What is Ladder Logic?
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- Опубліковано 2 жов 2024
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If you are involved in any way with industrial machinery, you almost have to have heard of ladder logic.
Since there are almost never ladders involved, it probably doesn’t make a lot of sense that we call it that, but the reasons for the name are buried in the history of automatic controls.
At one time, automatic systems were controlled with relays. Relays are electromechanical devices and fail quickly as the mechanical parts wear out and the electrical parts are destroyed as the electricity they switch burns away the contacts.
They are big and use lots of electricity, generating lots of heat in the process.
In order to understand why we call it ladder logic, you need to look at how we document relay logic controls.
The actual “ladder” was the drawing of the control logic, an illustration of how the relays were wired together.
Even today, a lot of the conventions that led to “ladders” are still in use, and I will use a recent example drawing to illustrate this.
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Our syllabus was willed with outdated crap as an electrical engineer i appreciate what you are doing thankyou very much
Hi Tom,
Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback! If you ever have any questions, feel free to reach out to us.
Happy learning!
I am having flashbacks of having to learn this stuff for my engineering program...all I remember is that I didn't really get it...hehe...well...in the end I got my degree...
Not me going through this rn..
This is literally me, but now
Vegeta: "He is speaking the languague of gods"
This is what i was hoping to find when i was searching for a basic video!
the nomenclatures and basic jargon was explained with the available features!
this is the kind of video which is exactly needed for beginners.
Happy to hear that! :) Thanks for sharing your positive feedback with us!
@@realpars 😊😊
I greatly enjoyed this video. Ladder Logic is the underlying basis of all the automation programing we deal with in every program whether it’s its with Rockwell Automation products or Citect Software. I didn’t start off as a programmer but cane from Operations and being a Technician. I’ve been in automations 5 years now but it’s not only thing I do as it includes Field Service and commissioning of OEM equipment also. But, I’m going to also admit, I’m very slow at reading Ladder Logic as it has to make sense as I’m reading it. My Senoir coworker just zips through it scrolling up and down at lightning speed and I never get how he can read it all so fast. The simple symbol elements I can more easily get. But it seemingly gets very complicated to read and understand when it has the Function Block elements in the ladder to read or understand what exactly it’s saying as well how the bit is programmed especially in ControlLogix which is easier to understand than PLC 500 or the dinosaur of PLC 5. Elements like MOV, LIMS, SQC, EQL and many others as there is a whole chart for all the other ladder rung elements. I honestly think a whole series of videos for ladder logic on how all the common advance Function elements each work or is “read” in a ladder similar to this video could be immensely helpful in learning to read and understand Ladder Logic. My coworker always tells me it’s easy and I know he thinks it is and probably is, but when your not quite clear what it’s even saying as well how that bit is programmed, your not sure how to even read what that programmed bit is saying or doing. Love the video though.
I really appreciate the effort put in this video. This very video made me to click the subscribe button.
Trurly worth watching!
Keep it up!
That's great, Muhammad! Thanks for sharing and happy learning!
Thank you for this video! It's very interesting.
Great to hear! You are very welcome. :)
You guys are the best. I really appreciate the effort which is required to create these videos...
Yeap i also, learn a lot from this chanel look likse now i starting electric engineers just from youtube
Great great beginner explanation, need more such informative videos
Thanks a lot, Dean!
@@realpars anytime, subscribed, make more tutorials for beginners
I love you guys! You are literally saving my life for my PLC exams!!!!❤️
Thats amazing, Laurentju! Happy to hear that.
Very nice !)
Thank you very much!
thanks realpars very informative..
You are very welcome - happy to hear that!
Thanks for the video. I'm taking detailed notes on this.
Great job, Merry! Happy learning and let us know if you have any questions!
Please upload a video for PLC programming using ''analog input and output''
Great content👍
Thanks a lot, Mick! Happy to hear that.
Aside from rushing, I really appreciate these videos... I recently graduated but haven't been hired in this field that I wanted to pursue since school. Now that I have the chance to do so, some of the knowledge I had has slipped away x.x, so thanks RealPars for these videos. I am forever grateful. 💖
Hey!
Thanks a lot for your kind compliment! We are always extremely happy to hear such positive feedback!
If you ever have any questions, feel free to reach out to us.
