目 录 前 言 第1 章 PLC 基础指令入门..............................................................................................................1 1.1 PLC 的定义和分类 ........................................................................................................................................1 1.2 PLC 的功能和特点 ........................................................................................................................................2 1.3 西门子PLC 家族产品 ...................................................................................................................................4 1.4 S7-200 SMART PLC 的硬件介绍 .................................................................................................................4 1.5 S7-200 SMART 扩展模块及信号板 .............................................................................................................5 1.6 S7-200 SMART 面板介绍 .............................................................................................................................6 1.7 S7-200 SMART 的功能和特点 .....................................................................................................................8 1.8 S7-200 SMART 外围接线 .............................................................................................................................9 1.9 STEP 7-Micro/WIN SMART 软件安装 ......................................................................................................10 1.10 STEP 7-Micro/WIN SMART 软件基本操作 ............................................................................................ 11 1.11 程序的上传与下载 ....................................................................................................................................12 1.12 硬件组态、符号表、状态表、程序监视 ................................................................................................15 1.13 常开、常闭、基本位逻辑指令以及线圈和脉冲指令的使用 ................................................................16 1.14 定时器 ........................................................................................................................................................20 1.15 计数器 ........................................................................................................................................................21 1.16 基本指令在案例中的使用1 .....................................................................................................................22 1.17 基本指令在案例中的使用2 .....................................................................................................................26 第2 章 数据类型、逻辑运算........................................................................................................28 2.1 数制 .............................................................................................................................................................28 2.2 数据类型BWD 详解 ...................................................................................................................................30 2.3 CPU 存储器数据区划分..............................................................................................................................31 2.4 数据运算、数学功能、递增、递减 ..........................................................................................................31 2.5 数据转换 ......................................................................................................................................................35 2.6 逻辑运算 ......................................................................................................................................................36 2.7 时钟指令 ......................................................................................................................................................37 2.8 功能指令在案例中的使用1 ............................................................