本书介绍了西门子S7-200PLC的硬件特性、编程元件、基本指令及功能指令，STEP7-Micro/WIN编程软件的安装、功能以及程序的调试运行,S7-200PLC的通信网络、PID闭环控制、PLC的工程应用等内容；重点阐述了控制程序梯形图的设计方法，使读者较快地掌握一套系统的编程方法。书中还介绍了应用控制系统设计规则、安装和维护，提供了S7-200PLC的工程应用案例，为学生将来从事自动化技术工作打下良好的基础。书中各章配有习题。

目
前言第1 章 可编程序控制器基础························ 1
1.1
可编程序控制器的基本概念与硬件结构················································· 1
1.1.1
可编程序控制器的基本概念··············· 1
1.1.2
可编程序控制器的硬件结构··············· 1
1.2
可编程序控制器的特点、主要功能及性能指标··································· 3
1.2.1
可编程序控制器的特点······················· 3
1.2.2
可编程序控制器的主要功能及性能指标·················································· 4
1.2.3
S7-200 PLC 概述·································· 6
1.2.4 S7-300/400 PLC 的概述······················· 8
1.3
可编程序控制器的工作原理与编程语言··············································· 10
1.3.1
可编程序控制器的工作方式············· 10
1.3.2
可编程序控制器的扫描工作过程·······11
1.3.3
可编程序控制器的编程语言··············11
1.4 可编程序控制器的应用及发展······· 14
1.4.1
可编程序控制器的应用领域············· 14
1.4.2
可编程序控制器的发展方向············· 14
思考与练习····················································· 15 第2章 S7-200 PLC 硬件的组成················· 16
2.1
S7-200 PLC 的系统组成···················· 16
2.1.1
S7-200 PLC 的系统基本构成············· 16
2.1.2
主机单元············································ 17
2.1.3 数字量扩展模块································ 18
2.1.4 模拟量扩展模块································ 20
2.1.5
通信模块及智能模块························· 23
2.1.6
其他设备············································ 26
2.2
S7-200 PLC 的性能特点及基本功能························································ 27
2.2.1 S7-200 PLC 的主要技术性能指标······················································· 28
录
2.2.2
S7-200 PLC 的输入/输出特性············29
2.2.3
存储系统·············································34
2.2.4
S7-200 PLC 的工作方式·····················36
思考与练习······················································36 第3章 S7-200 PLC 的基本指令··················37
3.1 S7-200 PLC 的内部元件及程序结构························································37
3.1.1
S7-200 PLC 的基本数据类型·············37
3.1.2
S7-200 PLC 的寻址方式·····················38
3.1.3
S7-200 PLC 的编程元件·····················40
3.1.4
S7-200 PLC 的程序结构·····················45
3.2
S7-200 PLC 的基本逻辑指令···········46
3.2.1
位逻辑指令·········································47
3.2.2
定时器指令·········································57
3.2.3
计数器指令·········································61
3.2.4
定时器及计数器指令的使用扩展·······64
3.2.5
移位寄存器指令·································65
3.2.6
比较触点指令·····································67
3.2.7
顺序控制指令·····································68
3.3
S7-200 PLC 的运算指令····················69
3.3.1
加、减、乘、除指令与加1、减1 指令····················································70
3.3.2
数学功能指令·····································76
3.3.3
逻辑运算指令·····································77
3.4
S7-200 PLC 的数据处理指令···········79
3.4.1 数据传送指令·····································79
3.4.2 字节交换指令·····································80
3.4.3
字填充指令·········································81
3.4.4
移位和循环移位指令··························81
思考与练习······················································83 第4章 S7-200 PLC 的功能指令··················86
4.1 S7-200 PLC 的指令规约····················86
4.1.1
使能输入与使能输出··························86
4.1.2
梯形图中的网络与指令······················87
目 录
4.2
程序控制类指令·································· 87
4.3
局部变量表与子程序························· 90
4.3.1
局部变量表········································ 90
4.3.2
子程序的编写与调用························· 91
4.4
数据处理类指令·································· 93
4.4.1 数据转换指令···································· 93
4.4.2
表指令················································ 96
4.4.3
时钟指令············································ 98
4.4.4
字符串指令········································ 99
4.5
中断程序与中断指令························· 99
4.5.1
中断源·············································· 100
4.5.2
中断优先级······································ 102
4.5.3
中断指令············································ 102
4.6
高速计数器与高速脉冲输出指令·························································· 103
4.6.1
高速计数器的工作模式与输入端口····················································· 103
4.6.2
高速计数器指令······························ 106
4.6.3
高速计数器的程序设计··················· 107
4.6.4
高速脉冲输出·································· 108
思考与练习··················································· 109 第5章 S7-200 PLC 程序设计方法···········110
5.1
编程原则··············································110
5.1.1
程序设计内容···································110
5.1.2
程序设计步骤···································111
5.1.3
编程基本规则···································111
5.2 基本电路编程·····································114
5.3
经验设计法········································· 120
5.3.1
基本方法·········································· 120
5.3.2
