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1、摘要摘要随着微机技术的应用和固体功率器件的发展和完善，电梯控制技术已由20世纪前半叶的直流调速发展成为交流变频调速的当代技术。载货电梯作为电梯的一种，在我国，通过引进国际标准和发达国家先进产品和技术，不断发展和完善起来。可编程控制器（PLC）作为一种工业控制微型计算机，它以其编程方便、操作简单尤其是它的高可控性等优点，在工业生产过程中得到了广泛的应用。它应用大规模集成电路，微型机技术和通讯技术的发展成果，逐步形成了具有很多种优点和系列产品，应用于从继电器控制系统到监控计算机之间的许多控制领域。通过此次毕业设计，成功完成七层电梯的PLC控制及梯形图的认识。同时使用计算机与PLC的通
2、讯，实现了对电梯运行状况的监视，也可实现通过计算机对电梯的间接运行控制。由此可以说明，用PLC实现楼宇间电梯的自动控制以及电梯、电梯群的远程、集中监控的安全可靠性和可行性。关键词：可编程序控制器,电梯控制,梯形图,安全可靠性II摘要AbstractInthewakeofutilizationincomputertechnologyandthedevelopmentandimprovementofsolidpowerdevice,elevatorcontrollingtechnologyhasbecomemoderntechnologysincethefirsthalfofthe2
3、0thcentury,whichisconstantcurrentspeedregulationtoalternatingcurrentvaryingfrequencyspeedregulation.Asintroducinginternationalstandardandadvancedproductsandtechnologiesfromdevelopedcountries,freightelevatorsasakindofelevatorshavebeendevelopedandimprovedinourcountry.ProgrammableLogicController
4、(PLC)takesoneindustrialcontrolmicrocomputer,itisconvenientbyitsprogramming,simplicityofoperatoritsmeritsandsoonhighcontrollability,obtainedthewidespreadapplicationparticularlyintheindustrialproductionprocess.Itappliesthelargescaleintegratedcircuit,theminiaturemachinetechnologyandthemechanicso
5、fcommunicationdevelopmentachievement,formedgraduallyhadmanykindsofmeritsandsooneachkindofspecification'sserialproducts,appliedtomonitorsbetweencomputer'smanycontroldomainfromtheblack-whitecontrolsystem.Alongwithsociety'sunceasingdevelopment,thebuildingisgettinghigherandhigher,buttheelevatorbe
6、camethehigh-levelbuildingtotheequipment.Inthisdesign,seven-storefreightelevatorscanbeappliedbyPLCcontrollingandactivatedwithvariablefrequency.Also,thecomputercommunicationsucceedstooperateonthesurveillanceofthefreightelevatorandcompletestherunningcontrolledindirectlyonthecomputer.Therefore,it
7、issupposedthatitisfeasibletousePLCtocontrolfreightelevatorsandfocusonmonitoringthembetweenbuildingsKeyWords:ProgrammableLogicController,Liftcontrol,FrequencyTransformer，PLCCommunication，MonitoringFunctionII目录目录摘要IAbstractII1引言11.1课题背景11.2课题的要
