标准摘要
[中文适用范围]： 向可编程控制器 (PLC) 的最终用户介绍 IEC 61131 系列，并帮助最终用户根据 IEC 61131 系列选择和指定 PLC 设备。本用户指南的主要受众为 PLC [外文原描述]： introduces the end-users of Programmable Controller (PLC) to the IEC 61131 series, and to assist the end-users in their selection and specification of their PLC equipment according to the IEC 61131 series. This user guideline has as its main audience PLC end-users.
英文名称Programmable controllers - Part 4: User guidelines