IEC-61131-3

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IEC-61131-3 is a standard for PLC programming languages. The standard includes the definition of the Sequential Function Chart language, used to structure the internal organization of a program, and four inter-operable programming languages: Instruction List, Ladder Diagram, Function Block Diagram and Structured Text. Via decomposition into logical elements, modularization and modern software techniques, each program is structured, increasing its re-usability, reducing errors and increasing programming and user efficiency.

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