目录
1 概述..................................................................................................................................................1
2 可编程逻辑控制器..........................................................................................................................2
2.1 PLC 的定义...........................................................................................................................2
2.2 PLC 的功能...........................................................................................................................3
2.3 PLC 的特点...........................................................................................................................3
2.4 PLC 的基本组成...................................................................................................................3
2.5 PLC 的工作原理...................................................................................................................4
2.6 S7-200PLC 系统的基本组成...............................................................................................5
3 硬件设计..........................................................................................................................................7
3.1 控制要求...............................................................................................................................7
3.2 可编程序控制器的控制系统设计.......................................................................................8
3.2.1 PLC 控制系统的设计原则.......................................................................................8
3.2.2 PLC 控制系统的设计内容及步骤...........................................................................8
3.2.3 接通延时定时器（TON）.......................................................................................9
3.3 选择 PLC 型号....................................................................................................................10
3.3.1 I/O 点数的估计........................................................................................................10
3.3.2 用户存储器容量的估算..........................................................................................10
3.3.3 CPU 功能与结构的选择.........................................................................................11
3.3.4 机型选择..................................................................................................................11
3.4 系统设计流程示意图.........................................................................................................11
3.5 I/O 分配表...........................................................................................................................12
3.6 I/O 接线...............................................................................................................................13
4 软件设计........................................................................................................................................14
4.1 程序设计的主要内容.........................................................................................................14
4.2 程序设计的步骤.................................................................................................................14
4.3 设计梯形图.........................................................................................................................16
4.3.1 梯形图编程语言概述..............................................................................................16
4.3.2 梯形图指令程序......................................................................................................16
4.4 设计语句表.........................................................................................................................18
5 调试................................................................................................................................................19
6 结束语............................................................................................................................................20
参考文献...........................................................................................................................................21
