说明：  plc梯形图(LAD)编程手册.zip——本使用手册旨在提供指南，以使用梯形逻辑（LAD）编程语言生成用户程序。 本手册中还包含一个参考章节，阐述了梯形逻辑语言元素的语法和功能。
(plc ladder diagram (LAD) Programming Manual. zip- This manual is intended to provide guidance to use the ladder logic (LAD) programming language that generates the user program. This manual also contains a reference section, describes the syntax of language elements of ladder logic and function.)