IEC 61131-1:2003适用于可编程控制器（PLC）及其相关外围设备，如编程和调试工具（PADT）、人机界面（HMI）等，其预期用途是控制和指挥机器和工业过程。它给出了本标准中使用的术语的定义。它确定了可编程控制器系统的主要功能特性。第二版取消并取代1992年出版的第一版，并构成技术修订。该双语版本（2012-05）对应于2003-05年出版的单语英语版本。

IEC 61131-1:2003 applies to programmable controllers (PLC) and their associated peri-pherals such as programming and debugging tools (PADTs), human-machine interfaces (HMIs), etc., which have as their intended use the control and command of machines and industrial processes. It gives the definitions of terms used in this standard. It identifies the principal functional characteristics of programmable controller systems. This second edition cancels and replaces the first edition published in 1992 and constitutes a technical revision. This bilingual version (2012-05) corresponds to the monolingual English version, published in 2003-05.