Ladder Logic Documentation (Full Lecture)
ฝัง
- เผยแพร่เมื่อ 17 ก.ย. 2015
- ERROR AT 23:55: NOHC FS in rung 4 should have terminal numbers 3 4, NO PS in rung 6 should have terminal numbers 3 4, NCHO FS in rung 8 should have terminal numbers 1 2
In this lesson we'll learn how to properly document a ladder logic diagram. We’ll learn to comment functional blocks, number rungs, number wires, number terminals, identify devices and associated contacts, and perform numerical cross referencing for logical elements and mechanically interlocked devices. Additionally, we’ll discuss proper grounding and circuit protection practices. (Full Lecture)
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Use it. Don't steal it. Be cool.
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For more FREE online technical training check out the following playlists available at the bigbadtech channel:
DC Circuit Analysis • DC Circuit Analysis
Single Phase AC Circuit Analysis • Single Phase AC Circui...
3 Phase AC Circuit Analysis • 3 Phase AC Circuit Ana...
Hydraulics • Hydraulics and Electri...
Pneumatics • Pneumatics
Motor Control • Motor Control
Motors and Generators • Motors and Generators
Motor Drives/Variable Frequency Drives (VFD) • Motor Drives
Programmable Logic Controllers (PLCs) • Programmable Logic Con...
Thank you Sir,
I have seen most all of your videos.
Because of them I was able to move from millwright to maintenance electrician in an automated factory setting.
This is a dream come true for me. Without your help this would not have been possible.
The entire world is richer when everyone has access to knowledge.
Thank you for creating this public resource.
+John Shearing You are the EXACT dude I needed to write a letter of recommendation for me for a proposed project for the NSF ATE. Super glad to hear this material is being put to use outside of schools. Stay in touch because I've got a lot more cool stuff coming your way!
+Jim Pytel
Please let me know how I can help.
I have scoured the internet. Except for your work, there is almost nothing on reading ladder logic diagrams for industrial controls (non-PLC). Some of the many other knowledge areas required to service industrial automation can be found on the internet with great effort, but they are scattered and come without a logical order of presentation. The country relies on people like me to keep our factories running but with swing shifts and twelve hour days, school is not an option for us. Your model of education is invaluable to the growth and wellbeing of our nation.
johnshearing@gmail.com
+John Shearing Not to worry. We just submitted the grant application last week and a number of industries and other schools already sent in letters of commitment. If all goes well you'll see this channel FULL of material over a 2 year period.
I totally agree with your perspective about hard wired relay based ladder logic, I really consider it an essential topic that goes hand in hand with PLCs. A number of industries in our region (wind turbines, lumber mills, etc.) employ a mix of hard wired relay based ladder logic and PLC controlled systems. It helps immeasurably to be skilled in both.
That is largely the function of the grant I'm applying for. I'm trying to put these resources online for folks already employed such that they can stay employed and still enroll in a program of study. My students don't have a sit down class or text book anymore. All time together is now spent building and troubleshooting. More exposure to equipment and instrumentation, less commute, and much more fun.
+John Shearing Too funny. I've actually spoke with Pete Vree before. Very small world. Yes, I eventually plan on including some "hands on" wiring exercises using an inexpensive motor control trainer board we use at our school that I'm currently updating. It's one thing to see the symbols but another thing entirely to know the 43 to 44 terminals are the NO auxiliary contact that must go in parallel with the 3 4 terminals of the NO manual input.
Need more of this similar presentation
Never in my 30 years as an instrument tech have I seen such a clear and logical explanation of the ladder logic documentation. Bravo sir!
When I have a problem, I always end up with watching Bigbadtech videos! Best channel!
Wow... simple explanation, easy to understand. Now I knew already how to read electrical logic diagram
Dear Jim
Long time I tried to understand the logic of ladder diagram, at last I can. You explain great, thanks a lot.
Jim,
Great Lecture! Very clear, nice and slow with lots and lots of explanation. These standards are found in books, tech literatures and taught in electrical tech courses and some even in electrical engineering and CAD Design Technology. But none does such a great job as you, where you explain so well the whys and hows of them - especially documentation!
