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1、十字路口红绿灯设计(Intersectiontrafficlightdesign)AbstractWiththeaccelerationofthepaceofenteringthefamilyandtheincreaseofthenumberofurbancars,urbanroadtrafficproblemsarebecomingmoreandmoreimportant・Tosolvetheproblemoftrafficsignalcontrolisanimportantlinktoensu
2、rethetrafficorder,safetyandquickoperation.Butthetrafficlightsatthecrossroadsoftheexistingcontrolsystemmostlyadoptsrelaysormicrocomputer,andaretheinherentsequentialsinglecontrol,cannotbeadjustedaccordingtotheactualsituationoftheroadtrafficcontrol,there
3、aredisadvantagesoflessfunction,poorreliability,highmaintenanceetc・・Inordertomakeupfortheshortcomingsoftheoriginaltrafficsignalsystem,thispaperdesignedatrafficsignalcontrolsystembasedonPLCcontro1.ThissystemadoptstheprogrammablelogiccontrolleristheGerma
4、ncompanySIEMENSS7-200,hasacertaindegreeofintelligence,whichcanbecontrolledaccordingtothetrafficlightsatthecrossroadsoftheroadtraffic,accordingtothesizeofthepeakperiodandnormaleveningseveralperiodswhen.Keywords:intersectiontrafficlightscontrolsystempro
5、grammablelogiccontroller(PLC)time-sharingcontrolCatalogdesignbackgroundOnebackgroundoverviewOneintroductiontoprogrammablelogiccontrollerOneIntroductionofPLCcontrolsystemoftrafficsignallightatintersectionTwocontrolobjectsandrequirements・・・・Two2.1.1cont
6、rolobjectTwo2.1.2controlrequirementsTwo2.2systemprofilesFour2.3hardwareselectionFivesystemI/OallocationSixWiringdiagramof4PLCterminalSevensoftwaredesignEight6summaryFifteenAppendixsource-STLstatementSixteenReferencesTwenty-three1designbackground1.1bac
7、kgroundoverviewWiththeaccelerationofthepaceofenteringthefamilyandtheincreaseofthenumberofurbancars,urbanroadtrafficproblemsarebecomingmoreandmoreimportant・Theroadwilloftenseethisphenomenon:oncetheintersectiontrafficsignallampfailure,ifthereisnotraffic
8、policetimely,theintersectionwillfillinacompletemess,andevencauseserioustrafficaccident・Theoriginaltrafficsignalcontrolismostlyrealizedbyrelayorsinglechipmicrocomputer・Ithasmanydisadvantages,suchaslessfunction,badreliabilityandlargemaintenance・
