What is Ladder Logic?

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Hey guys, this is Martin from Phoenix Contact here. I just wanted to give you a quick reminder that our first beginner PLCnext Technology ladder logic course is now live on the RealPars website and we just released a bunch of new videos. You guys ask what Ladder Logic is?

Well, I’m disappointed to let you know that it almost never involves actual ladders. Ladder Logic was the first-ever PLC programming language and is one of the five IEC 61131 languages. It kind of looks like an electrical circuit diagram rotated by 90°. Originally, Ladder Logic was used to document the design and construction of relay racks used in manufacturing and process control. Today it is quite popular among PLC programmers as it is easy to learn, mimics electrical circuits, and is easy to troubleshoot once deployed.

@phoenixcontact1923

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[Flankymanga]

I have done some projects in ladder logic but as a professional developer i would definitely value the option to use a high level programming language like Python. Python is very popular these days.

[juan-qjge]

Ladder for simple process programming.
Easy to troubleshoot and easy to program.
STL for complex programming like mathematical applications.
I think the combination of the two are the best of the two worlds.
Those that say python, have no idea about industrial development and programming.

[mohamedelnah]

Hi IEC 61131 Standard PLC Programming are 5 :
LD - FBD - ST - IL - SFC
easy one is Ladder but it's take to much size from memory

[hagopboghossian]

Ladder logic is my favorite 😍 because it's simple (logical diagram) you don't have to memorize anything just think logically and it's all done.

[kafukai]

Phyton is much easier language than C, but as Martin has said the IEC-61131 part 3 have 5 formal languages, two of them is Structured Text and Instruction list - it is very powerfull tools if you know how to use the, and the best part they are easier than Phyton, so I don't know why it should contain the usage of python.
On the bottom line, if you are understand the logic it will be the same in every language you would choose.

[Lopanfernando]

I like ladder logic as it is very easy to programme and to understand

[saviournartey]

I think plcnext is the best plc of the future, it can be program in python, C++ and java most of the text languages .

[dwsantx]

I wasn’t aware you’re a handyman…haha. The next must be quite versatile to be used for home repair. 👍👍 Great video and keep it light and cheerful. Thanks

[bitebonumbere]

Nice video Realpars. Please upload manual English subtitles. Thanks.

[bilalabdulla]

I watched your vedios on here and your website i wanna say that your lectures are great
and i wanna participate your course(PLC programming all levels )
i just finished first one wich was free in your website and i have a question
after completing this course can i learn every thing about PLC i mean can i work as plc programmer

and i wanna certificate after completion do you give me certificate ??

[darthenx]

Lol I like how they used a wooden ladder 🪜 as a demonstration that ladder logic is old lol

[yeshinidup]

I would love to see tutorial video of ladder logic.

[alex_nevskiy_]

IMHO Ladder-Logic loses to SCL in complex logics with switch statements, arrays and non-trivial math formulas. In that case it becomes very undeclarative and confusing.

[davebennett]

I could write all of a complex process control program in structured text, but ultimately - I would be the only person able to understand it. In order to work in the real world you must be able to communicate with people across a project who have different backgrounds and experience levels. Some are expert process engineers and know nothing of code, some are expert electricans and know nothing of process logic, etc. Ladder is a language which has the lowest barrier to entry and for that reason - it's valuable. Anyone who claims ladder logic is useless, or that because it visually represents similar logical elements differently than another language, is missing the point entirely.