Happy learning!
💖💖💖
Thanks for explaining this so well, and the conventions.
As a computer engineer, I'm finding myself going back to learn this more mature tech, in today's heavy robot automation.
I see why these PLCs are still very useful, say, over writing a safety motor control program on scratch in Python or C, or creating some FPGA approach.
If I understand correctly, between the physical switches and the make and brake symbols of a plc, the bits mediate. The bits have an initial value of '0', so it coincides with the normally open state of a contact, while the same is not true of the initial closed state of a contact in the ladder diagram, which for any contact to open, the input bit must change from 0 to 1
The symbols ,themselves, the narrator shows ( at 4:06 etc.) are not physical "contacts". They are parts of a logical software program ( rungs) that read input values from contacts! look-up "Jim Pytel" videos for true clarity.
Jim Pytel is the real deal, him alone can rival this whole channel. Favorite channel by far in all of youtube
Thanks for making my profession very interesting,,, real Pars
You are very welcome, Kiran! Happy to hear that you are enjoying our content.
Thank you..Sir
You're very welcome!
Bien explicado el video
Late to the party. How does the auto-running coil close the auto-running switch? Also, how does the auto-stop switch open the auto-running switch? Thank you.
In ladder logic, a coil is used to set a memory bit, like Auto-Running (see 4:36 in the video). So when the Auto-Running bit is set ON by the coil, the memory location Auto-Running is true, so the contact Auto-Running is true as well. When the logic indicates that the Auto-Running bit should be OFF (as when the Auto-Stop pushbutton is pressed), the contact Auto-Running will also be OFF. The Auto-Stop bit is a normally closed contact, so when the Auto-Stop switch is pressed or energized, the NC contact goes OFF, or FALSE. This makes the downstream logic FALSE as well, including the coil.
@@realpars great makes sense. Thank you.
Yeah it's great.
And I received a lot of information from this channel. And if you provide subtitles then it will be out standing.
Hi Ganesh,
Great to hear that our course videos have been so beneficial to you!
We currently only provide our course videos in English, you are always able to turn on the English subtitles as that might make it a bit easier for you.
Happy learning
subtitles are already there, just press CC button in right corner of the video (next to pause/play and volume button)
One of my favourite channel in entire UA-cam ❤
Thank you so much!
Can we expect any DCS programming videos in the future?
Maybe :). I should discuss this with the team.
RealPars it would further enrich your already stellar library
DeltaV?
4 days now with this ladder logic and still it literally confuses me to death. Believe me… i cant understand what and how it wants me to think 😂😂
thank you very much...i love you RealPars
Glad you like them!
thx
I find well structured ST much easier to read; especially for more complex scenario's. For simple stuff Ladder is fine. It's easy for Ladder to become bloated which makes you lose the bigger picture.
I want knows control system for maintenance in building
Thank you sir
Please define ICLX valves and harmonic filter
Thank you realists. I cannot thank you enough
You are very welcome, Binus!
This is what I've been looking for
Awesome! Happy learning.
in video time 7:12, there is a little mistake, last rung isn't correct in Ladder logic, M4 coil must be changed by M3 coil (electrical seal); then it matches with control circuit.
Also, in first rung normally close contact M3, it shouldn't this be normally open?
To be honest, the last rung of both the PLC program and the electrical ladder should be deleted. You should never hold a relay on by its own output.
Would the AutoStop not be Normally Open? Because your actual AutoStop contact is normally closed?
Yes, the AutoStop would typically be a normally-closed contact in the field, requiring a normally-open contact in the logic. For ease of explanation in the video, without getting into the field wiring, we chose to represent it by its logical meaning.
Yea
Very good electrical engineering thank you sir
I love your channel
You have our respect for your efforts
Thanks a bunch
Great to hear! You are very welcome. Happy to hear that you are benefiting from our courses.
i a just starting here. i really like that you are doing. thank you brother.
Great to hear that! Thanks for your support.
Let us know if you have any questions!
@@realpars thank you l really did not expect to hear from you brother. I have to store programming Wastewater management pumps instrumentation I have about two weeks experience from your videos I am a fire alarm Tech electrician thank you for your support you're doing a great job out there
Is it really this simple or is there something I'm missing? lol
Anyways, great video! I'm taking Advanced Manufacturing classes in High School and this helped a LOT.
