目录
摘要..............................................................................................................................................................................I
第一章 绪论 .............................................................................................................................................................1
第二章 可编程器简介 .....................................................................................................................................2
2.1 可编程控制器产生 .......................................................................................................................................2
2.2 PLC 发展.......................................................................................................................................................3
2.3 PLC 基本构造...............................................................................................................................................4
2.4 PLC 工作原理...............................................................................................................................................4
2.5 PLC 重要应用...............................................................................................................................................6
2.6 西门子 S7-200 系列 PLC 编程元件 .........................................................................................................8
第三章 水塔水位控制系统方案设计 ...................................................................................................................11
3.1 老式水塔水位控制 ....................................................................................................................................12
3.2 水塔控制系统工作原理 ..........................................................................................................................12
3.3 水塔水位控制主电路图 ............................................................................................................................12
3.4 I/O 接口分派............................................................................................................................................13
3.5 水塔水位控制系统 I/O 图.......................................................................................................................14
第四章 水塔水位控制系统 PLC 软件设计 .............................................................................................................15
4.1 程序流程图 ..............................................................................................................................................15
