Tuesday , September 14 2021
Programmable Logic Controller
Programmable Logic Controller

PLC Programming Languages

Today, I’m getting to introduce you to differing types of programming languages defined for Programmable Logic Controller (PLC).These languages are useful for designing and implementing sequential control of the programmable logic within the automation system. Let’s study, what are those most used and customary PLC programming languages.

5 differing types of PLC Programming Languages

1. Ladder diagram (LD)

Ladder diagram (LD)

It’s a brief abbreviation as LD and also referred to as Ladder Logic. It’s used with programmable logic controllers. And it’s one among the oldest programming languages for PLC. In the ladder diagram, the programing language use to make the program to regulate the PLC system is understood as Ladder Diagram Language or Ladder Logic Language. Generally, the Ladder Diagram is hottest everywhere the planet (including India). This language is straightforward to find out by employing a gate and a few important programming rules.

Advantage of Ladder Diagram (LD): LD is straightforward logic construction and more reliable than an electronic circuit controller. Easy to find out and skim the program. Every programming symbol performs specific actions. It having good representation for discrete logic. Easy to troubleshoot. Shut down the facility without the switch (i.e. hardware devices). To learn more about Ladder Diagram, and its basics parts, check this tutorial.

2. Instruction List (IL)

IL is another sort of PLC programing language. It uses the mnemonic code. Therefore the syntax of this programing language is straightforward to recollect. In general, AB PLC brand works on the Instruction List (IL) programing language. In an earlier article, I even have mentioned different PLC brands and their software. AB PLC is one among the quality PLC brands.

Advantages of IL: It has a high speed. It takes less memory as compared to other programming languages.

3. Structured Text (ST)

Structured Text PLC language is shortly denoted by the ‘ST’ and ‘STX‘. It uses high-level programing language syntax. The syntax of ST is analogous to the syntax of a high-level programing language with loops, variables, conditions, and operators.

Advantages of ST: ST is extremely easier to know for both novice and experienced programmers. Because of its standard coding format, it’s easy to edit and modify program written in ST language.

4. Function diagram (FBD)

Function diagram (FBD) may be a popular and straightforward thanks to write a program sort of a Ladder Diagram. FBD is represented as a box that consists of variety of lines of code for putting different programming functions. It is a graphical language for programming logic controller. So, it makes your job easy to explain a system.

LS PLC Digital Input Module(XGI-D22A)

5. Sequential Function Charts (SFC)

Sequential function charts (SFC) is additionally a graphical programing language. It’s not a text base. It’s become a well-liked method of accurately specifying sequential control requirements. The advantage of SFC is straightforward to know. Because you’ll visualize what’s happening and when it’s happening within the procedure of the code. The most function of SFC is merely the active parts of the code are executed. Thanks to this, it makes easier to troubleshoot and to vary the code if problems occur. These languages are accepted internationally. Among all of them, mostly the Ladder diagram (LD) programing language is employed within the industry.

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