Glad it was helpful!
Please make video EMS/ BMS SYSTEM
Great suggestion, Vasanth! I will happily pass it on to our course developers.
Thanks for sharing and happy learning!
Thank you for this video
You are very welcome! Happy learning!
make separate video about relays and another for ladder logic, no point making video title lagger logic and then mix all kinda stuff there. first you learn relays in a video, then another video is more advanced which expects viewer to know basics.
Thanks for your topic suggestion, Tomi. I will happily pass your suggestion and feedback on to our course developers.
@@realpars ua-cam.com/video/RMpV5R8wNgw/v-deo.html here's a great example. I like this way. 1.xx is basic, 2.xx advanced and so on. 3.xx would be projects where we use those previously learned skills. :)
Stop button is normally closed (so input is "1" when not pressed), so the "auto stop' contact on ladder diagram on 5.09 need to be NORMALLY OPEN!
Hey! When you are using a normally closed switch as the stop switch, you always need to use a normally closed contact for that switch in the PLC program as well. Go ahead and test this with the simulator. :)
I did it. When stop button is not pressed (so input module gets HIGH or 1), normally closed contact in PLC program blocks. When I press the button, input module gets LOW or 0, NC contact in PLC conducts. This logic needs to be reverse? Or is there something that I do not good?
@@BAras-ug9zq you are correct. The stop switch should be wired to a normally closed contact and will be open when the switch is pressed. Then the plc must use a normally open symbol (ie. XIC) which allows the logic to pass through when the contact is closed ("1") and breaks the circuit to stop the Auto Running when the stop is activated ("0").
You are the best Automation Engineers all over the World
Thanks a lot for sharing your support!
Please can you explain more on how to read ladder logic
Thanks for your feedback, Solomon! I will happily pass this on to our course developers.
Happy learning!
The video content is so excellent, congratulations
Thank you so much!
Very clear explanation...it's more than a school 👍👍
Thanks a lot!
Many thanks real
You're very welcome!
SIMPLY SUPERB
Thank you!
ANOTHER GOOD ONE!...
Thank you!
Thankyou
You're very welcome!
Very good
You're very welcome!
Love you.. thank you.. In school now and love you so much
that helped a lot actually
Glad to hear that!
I work in a large industrial plant, let me tell you these guys are legit! They’re on point! It’s hard to find solid training for this industry these days. I highly recommend subscribing.
Kevin Huffman
what is the scope of industrial automation in future.i am a fresher graduate ,I am interested in automation
Thanks a lot, Kevin! That's an amazing compliment! Happy learning!
Very nice
Thank you so much!
Glad it helped!
So good!
Tuyệt vời!.
Cảm ơn bạn
That’s the core of industrial machinery
Yes! That's where the magic happens.
Thank you so much
You're very welcome, happy learning!
thank you
You're welcome!
Great Information. Thanks
Thanks for your support, Rigo!
🤔 using ladder logic for an elevator, seems logical.
Please use Indonesian.
Hi Setiawan,
Thanks for your comment! We currently only provide our course videos in English, you are always able to turn on the English subtitles as that might make it a bit easier for you.
Our apologies for any inconvenience!
Happy learning!
Make vedeo STL language please
We may consider creating videos on that in the future.
Thanks .......
You are very welcome!
Eu adoro seus vídeos. Thank you!!!
You are very welcome, Wilson!
Awesome
Thanks for watching!
Please subtitle indo please thanks
Hi Ibrahim,
Thanks for your comment! We currently only provide our course videos in English, you are always able to turn on the English subtitles as that might make it a bit easier for you.
Our apologies for any inconvenience!
Happy learning!
Thanks you for your every videos im very very support , big thanks from me
Well explained, thanks. 🐵
Thank you!
Hello there sir do u have any branches here in Philippine?? U guys only give lessons online ?
Hi Essa,
thanks for your comment!
We are a 100% online subscription-based learning platform. You can subscribe to our course library through the following link realpars.com/.
If you have any other questions, please let me know.
Happy learning!
There are many applications (power) that still require mechanical relays or contactors for switching. Solid State Relays become cost prohibitive for switching large currents/voltages.
Thanks for sharing your knowledge and experiences with us, Jess! We appreciate that!