1、 毕毕 业业 设设 计计 题目题目：PLCPLC 控制十字路口交通灯控制十字路口交通灯 二零一二年五月二十五 I 摘 要 自从交通灯诞生以来，其内部的电路控制系统就不断的被改进。设计方法也开始多种 多样，从而使交通灯显得更加智能化。 可编程控制器(PLC)以微处理器为核心， 普遍采用依据继电接触器控制系统电气原理图 编制的梯形图语言进行程序设计，编程容易，功能扩展方便，修改灵活,而且结构简单， 抗干扰能力强。西门子可编程控制器指令丰富，可以接各种输出、输入扩充设备，有丰富 的特殊扩展设备，其中的模拟输入设备和通信设备更是符合交通灯控制系统的要求与特 点，能够方便地联网通信。 本文选择西门子可编
2、程控制器 S7-200 为核心部件，着重进行硬件接口设计，利用梯形 图和语句表进行编程，实现了十字路口交通灯控制系统的自动化。 关键词关键词： PLC；交通控制； II Abstract Since its birth, the lights of the internal control system is constantly circuit has been improved. Design method is varied, thereby start lights appear more intelligent. Programmable logic controller (PLC)
3、 by microprocessor as the core, generally adopted according to the relay contactor controlling system of electrical schematic diagram of the ladder diagram language program design, programming, easy extension, modification, flexible and convenient, simple in structure, strong anti-jamming capability
4、. Siemens PLC, can meet all kinds of instruction, input output expansion equipment, has the rich special equipment, including expansion of the analog input devices and communications equipment is consistent with traffic control system of the request and the characteristic, can be easily networked communication. This article chooses Siemens S7-200 PLC for the core parts, hardware interface design, use ladder diagram and statements table programming, realized the intersection traffic control
