ElevatorSystemBasedonPLCAbstractWiththedevelopmentofChina'seconomy,PLCapplicationsareconstantlypopular,whiledrivingthetraditionalcontroloftheupdate,itsapplicationisextremelyextensive.Theelevatorasamodernhigh-risebuildingameansoftransport,andpeople'slivesareinseparable,withtheimprovementofpeople'slivingstandards,theelevatorrunningsafety,efficiency,comfortandotherrequirementsalsorose,makingtheelevatorgotRapiddevelopment,thecurrentwayofcontrollingtheelevatorcommonlyusedintwoways,oneiscomposedoftraditionalrelaycontrolsystem;thesecondcontrolmethodistoreplacethePLCwithprogrammablelogiccontrollercontrolsystem.ThepurposeofthisdesignistocomparetheadvantagesanddisadvantagesofthecontrolsystemcomposedofthetraditionalrelayandthecontrolsystemofthePLC.TheadvantagesofthePLCarereflected,andtheS7-200PLCisusedtocontroltheelevator,andtheprogramminglanguageisusedtorealizetheElevatorautomaticoperationofthecontrolfunction,whichgreatlyimprovethereliabilityoftheelevator.Programmablecontroller(PLC)becauseofitssimplestructure,highreliabilityandeasymaintenance,etc.,canbeverygoodforelevatorcontrol.ThroughtheuseofprogrammablecontrollerS7-200PLCcontrolfour-storyelevatorwork,intuitivedescriptionofthefour-storyelevatorPLCcontrolsystemdesignmethod.Detailsofthefour-storyelevatorthroughthePLCdesignrequirements,thespecificlistoftheinputandoutputpoints,andgivesthesystemladderdesign.Keywords:Programmablecontroldevices；S7-200；PLC；Four-storyelevatorComposedbytheorderofrelaycontrolsystemisarealizationofthefirstelevatorcontrolmethod.However,toenterthenineties,withthedevelopmentofscienceandtechnologyandthewidespreadapplicationofcomputertechnology,thesafetyofelevators,reliabilityoftheincreasinglyhighdemandontherelaycontrolweaknessesarebecomingevident.Elevatorcontrolsystemrelaysthefailureratehigh,greatlyreducesthereliabilityandsafetyofelevators,andescalatorsstoppedoftentotakewiththestaffabouttheinconvenienceandfear.Andtheeventratherthantakingtheliftorsquatattheendoftheliftwillnotonlycausedamagetomechanicalcomponents,butalsopersonalaccidentmayoccur.ProgrammableLogicController(PLC)isthefirstorderlogiccontrolinaccordancewiththeneedsofdevelopedspecificallyforindustrialenvironmentapplicationstooperatetheelectronicdigitalcomputingdevice.ThePLCbiggestcharacteristicsliein:Theelectricalengineeringteacheralreadynolongerelectrichardwareuptoomanycalculationsofcost,aslongasordertheimportationthatthebuttonswitchortheimportationofthesensorsordertolinkthePLCupcansolveproblem,passtooutputtoordertheconjunctioncontactmachineorcontrolthestartequipmentsofthebigpoweraftertheelectricappliances,buttheexportationequipmentsdirectconjunctionofthesmallpowercan.PLCinternalcontainmenthavetheCPUoftheCPU,andtaketohaveanI/Oforexpandofexteriortoconnectapeople'saddressandsavingmachinethreebigpiecestoconstitute,CPUcoreisfromanormanyistiredtoaddthemachinetoconstitute,mathematicsthattheyhavethelogicoperationability,andcanreadtheproceduresavethecontentsofthemachinetodrivethehomologoussavingmachineandI/Ostoconnectafterpassthecalculation;TheI/Oaddinnerpartistiredtheinputandoutputsystemofthemachineandexteriorlink,anddeposittherelateddataintotheproceduresavingmachineordatasavingmachine;ThesavingmachinecandepositthedatathattheI/Oinputinthesavingmachine,andinworkadjustingtobecometiredtoaddthemachineandI/Otoconnect,savingmachineseparatelysavingmachineRAMoft...