I would love to see some GRAFSETs implementations (How to design STEP CONTROL circuits ) as you have the ability to explain so well. The other items you may add in your future list are - PID loops in Industrial controls - Single/dual loops etc..there are some by others, but I believe you will do a superb job!!
Keep up the good work. You got me as a fan!!!
You are a blessing to students like me. Thank you.
Thx for sharing knowledge.
Awesome work.
Jim you are the best
The ckt looks neat 👌
Thanks Jimmy!!!
Great video sir. Thank you.
I suggested this playlist to classmates In the AIT class. I hope they take a look at least, if not I at least pointed out this awesome Lecture to them. Maybe they will comment if they watched it. You make this understandable and clear thanks for your upload and time putting this on here. I have learned more from this then the Instructor I had in the previous class in the AIT program. Thank you for your time for Putting this series together.
Very nice! Yes, please let your cohort know this resource is available. By AIT I'm presuming you mean "Advanced Individual Training", correct? If so what MOS are you training for and what base? I know some folks in the Air Force have been using this material.
@@bigbadtech Advanced Integrated Technologies for an Aluminium company building a new Plant in Ky. The school in collaboration with Braidy Industries is developing The AIT program. In turn, will be Hiring graduating students as Employees out of School. it is supposed to be one of the 13th largest buildings in the USA.
Excellent. Thanks for the information. Good luck in class and stay in touch. I'll be updating some of the resources on this channel in the near future.
thanks so much for the video its so amazing the age we live in you can learn anything on youtube
Thanks sir for sharing good lesson
What are the relevant industry standards for the wire numbering/labeling scheme you suggest using?
Thank you Jim
Thanks lot
thank you sir,I love most of yr videos. one of the best i ever see
do you have eg program for positioning servo motor control and porportional valve
Not yet. Stay in touch because eventually I'd like to cover more advanced topics.
Hi Jim, I love all your videos. Thank you so much. What software do use use to make your diagrams?
Glad you're making use of them. Most of the lectures I just free hand draw on MS One Note and record using Camtasia.
Jim, your videos are excellent and I am learning a lot for my current job. One question: How do you differentiate the left most wire is common for CR1A and PR1&PR2 @16:53? Is this something you assume by looking at the icecube terminals?
Your videos are much appreciate and I will recommend them to anyone wanting to learn to read and write ladder logic for PLC. Thanks.
This is based on the presumption that the circuit is making use of 8 pin SPDT C form transfer contacts. Customarily the common (ie: 11 or 21 terminal) is on the left and the NC or NO terminal is on the right. Check out the control relay lecture at: th-cam.com/video/STKH6Rp7rX8/w-d-xo.html Glad you're making use of this content!
Good question, I had the same one. thanks Lucas.
sir ....i want to know more about sensors ......and these sensors how are they integrated with electronic circuits..... pid control how it can be achieved in pneumatic ,electronic ,hydraulic.......more about ultrasonic sensors infrared sensors...and wat are the criteria to put that sensor on that place......plz explain...as u explained in vane pump lecture by opening the internal circuitry...
sir presently i am waiting for ur lectures regarding alternator,dc generator ,dc motor,ac motor ,synchronous motor....power management system.....one more thing you explained basic ladder logic circuit very welll.....since i am from shipping industry so i had seen some electronics controlled modem with ladder logic.....it is having rectifier and alll...so i need some help if u can add some electronic logic control in pump circuit...sir i have a curiousity regarding alternator protections and high voltage protection........i am continuously learning from your lectures but expecting more and more from you whch wl be very helpful for others who want to upgrade knowledge day by day..
sir can you put some lights on hydraulic governor woodward ug8 working and how can be it is achieved from electronic governor.....
Jim, great video. I'm confused as to how the P coil will energize if the NC PR1 opens when coil PR is energized. I don't see the an electrical flowpath that will allow the motor to run. Can you help me understand? Thank you.
That's the point of the NC PR1 contact. It's an electrical interlock that opens and prevents the P coil from being energized if the the pressure exceeds the setpoint of PS 1 in rung 6. If everything is below the setpoint it'll function as intended, however, if pressure rises above some predetermined maximum it'll prevent operation of the pump.
