基于PLC的交通灯控制系统设计外文翻译Word文档格式.docx

基于PLC的交通灯控制系统设计外文翻译Word文档格式.docx

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专 业 电气工程与自动化学生姓名

学 号 2009022388

指导教师

职 称 讲师

二〇一三年六月

PLC-baseddesignoftrafficlights

Abstract:

Onekindoftrafficlightcontrolsystemusingprogrammablelogiccontroller（PLC）,viasoftwarecontroltrafficlightsrunautomatically.Inthesystem,theoriginallineistheprograminsteadoftherelay,programmablelogiccontroller（PLC）systemhardwareandsoftwareresourcestobefairuse.NormaloperationandemergencytransportforadetaileddescriptionandfromtheEastandWestemergenciescanbemutuallylinked.Trafficsignalsystemsandtwoseven-segmentdigitaldisplayinthecountdownorder;

alsodiscussedindetailthewiringofthehardwareandPLCladder.TrafficlightsatthecrossroadsoftheremotemonitoringsystemdesignconfigurationsoftwareMCGS,real-timemonitoringoftrafficlights,greatlyimprovingthereliabilityofdatatransmission.Atthesametime,wecanconfigurethetrafficlightstochangethestatusofphotographs.

Keywords:

switchingpower,supplyprotection,circuitsystemdesign

13

1.Introduction

Withthesocialdevelopmentandprogress,trafficflowbecomesincreasinglyimportant.Ontheonehand,toomanycrossroads,moreandmorevehicles,whicharecausingserioustrafficcongestion.Ontheotherhand,inthelimitedtimeitisnecessarytomaintainthevehicleandpedestrianfastandsafe.Therefore,onekindoftrafficlightcontrolsystemdesign,canbeusedtodisplaytimecountdown,withcomputercontrolledreal-timedata.Inaddition,theconfigurationtechnologyforreal-timeimagesthatreflectthetrafficlights,understandthehistoricalcrossroadsofworktogettrafficlightsvisualization.Thesystemconsistsofhostcomputerandalowcomputer.MCGSconfigurationisinstalledinthehostcomputerislowerbythePLCcontrolsystem.

NormaltrafficsignaltimingdiagramshowninFigure1.Buttherearesomeurgentmatters,forexample.Thereareanumberofambulancestotransportpatientstothehospitalortodealwithanumberoffireenginesandfire.Fireenginesandambulancesrushedtotakeprecedenceoverothertrafficscene.Accordingtourbantrafficcontrolsystem,undernormalcircumstances,twocontrolmethodsandurgencytrafficcontrolfactorsintoaccount.Thisprocesscanshow14segmentencoder.U.S.trafficlightsinstantrecordofthemonitoringprocess.

Emergencycontrolsignalstocontroltrafficemergencyswitch.Ifthereisnoemergencylightsallwork,butwhenanemergencyopen.Inthiscase,thecarisurgentprioritypass.Oncetheemergencyvehiclepasses,emergencyswitchoffimmediately.Thegreenlightinthesamedirectionofthevehiclequicklyflashesthreetimes,followedbythenormaloperation.Ifyouwerefromthenorth-southandeast-westtwoemergencyvehicles,trafficcontrolsystemscanrespondquicklycameearly,andthenanother.

2.TrafficControlSystemDesign

A.Hardwaredesign

CP1HseriesPLCascontroller,displaytheprocedureshouldstopwhenthetimeseriesofabnormalsystemoperation,thetimewillnotbedisplayed.Whentheemergencyproceduresarecompletedtimeseries,countdowndisplayprogramshouldbereset.At220VACsystemisusedtocontroltrafficlights,24VDCcontrolsegmentencoder,Figure2showstheschemeEasterntimedisplay.CP1Hseriesprogrammablelogiccontroller（PLC）isasimplecontroller,whichconsistsof24inputsandsixteenoutputs.BecausetheoutputtotwentyInthissystem,anI/O

modulemustbeextended.CircuitisshowninFigure2.

B.ControlProgramDesign

Sixtimersandtwospecialnormalopenpulseisusedinthissystem,thegreenlightflashesforallnorth-southandeast-timerandaspecialpulse;

eightkindsof

interlockinginternalrelayisusedtoimplementtheurgencyandtransmitpulsetwodirectionstoPLC,showninthefigure.TwoSDECinstructionsareusedtodisplaythecountdowndisplaythecorrespondinglight.Asanimportantpartofthecountdowndisplayprogram,eastandwestofthegreenlightreflectedintheview4intheseprogramsdownloadedtotheprogrammablelogiccontroller（PLC）,allthetrafficlightsrunningaccuracy,urgency,andthingscanbeinterlockedfromnorthto southstrictly,allthelightscanbesetbacktotheurgencyofpassingstate.Therefore,thesecontrolprogramiscorrect,simple.

C.MonitoringSystem

Computersystemhastwomainfunctions:

anoutputsignalacquisitionanddisplayreal-timestatusoftheprogrammablelogiccontroller（PLC）tocontroltrafficlights,trafficlights.Anothernotificationrobotstatusandhistoryofthestatereal-timecurvebyexaminingthehistoryandalarmwindow.

Thismonitoringsystemdesignandconfigurationsoftware MCGSconfigurationiseasy.Theserialcommunicationisimplementedasfollows