IEC 61131-3:2013 Archived: 2026-04-05 17:44:08 UTC IEC 61131-3 Revised IEC 61131-3:2013 Programmable controllers - Part 3: Programming languages IEC 61131-3:2013 specifies the syntax and semantics of a unified suite of programming languages for programmable controllers (PCs). This suite consists of two textual languages, Instruction List (IL) and Structured Text (ST), and two graphical languages, Ladder Diagram (LD) and Function Block Diagram (FBD). This third edition cancels and replaces the second edition, published in 2003 and constitutes a technical revision. It includes the following significant technical changes: It is a compatible extension of the second edition. The main extensions are new data types and conversion functions, references, name spaces and the object oriented features of classes and function blocks. Share by email Technical committee TC 65/SC 65B Measurement and control devices Keywords Water automation - Water management - Smart city Publication type International Standard Publication date 2013-02-20 Edition 3.0 ICS 25.040.40 35.240.50 Withdrawal date 2025-05-22 ISBN number 9782832206614 Pages 464 https://webstore.iec.ch/publication/4552 Page 1 of 2 File size 3.41 MB Source: https://webstore.iec.ch/publication/4552 https://webstore.iec.ch/publication/4552 Page 2 of 2