Ahhh. I now see that the PR coil is only energized when PS1 is made. I apologize for the dumb question. Thanks, and again, this a great video series.
Hello, Jim
One question about contacts numbering of the float switch FS1 23:57.
As it NO in rang 4 and been held closed it should be 3-4 instead 1-2? Am i wrong?
Thank you for greate tutorials.
Good catch! I number the terminals correctly at 18:59 but for some reason I mess it up when I re-number them at 23:54. You're correct that manufacturers traditionally label terminals for NC devices as 1-2 and NO devices as 3-4 despite being held in an actuated state.
Hi Jim! Can you please advise us with the right sequence ? Most of the students visiting are pretty new with the subject. It would assist us if we can get the best content in order.
Best Regards!
For basic electronics use these playlists in sequence:
th-cam.com/video/Do7VzDuB_Rc/w-d-xo.html
th-cam.com/video/flRocvQxQw4/w-d-xo.html
th-cam.com/play/PLdnqjKaksr8qzoIGCYx2rhVK51ZPjXkRO.html
For motors, motor control, motor drives, and PLCs use these playlists in sequence:
th-cam.com/video/SB8BTldMsO0/w-d-xo.html
th-cam.com/video/LM8U9FCMDx0/w-d-xo.html
th-cam.com/play/PLdnqjKaksr8qxlMYRVTF2YzTm6RwtA7pc.html
th-cam.com/video/uT3m-o1PM3c/w-d-xo.html
For hydraulics:
th-cam.com/play/PLdnqjKaksr8ruhw85YYSSO6EWLhVVmSKm.html
Jim this is great man think you should have this lectures on pdf so we can download.
Glad you're making use of the material. Unfortunately I don't have the Motor Control lectures on pdf yet. I do, however, have the most of the basic electronics series and hydraulics available at the following links. Still working on Basic Electronics 1 and all the rest.
Basic Electronics 2 Study Guides
openoregon.pressbooks.pub/electronics2/
Basic Electronics 3 Study Guides
openoregon.pressbooks.pub/electronics3/
Hydraulics and Electrical Control of Hydraulic Systems Study Guides
openoregon.pressbooks.pub/hydraulics/
Greetings sir,your lectures r quite helpful. i had already went through many videos but yours is the btr among them. can you upload a lecture for timers and counters in PLC ladder logic?
I've got a whole playlist about traditional hard wired relay based ladder logic making use of timers at: th-cam.com/play/PLdnqjKaksr8qR35HIbsx8GMoOPolgWw74.html however I don't have any content about PLC based timers yet. When I finish the "AC Circuit Analysis" playlist I plan on returning to this subject.
My boss wants me to connect two floating devices via the same relay connection, should I connect a second relay in parallel jumping A1 and A2 from one relay to the other and keep the systems separated?
+rarrmonkey I'd hesitate to commit to any answer since I don't know the specific system you're working on, however, yes, two loads (coils, indicators, etc.) can go in parallel in ladder logic. When one is energized so is the other. Check out the "Basic Ladder Logic" lecture at: th-cam.com/video/qDuCusvU-mY/w-d-xo.html
Thanks sir, this is the best ladder documentation video. I am a newbie. I have a ladder that has something written above the start of rungs/blocks. Is it some kind of notes or comments? Any references for more videos, e articles or books?
Most likely notes or comments. Check out the entire motor control playlist at: th-cam.com/video/LM8U9FCMDx0/w-d-xo.html
Is there a prequel to this video that will help me understand switches (like SPST, SPDT, etc.)? Or is that too basic and I need to learn it someplace else? Thanks!
This is part of the larger "Motor Control" playlist at: th-cam.com/video/LM8U9FCMDx0/w-d-xo.html specifically this lecture: th-cam.com/video/LM8U9FCMDx0/w-d-xo.html
Also this lecture describes some switch terminology: th-cam.com/video/p96txBM6GWI/w-d-xo.html
This is great. Everything is clear. Mmm......I love when a plan comes together🚬
That's just the first part of the plan. Here's the complete plan: th-cam.com/play/PLdnqjKaksr8qRPCFkU2Q8XQe0bfo99rs6.html
@@bigbadtech I have been through a number of your lectures already and I must tell you that I am now finally understanding this language. I am not an electrician but a Mechanical engineer. Great work Jim. I am so happy I stumbled across these lectures. Thank you man.
