摘要就如何应用PLC实现十字路口交通信号灯自动控制的设计展开讨论，通过分析对交通信号灯的控制要求，对PLC控制系统进行了软、硬设计。同时将PLC的逻辑控制、数据运算、数据比较、数据传送通过程序有机的结合起来，既控制交通灯的变化，还有时间显示。ApplicationofPLConhowtoachievethedesignofintersectiontrafficsignalcontroldebateandtheanalysisofthetrafficsignalcontrolrequirementsofaPLCcontrolsystemsoftwareandhardwaredesign.WhilePLClogiccontrol,dataoperations,datacomparison,datatransmissionthroughtheprocessofcombiningorganicandnotonlycontrolthetrafficlightchanges,aswellasthetimedisplay.关键词：PLC信号灯控制系统KeyWords:PLCasignallanterncontrolsystem目录摘要....................................................................2目录....................................................................4第一章引言...........................................................51.1选题背景..........................................................51.2意义.............................................................101.3主要方法.........................................................131.4重点要解决的问题.................................................131.6原始资料要求.....................................................151.7具体要求.........................................................162．系统单元设计..........................................................172.1I/O连线图........................................................172.2程序正常时期.....................................................172.3程序高峰时期.....................................................212.4指令表.......................................................................................................................243设计说明书..........................................................................................................................273.1定时器（绿灯闪烁）...............................................................................................273.2晚间黄灯闪烁...........................................................................................................283.3急停..........................................................................................................................283.4结束..........................................................................................................................293.5顺序功能图...............................................................................................................293.6交通灯示意图...........................................................................................................304.结论.....................................................................................................................................315.致谢.....................................................................................................................................316．参考文献..........................................................................................................................327.附录完整梯形图................................................................................................................34第一章引言1.1选题背景1.1.1PLC简介可编程控制器简称——PLC是以微处理器为基础，综合了计算机技术、自动控制技术和通讯技术发展而来的一种新型工业控制装置。它具有结构简单、编程方便、可靠性高等优点，已广泛用于工...
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