![]() What is the Best PLC Programming Language You can use?Īlthough Ladder logic is still the most commonly used language by many PLC programmers, and for good reasons, because you can use LAD to program almost most of the logic you need for your application, a small portion of your logic might need other languages like SFC or ST. So you can see that each PLC programming language is important and needed for certain applications. And also with SFC, it was easier to program large processes once we divided them into smaller partitions or STEPs. Also, when we needed to do more complex mathematical calculations and deal more comfortably with data manipulation the need for ST began to show. ![]() The other thing you should know is that these languages were developed naturally when automation evolution needed new ways to program our PLCs, for faster and easier solutions for the needs of industrial processes, and when new automation requirements began to be a challenge for older PLC languages.įor example, FBD started to be in need when our logic became so large and needed to be represented into blocks to be easier to read and understand. Why there are so many PLC Languages?įirst, that is not too many, and with the high number of PLC manufacturers, and the many more models of PLCs, it is good that the IEC standard only allowed these 5, otherwise, each manufacturer would have used their own special language and that would have made it very hard for programmers and also for integration of different brands with each other. Disadvantages of Sequential Function Chart Easier online debugging, as you can see exactly at which step your logic stopped.Useful for large processes that you can break into major steps.Unlike a traditional flow chart, SFC can have multiple paths (branches), and you can use branches to execute multiple steps at one time. Ladder diagram or ladder logic is the most popular and most commonly used PLC programming language, it was designed to mimic the hardwired relay logic systems, and that is why it is very easy to read and understand for electricians and electrical engineers. SFC (Sequential Function Chart) Ladder Diagram (LD).Conclusions What are the 5 different PLC Languages?Īccording to the IEC (International Electrotechnical Commission), Section 61131-3 Standard there are 5 approved PLC languages, this part of IEC 61131 specifies the syntax and semantics of a unified suite of programming languages for programmable logic controllers (PLC).What is the Best PLC Programming Language You can use?.What are the 5 different PLC Languages?.
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