you realize in the real world you have to go one step further. That step is to design for the unintended consequences. That is the operator who will hold the start button thus causing the cylinder to continuously "chatter" or only retract for the amount of time it is in contact with LS-1. If you have not already (I'll have to look through your excellent offering of videos) your next video (Titled: Beyond Basic, But Not Quite Advanced Ladder) should cover how to make that cylinder cycle once regardless of the state of the start pushbutton. That is what I call developing logic to "outsmart stupid". LOL 😅 The only reason I bring this up is because I have commissioned many systems created by genius engineers who unfortunately think in a linear way not expecting a "curve ball". Those who are just learning and have watched this excellent video I want you to think out of the box a bit whether designing and or troubleshooting. This is where designing or diagnosing these circuits or PLC logic becomes fun or at least challenging. Really enjoy your videos.
Excellent point. Yes, I plan on covering anti-tie down circuits in later lectures. When it comes to system design I tend to think in the following fashion "If you give a soldier, student, or operator a rubber hammer and an anvil ... they'll break both of them. "
@@bigbadtech How true... LOL
Hello. This video is suggested viewing in the maintenance dept of my employer. Our guru Dave watched it and had the following observations. I understand this is a 7 year old video so i doubt you're monitoring and responding to comments, but just in case, what are your thoughts regarding the following:
That is one nice intro! However I do have one disagreement with an early part of the video.
In the first part he stated that having an output lamp (C) wired directly across the two vertical rungs is senseless. I have to disagree and frankly it is pretty common as such a light indicates that the ladder logic is functional or enabled. Lamp C could also be a relay which is often used to sound an alarm to centralized controls. Further we also have examples on the floor of an input to a PLC being directly wired to report the same info to the PLC. If I remember correctly the Epsilons have such a directly wired connection, to the PLC, to indicate control power functional.
In any event that one issue, status indication, can be extremely useful when you have more complicated things happening, that don’t fit in with an introductory video like this. So if people keep this in mind we have one of the better introductions to ladder logic on RUclips. I would urge everyone in the shop to take a look.
Thank you.
Good point. Lamp C could be a quick diagnostic check to see if the ladder logic is even receiving pilot level power. Rather than a technician testing it with a multimeter an operator could simply tell the tech if the light is on or off. The pumping circuit examples lecture at: ruclips.net/video/Q9osi4bKSLg/видео.html features a couple other simple diagnostic examples.
Hey, Jim.
Which of your videos would you recommend me watching for basic or introduction to electrical?
The first lecture of this playlist should give you an idea of the map I've laid out for you: ruclips.net/p/PLdnqjKaksr8qQ9w3XY5zFXQ2H-zXQFMlI
Thank you for replying so quick. I’ll check out that playlist now. Might have a few questions for you later on so I’m sorry if you start see too much from me.
Again, thank you.
Jim this is super as others are
Your the man thank you!
Can you make some videos on timers ,counters and other type of options offered on allen Bradley or plc .
Stay in touch. I’d like to cover these topics and more in later lectures.
Thank you so much for sharing your knpwledge.
I have a question.What will you add to hold the cylinder at a certain position.I believe the solenoid valve must be in neutral position for that to happen.But based from the schematic diagram the solenoid valve used has only two positions.I want to see how the ladder diagram will change if you incorporate a solenoid valve with neutral position.
Yes, if you wished to hold the cylinder at the limits of extension it would necessitate a double solenoid valve with either a closed or tandem center. Check out the directional control valves lecture for a description of these positions at: ruclips.net/video/QaagWlHbxr0/видео.html Long story short the ladder logic would necessitate solenoid A be energized during extension (and not B), neither energized for the hold, solenoid B for retraction (and not A), and neither for the hold at retraction. Here's a much more complicated circuit that uses a double solenoid valve: ruclips.net/video/QaagWlHbxr0/видео.html
@@bigbadtech Hi Jim. Thanks for your very useful lectures.
I am new in this field.
Concerning using 2 solenoids for maintaining pressure cylinder positions at limits of travel.
My CNC machine has a pneumatic tool changer but the set up has a pressure cylinder with 2 limit switches and just 1 DCV ( 5 way/2positions, spring offset).
It holds the cylinder in its extended and retracted positions.
How is this?
Great video, this would be considered ladder schematic diagram not ladder logic correct? Ladder logic is a PLC language
Interestingly enough PLC ladder logic language (RLL) is a programming method purposely designed to be stylistically similar to old school hardwired relay based ladder logic. Idea was to program a PLC just like you'd wire up ladder logic. Since then there's a number of other styles of PLC programming developed like FBD, SFC, etc.
You are the best
AWESOME Tutorial
Your voice makes me wanna fall asleep and I’ve an exam in half an hour... at least I’ll be chilled out for it :/
nice one
Very good
good points mentioned in the video.Enjoyed a lot.
Dude . You rock star