设计采用了国内使用较为广泛的三菱系列PLC为样机。完成对交通灯的系统控制
设计，并详细介绍PLC的型号选择，如何进行程序的编程和设计的及PLC的安装，运行调试维护与故障诊断等。
关键词： PLC 交通灯 自动控制 自动循环
The programmable preface controller (the programmable controller, English
abbreviation PC, behind be called PLC again ) takes ting processing as foundation, synthesizing the calculator technique ,the semi-condnctor integration teachnique, automatic control technique ,numerical technique and corresponds by letter a kind of in general use in dustrial auto control that the network technique development get up to equip .It almost replaced after the usage of the electric appliances. BEcriticize to automate a control of the modern industry of three big one of the pillars, be used as a study especially for 21 centuries electricity university to living to control its usage operation is very important, is an essential to have .
This design uses the PLC completion to carry on an automatic control to the
transportaion light , for reducing the injury to ward the traffic policeman and going through smoothly to the vehicle . This equipments adopted the equipments of the automatic control ,being south north of red light bright , the green light of the thing also bright , be the traffic lights trans for mation , the yellow light gleams three times . When the procedure is for the first time carry on finish , the procedure auto circulation . Designing to adopt the domestic usage more extensive Mitsubishi series PLC is a kind machine. Complete the system control toward the transportation light design , and introduced a PLC model number a choice in detail , how carry on the plait distance of the procedure and design of and PLC gearing , circulate , adjust to try a maintenance and break down to examine a patient ….etc….
Key word : PLC . The transportation light controls . Auto matically. The auto circulation .
第一章 PLC方面的简介
PC是一种为工业控制而设计的专用计算机，它的系统组成与微型计算机相似。同
样是由硬件和软件组成。为了适应恶劣的工作环境并能取得很高的可靠性，多功能，使用方便等要求，其硬件配置和系统程序，应用软件又与微型计算机有很大的区别。
1.1 PLC 的硬件及作用
PLC的硬件主要有：中央处理器（CPU），存储器，输入 / 输出（I/O）接口，电
源等。下图
电源 来自用户设备输入接口中央处理器 输出接口至设备 外围接口 存储器 编程器
中央处理器（CPU）
它是CPU的核心，是按PLC中系统程序赋予的功能，指挥PLC有条不紊地进行
工业生产。其主要任务有：控制从编程器键入的用户 程序和数据的接收与存储；用扫描的方式通过I/O部件接收现场的状态或数据并存入输入映像存储器或数据存储器中；诊断
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