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科技论文题目Theprogrammablelogiccontroller(PLC)appliedinelectriccontrol系别电子工程学院专业应用电子技术班级1201学生姓名史雨晴学号120002指导教师卓陈祥2015年3月无锡科技职业学院科技论文Theprogrammablelogiccontroller(PLC)appliedinelectriccontrol2Theprogrammablelogiccontroller(PLC)appliedinelectriccontrolWiththerapiddevelopmentofcomputertechnology,microelectronicstechnologyanddigitalcommunicationtechnology,theprogrammablecontroller(PLC)productswiththemostadvancedtechnicalmeansofcomputerindustryandanimportanttheoryofelectricalautomationandcontrol,theperformanceindexandworktofurtherimproveandenrich,breakingthetraditionalconceptofPLC,inthedevelopmentofelectricalcontrolfieldmoreandmorebig.Programmablecontroller(PLC)ismainlybasedonthecomputer'smicroprocessor,thecomprehensiveapplicationofcomputertechnology,communicationtechnologyandautomaticcontroltechnologyanddevelopedakindofgeneralcontroller.AlthoughPLCiscomposedofcomplexmicroprocessors,butintheprocessofpracticalapplication,completelydon'tneedtounderstandtheinternalstructureofthemicroprocessor.Initially,thePLCisonlyasasubstituteforrelaycontactcontrolsystem,andsinceintotheelectriccontrolsystemdomain,highlightsitsuniquesuperiority,withitsownpowerfulanti-interferenceabilityandself-diagnosisfunction,improvethereliabilityofelectriccontrolsystem,basicallysolvedthecommonfaultsinthegeneralrelayandcontact,afterdebuggingcanrunsafelyandreliablyforalongtime.Thisarticle,thecharacteristicsandbasicworkingprocessofPLCanditsapplicationinelectriccontrolproblemsareanalyzedandexpounded1.What'sthePLCPLCprogrammingcontroller(ProgrammablelogicController,referstocomputertechnologyasthefoundationofnewindustrialcontroldevice.In1987bytheinternationalelectronictechnicalcommission(InternationalElectricalCommittee)ofthePLCinthedraftstandardforPLCdefinitionisasfollows:PLCEnglishfullnameProgrammableLogicController,isprogrammablelogiccontroller,isdefinedasakindofdigitalcomputingoperationselectronicsystem,designedspecificallyforapplicationinindustrialenvironment.ItUSESaprogrammablememory,usedforitsinternalstorageprocedures,toperformthelogicoperation,sequencecontrol,timing,无锡科技职业学院科技论文Theprogrammablelogiccontroller(PLC)appliedinelectriccontrol3countingandarithmeticoperationssuchasuser-orientedinstructions,andthroughthedigitaloranaloginput/outputcontrolvarioustypesofmachineryorproductionprocess.PLCisaprogrammablelogiccircuit,isalanguagethatiscombinedwithhardwareisveryclose,hasveryimportantapplicationinsemiconductor,cansaythatthereisaneedofsemiconductorPLCPLCisaspeciallydesignedforapplicationinindustrialenvironmentanddigitalcomputingoperationofelectronicdevices.Itcanadoptprogrammemory,usedinitsinternalstoragetoperformlogicoperation,orderoperation,timing,countingandarithmeticoperationssuchasinstruction,andcanthroughdigitaloranaloginputandoutput,controlvarioustypesofmachineryorproductionprocess.PLCandrelatedperipheralequipmentshouldpresseasilyandindustrialcontrolsystemtoformawhole,easytoextenditsfunctionandtheprincipleofdesign.2.ThehistoryofthePLCProgrammablecontrollerwasin1969.Thelate60s,whenAmerica'sautomobilemanufacturingindustryisverydeveloped,isalsoverycompetitive.Themanufacturersinordertoadapttomarketdemandconstantlyupdatedmodels,whichinevitablyrequiresthecorrespondingprocessingproductionAlsochangetheline,therelaycontactcontrolsystemalsomustberedesignedandconfiguration.Suchnotonlycausedthewaste,andwiringofthenewsystemisalsoverytimeconsuming.Inthiscase,isstillcontrolledbyrelaythereistoomuch.Itisfromautomobilemanufacturingindustrybeganachallengetothetraditionalrelaycontrol.GeneralMotorscompaniesintheUnitedStatesin1968,inordertoadapttothecontinuousrenewalofproducts,reducethecostofthechangecontrolsystemwithcycles,askmanufacturerfortheassemblylinetoprovideanewkindofgeneralprogramcontroller,andputsforwardtenmeasuresofbidding:1)Programmingissimple,canmodifytheprogramatthescene;2)Maintenanceconvenient,hadbetterbeplug-in;3)Reliabilityhigherthanthatofrelaycontrolcabinet;4)Volumesmallerthanthatofrelaycontrolcabinet;无锡科技职业学院科技论文Theprogrammablelogiccontroller(PLC)appliedinelectriccontrol45)Datacanbedirectlyintothemanagementcomputer;6)Oncoststocompetewithrelaycontrolcabinet;7)Inputcanbeac115v.8)Outputforac115v,2a)above,candirectdrivesolenoidvalve,etc.;9)Intheextension,theoriginalsystemonlyneedasmallchanges;Atleast10)userprogrammemorycapacitycouldextendto4k.ThisisthefamousGM10.Ifallkindsofelectriccontroller,thedevelopmentofelectroniccomputertechnologyisthematerialbasisofprogrammablecontrollerintheGM10isthedirectcauseofprogrammablecontrollerappears.In1969,theUnitedStatesdataequipmentcorporation(DEC)developedtheworld'sfirstprogrammablecontroller,andsuccessfullyappliedintheGMofthecompany'sproductionline.FollowedbyJapan,westGermany,havebeenintroduced,makeitsrapiddevelopment.Butthistimeitismainlyusedinsequencecontrol,althoughalsoUSESthecomputerdesignidea,butonlylogicaloperationsatthetime,socalledprogrammablelogiccontroller,hereinafterreferredtoas：PLC(ProgrammableLogicController)。Intheearly70softhebirthofmicroprocessorandmicrocomputer,throughconstantdevelopmentandimprovem