A practical guide to IEC 61131-3 — the international standard that defines the five PLC programming languages: Ladder Diagram, Structured Text, Function Block Diagram, Instruction List, and Sequential Function Chart.
IEC 61131-3 is the third part of the IEC 61131 standard for programmable controllers, published by the International Electrotechnical Commission. It defines five programming languages for PLCs (Programmable Logic Controllers) and DCS (Distributed Control Systems), along with a programming model (programs, function blocks, tasks, and resources) designed to promote portability between different vendors' systems.
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