On a 8 pin ice cube relay aren't the coil terminals 2 and 7? I thought a1 and a2 coils were on contractors.
Good question. Both are correct. Components can use different terminal marking schemes NEMA and IEC (sometimes both!). I prefer the IEC because there's a clear pattern that indicates functionality.
NEMA:
1st switch common 1
1st switch NC 4
1st switch NO 3
2nd switch common 8
2nd switch NC 5
2nd switch NO 6
coil 2 and 7
IEC:
1st switch common 11
1st switch NC 12
1st switch NO 14
2nd switch common 21
2nd switch NC 22
2nd switch NO 24
coil A1 and A2
36:15 - 36:40 Not clear to me. You have two NC proximity switch however as you stated...if they were a three terminal single pole double throw switch then the terminal note would be 11 - 12. As the diagram shows PX1 is closed but PX2 is open so obviously it is been held open electronically. How?. Please explain.
Yes, in the deenergized start state PX2 is a NC switch being held open by being in proximity to a ferrous object. In this circuit it could be a cylinder in the retracted state with PX2 on the cap end being triggered. The terminals are still numbered based off the unactivated electromechanical state (ie: NC 11 12).
Classic example of this is a NC refrigerator light switch being held open by the shut door keeping the light off. When someone cracks the door the NC switch closes and turns the light on.
@@bigbadtech Like I thought. Understood clearly. Thank you so much. Everything is better when u know.
@@bigbadtech I have a minor confusion for the same time period. When you relabel the PX1 and PX2 (making the assumption that they are single pole double throw configuration) should they become 11,12 and 21,22 since the switches are independent? The two 11,12 makes sense to me if they are independently housed switches but if they are housed in one unit it seems like the numbering should change?
Why did you run a wire from stop push button to aux contact
Check out the 2 and 3 wire magnetic motor starters lecture at: th-cam.com/video/kr7XiQ84rdo/w-d-xo.html Long story short a NO auxiliary contact in parallel with a NO start push button creates a holding (memory, seal in) circuit with a maintained run state allowing an operator to press and release the start push button.
It seems to me @37:00 there are two DCV2 SOLA
Good catch! I draw the ladder logic diagram correctly (with DCV2 SOLA on rung 2, DCV1 SOLB on rung 3, and DCV1 SOLA on rung 5) in a later lecture on electrically sequenced cylinders at: th-cam.com/video/4V_9dl3VIjI/w-d-xo.html
😍😍
Can you suggest text books for beginners like me
No textbook check out this playlist: th-cam.com/play/PLdnqjKaksr8qRPCFkU2Q8XQe0bfo99rs6.html
Your voice is a dead ringer for Alton Brown.
I actually like method 2 since for me its easier to read in order the wire numbers. Its confusing for me to see 1,3,4,2 as the numbers for example in row 1. In fact it makes no sense for me the 1st method.
I feel comfortable using method 1, because that indicates wiring number 1, 2 are for the main power source. We use method 1 in Taiwan too. : )
It's so frustrating to understand this, as I'm seeing everyone else grasping it. Whereas the numbers aren't as tussling in comparison to some weeks ago, it's the wiring while facing the panel itself.
True dat. It's one thing to look at it on paper and another thing entirely to look into a den of snakes coiled up in some enclosure all the same color and with faded wire numbers. Check out some of these simple examples before you tackle a big one:
th-cam.com/video/nwpCBYBlex8/w-d-xo.html
th-cam.com/video/k91zAKx9V_0/w-d-xo.html
th-cam.com/video/rDSIK8sbqMY/w-d-xo.html
Your drawings are all wrong and you need to redo them.. Jk I learned a lot you really know your stuff and I'm using your lessons in the field, keep up the great work thank you.
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