设计举例·········································· 120
5.4
顺序控制设计法································ 123
5.4.1
顺序功能图的组成··························· 124
5.4.2
顺序功能图的实现··························· 126
5.4.3
顺序功能图的注意事项··················· 136
5.5
使用起保停电路的编程方法·········· 136
5.5.1
编程方法·········································· 136
5.5.2
虚拟步的应用·································· 137
思考与练习··················································· 139 第6章 S7-200 PLC 的通信及网络·········· 140
6.1
通信基础知识·····································140
6.1.1
基本概念和术语·······························140
6.1.2
异步串行通信接口标准····················141
6.2
计算机通信网络及拓扑结构··········143
6.2.1
构成局域网的四大要素····················143
6.2.2
网络协议和体系结构························146
6.2.3
现场总线概述···································147
6.3
西门子SIMATIC NET······················149
6.3.1
西门子工业以太网···························150
6.3.2
PROFIBUS 现场总线························151
6.3.3
AS-i 现场总线···································151
6.4
S7-200 PLC 的网络通信··················152
6.4.1
S7-200 PLC 的通信协议···················152
6.4.2
S7-200 PLC 的通信网络配置···········153
6.4.3
PPI 网络的组成形式·························155
6.5
S7-200 PLC 的网络应用··················156
6.5.1
网络指令及应用·······························156
6.5.2
自由口指令及应用···························157
6.6
USS 协议控制电动机驱动器··········161
6.6.1
使用USS 协议的优点······················161
6.6.2
USS 通信硬件连接···························161
6.6.3
USS 协议的通信报文结构················162
6.6.4
利用基本指令实现USS 通信的编程··················································163
6.7
使用USS 协议库控制MicroMaster 变频器·························164
6.7.1
使用USS 协议专用指令的要求·······164
6.7.2
与变频器通信的时间要求················165
6.7.3
使用USS 协议指令的步骤···············165
6.7.4
USS 协议指令···································165
6.7.5
连接和设置4 系列MicroMaster 变频器···············································168
思考与练习····················································170 第7章 STEP 7-Micro/WIN编程软件·······171
7.1 编程软件概述·····································171
7.1.1
编程软件的安装与项目的组成········171
7.1.2
通信参数的设置与在线连接的建立······················································174
7.1.3
帮助功能的使用与S7-200 的出
西门子PLC 编程及应用
错处理·············································· 176
7.2
程序的编写与传送··························· 179
7.2.1
编程的准备工作······························ 179
7.2.2
编写与传送用户程序······················· 180
7.2.3
数据块的使用·································· 182
7.3
用编程软件监控与调试程序·········· 183
7.3.1
基于程序编辑器的程序状态监控···· 183
7.3.2
用状态表监控与调试程序··············· 186
7.3.3
用状态表强制改变数值··················· 188
7.3.4
在RUN 模式下编辑用户程序········· 188
7.3.5
调试用户程序的其他方法··············· 189
7.4
使用系统块设置PLC 的参数········ 189
7.4.1
断电数据保持的设置······················· 189
7.4.2 创建CPU 密码································· 190
7.4.3
输出表与输入滤波器的设置··········· 192
7.4.4
脉冲捕捉功能与后台通信时间的设置·················································· 193
7.5
S7-200 PLC 仿真软件的使用········· 194 思考与练习··················································· 196
第8章 S7-200 PLC 控制系统的设计 与应用·············································· 197
8.1
PLC 控制系统设计简介·················· 197
8.1.1
系统设计的原则······························ 197
8.1.2
系统设计和调试的主要步骤··········· 198
8.2
PLC 应用系统的可靠性措施········· 200
8.2.1
安装和布线······································ 200
8.2.2
控制系统的接地······························ 202
8.2.3
抑制电路的使用······························ 203
8.2.4 S7-200 PLC 的电源计算与抗干扰······················································205
8.3
节省PLC 输入/输出点数的方法···························································206
8.3.1
减少输入点数的方法························206
8.3.2
减少输出点数的方法························207
8.4
S7-200 PLC 的模拟量PID 控制及应用··················································207
8.4.1
PID 算法简介····································207
8.4.2
PID 回路指令····································209
8.4.3
应用举例···········································212
8.5
运输机顺序控制系统························214
8.5.1
控制要求···········································214
8.5.2
系统设计···········································214
8.6
反应池送液控制系统························217
8.6.1
控制要求···········································217
8.6.2
系统设计·············································217
8.7
电梯控制系统·····································220
8.7.1
控制要求···········································220
8.7.2
系统设计···········································221
8.8
炉温控制系统·····································223
8.8.1
控制要求···········································223
8.8.2
系统设计···········································224
8.9
组合机床动力滑台控制系统··········228
8.9.1 控制要求···········································228
8.9.2 系统设计···········································229
思考与练习····················································231 参考文献·····························································233