毕业论文PLC控制交通灯设计学生姓名：学号：年级专业：指导老师：二级学院：提交日期：2017年5月目录目录......................................................................................................2摘要......................................................................................................41.41PLC的工作原理：..........................................................................81.42结构：..............................................................................................8PLC的基本结构框图如下......................................................................81.5PLC的硬件介绍及选型.........................................................................91.51硬件介绍.........................................................................................91.52PLC系统的其它设备.....................................................................121.53PLC的通信联网...........................................................................121.6S7-200系列PLC的基本指令................................................................131.61逻辑取及输出线圈指令（LD、LDI、OUT）............................131.62单个触点串联指令（AND、ANI）..............................................131.63S7-200系列PLC的定时器指令................................................15S7-200系列的定时器指令....................................................................171.7S7-200系列编程软（STEP7-Micro/WIN）编程软件..........................171.71STEP7-Mirco/WIN窗口组件.......................................................17图1.71STEP7-MICRO/WIN32的主界面...........................................181.72编程准备......................................................................................181.73STEP7-Mirco/WIN主要编程功能与程序的上载下载..............191.74程序的调试与监控....................................................................211.8顺序功能图(SFC)..................................................................................22第2章：交通灯控制要求..................................................................232.1路况示意图（模拟图）2．1交通灯示意图.........................232.2工作要求和过程.....................................................................................23主要工序要求如下：....................................................................................232.3根据交通灯示意图模拟控制实验.........................................................24第3章交通灯控制的设计................................................................243.1顺序功能图.............................................................................................243.2I/O分配及接线图...................................................................................25................................................................................................................26图3.1交通灯顺序功能图.....................................................................26根据输入输出分配表画出接线图，如下：........................................273.3编制程序..............................................................................................28指令表如下............................................................................................303.4交通灯时序波形图...................................................................................
