IEC 61131-3 specifies syntax and semantics for a unified suite of programming resource

Independent standard for industrial automation can be split into common elements and programming languages.

Eelco van der Wal, PLCopen
CD 1508 IEC Software model main NAV

IEC 61131-3 is the first real endeavor to standardize programming languages for industrial automation. With its worldwide support, it is independent of any single company. The third part of the IEC 61131 family, it is a specification of the syntax and semantics of a unified suite of programming languages, including the overall software model and a structuring language. Another elegant view can be seen by splitting the standard in two parts—common elements and programming languages. Common elements—data typing Within the common elements, the data types are defined. Data typing prevents errors in an early stage. It’s used to define the type of any parameter used.

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