学院：信息学院专业：电子信息工程学号：20091060197姓名：马凤飞指导教师：谢汝生2011年12月5号【摘要】:针对近年来城市交通的拥挤现象，特别是驾驶员违章严重、---本文来源于网络，仅供参考，勿照抄，如有侵权请联系删除---交通事故频发、车辆尾气污染等问题，介绍集计算机、信息、电子及通讯等众多高新技术手段于一体的智能交通指挥中心控制系统。该系统的安装及使用，大大缓解了城市道路堵塞现象、提高了道路的通行能力。减少了驾驶员违章的次数，抑制了交通事故的发生、同时能够减轻车辆尾气排放，从而对降低环境污染起到了不可低估的作用。分析现代城市交通控制与管理问题的现状，结合城乡交通的实际情况阐述了交通灯控制系统的工作原理，给出了一种简单实用的城市交通灯控制系统的硬件电路设计方案。【关键词】:交通控制交通灯PLC控制机【Abstract】:Inrecentyears,forurbantrafficcongestion,especiallydriversofseriousviolations,thefrequenttrafficaccidents,vehicleexhaustpollution,introducedthesmall-computer,information,electronicsandcommunicationsandotherhigh-techmeansinoneoftheintelligenttrafficcontrolcenterSystem.Thesystem,andtheuseofandgreatlyeasetheurbanroadcongestion,increasedroadcapacity.Toreducethenumberofillegaldriverstocurbtheoccurrenceoftrafficaccidentsandatthesametimetoreducevehicleemissions,thusreducingenvironmentalpollutionHaveplayedaroleshouldnotbeunderestimated.Analysisofthemodernurbantrafficcontrolandmanagementofthestatusquo,combinedwiththeactualsituationofurbanandruraltransportonthetrafficlightcontrolsystemworkingprinciple,givenasimpleandpracticalurbantrafficlightcontrolsystemhardwaredesign.【Keywords】:trafficcontroltrafficlightsPLCcontrol目录---本文来源于网络，仅供参考，勿照抄，如有侵权请联系删除---序言..................................................................................................................................................3一、PLC的概述..............................................................................................................................4（一）PLC的产生和定义......................................................................................................4（二）PLC的基本组成..........................................................................................................4二、PLC的硬件与工作原理..........................................................................................................6（一）PLC的硬件结构..........................................................................................................6（二）CPU模块中的存储器.................................................................................................7（三）PLC的工作原理..........................................................................................................8三、PLC的特点与应用领域.........................................................................................................10（一）PLC的特点................................................................................................................10(二)PLC的应用领域..........................................................................................................11（三）PLC的前景................................................................................................................11四、PLC的程序设计基础.............................................................................................................12（一）PLC中的程序结...