The 5 Most popular PLC programming languages nowadays

The 5 most popular PLC programming languages nowadays

How are PLCs programmed?

Basically, the PLC program is an intermediate link between the input and output devices connected to the PLC. The following are the types of PLC programming languages: ● ● ● ● ●

Ladder diagram (LD) Function Block Diagram (FBD) Sequential Function Charts (SFC) Structural Text (ST) Instruction List ( IL)

Ladder diagram (LD) or the Ladder Logic Programs: This is the most popular and preferred type of PLC programming language. Since PLCs are programmed with the basic relay logic, the ladder logic uses simple normally open (NO) normally closed (NC) and other lines of code instructions.

One can actually witness the process logically through the “Rungs� and data arriving as inputs to the components of PLC.

Function Block Diagram (FBD): FBD programming language is used for multiple repetitive functions like starters, closed-loop control, PID loops, etc. Each component of the FBD is connected to the preceding component’s output.

In this, the data flows in a nested manner from one block to the other virtually. The identifiers, keywords, variables, and data types need to be taken care of in this type of programming.

Sequential Function Charts (SFC): The SFC similar to LD and FBD, and one of the graphical programming languages for PLC. SFC is used to write concurrent programs between steps and transitions. These conduct actions based on logical conditions.

This programming language has logic like that of a flow chart. The program is divided into steps.

And, the steps can either be active or inactive.

Structural Text (ST): This programming is very similar to that of high-level languages like Basic, Pascal, or C. This is a great choice for implementing complex algorithms and mathematical logic. It is very easy to make modifications in this program as per the standard format.

The common set of instructions in this programming language are IF, WHILE, CASE, RETURN, FOR, REPEAT, etc.

Instruction List ( IL): This is an assembly language type of PLC programming language. It has a high level of execution speed. As compared to others, IL has very low memory consumption. It makes use of the concept STACK. The mnemonic codes are usually used for IL-based PLC programming like: ANB ORB LDA ANI

In Conclusion: PLCs have played a pivotal role in the automation of various industries and deserve credit for the same. The matter of deciding which PLC programming language is the best for you depends on the complexity of your problem at hand. Each of these programming languages serves its own unique purpose.

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