Attention

IronPLC supports IEC 61131-3 Structured Text excluding I/O mapping.

Language Reference

IronPLC implements the IEC 61131-3 standard for programmable logic controller programming. This reference covers the language elements shared across all IEC 61131-3 programming languages and the language-specific syntax for each supported language.

Tip

Many examples on these pages are interactive — you can edit and run them directly in the IronPLC Playground.