目 录
绪论 ......................................................................................................................................1
1 PLC 的根底 .......................................................................................................................2
PLC 的特点 .................................................................................................................2
PLC 的结构和工作原理 .............................................................................................3
PLC 的根本结构 ..................................................................................................3
PLC 的工作原理 ..................................................................................................4
2 西门子 S7-200 系列 PLC 的硬件单元............................................................................6
主机 .............................................................................................................................6
CPU 的主要特点..................................................................................................7
存储系统 ..............................................................................................................7
扩展单元 .....................................................................................................................7
特殊功能模块 .............................................................................................................8
内部软元件 .................................................................................................................9
根本指令 ...................................................................................................................10
3 系统的设计与仿真 ........................................................................................................12
控制要求 ...................................................................................................................12
硬件设计 ...................................................................................................................13
交通信号灯 PLC 的输入/输出点的分配表 ......................................................13
交通信号灯 PLC 控制硬件接线图 ...................................................................13
软件设计 ...................................................................................................................14
交通信号灯 PLC 控制梯形图 ...........................................................................14
交通信号灯 PLC 控制的指令表 .......................................................................15
程序说明 ............................................................................................................16
交通信号灯的状态波形图 ................................................................................17
结论 ....................................................................................................................................18
参考文献 ............................................................................................................................19
致 谢 ................................................................................................................................20
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