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目 录
前言..........................................................................................................................................................1
1 绪论......................................................................................................................................................2
1.1 交通信号灯的作用与研究意义...............................................................................................2
1.2 PLC 的产生与发展 ...................................................................................................................3
1.3 PLC 的发展趋势 .......................................................................................................................4
1.4 PLC 的应用领域 .......................................................................................................................5
1.5 PLC 在我国的应用 ...................................................................................................................6
1.6 设计总结...................................................................................................................................6
2 可编程控制器的介绍..........................................................................................................................7
2.1 可编程控制器的重要功能和工作特点..................................................................................8
2.2 可编程控制器的工作特点.......................................................................................................9
2.3 可编程控制器的基本机构..................................................................................................10
2.4 可编程控制器的工作原理...................................................................................................11
3 PLC 指令系统介绍 ..........................................................................................................................12
3.1 PLC 指令系统概述 ...............................................................................................................12
3.2 PLC 指令系统介绍 ...............................................................................................................12
4 十字路口交通灯 PLC 控制器的设计 ............................................................................................14
4.1 十字路口交通灯 PLC 控制系统的控制规定 ......................................................................14
4.2 十字路口交通灯布置图.......................................................................................................14
4.3 系统控制流程图...................................................................................................................17