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1、ThedevelopmentandapplicationofPLCAbstract:ThefullnameofPLCisprogrammablecontroller.itisdefinedasadigitalcomputingoperationsoftheelectronicsystem,specificallydesignedforapplicationinindustrialenvironments.It'smainstructurebypowersupply,thecentralprocessingunit,memory，inputandoutputint
2、erfacecircuit,functionmodules,andcommunicationmodules.becauseofPLChasstrongcommonality,useconvenient,wideadaptability,easytoprogrammandothercharacteristics,it，susedwidelyinthemilitary,thenationaldefense,aerospace,transportationandindustrialproduction・Thereforeitcannotbereplacedinthef
3、oreseeablefuture・Asweknow,PLChasmanyschools,PLCdevelopinginChinaisveryquickly,especiallyintheapplication・Keyword:Developmentprocess,controlfunction,application,trendSummary:TheProgrammableLogicController(PLC),itusesaProgrammablememoryforitsinternalstorageprocedures,toperformtheLogico
4、peration,sequencecontrol,timing,countingandarithmeticoperationoandthroughthedigitaloranaloginput/outputtocontrolvarioustypesofmachineryorproductionprocessintheindustrialautomationcontrolfield.PLChastheimportantpositionintheindustryandhasanirreplaceableroleinthefuture・Fromnowon,thewor
5、ldsbestPLCproductionismainlycontainedGermany'sSiemens,Japan'sMitsubishi,HoneywellcompanyinUSA,PLCisdividedintowholetypeandmoduletypeaccordingtothestructure・accordingtotheapplicationenvironmentintoon-siteinstallationandcontrolroominstallation;what'smore,aCPUwordlengthcanbedividedinto4
6、,&16,32,64bites.Fromtheapplicationpointofviewjtusuallycanbechooseincontrolledfunctionorinputandoutputpoints.Inthisrespect,PLCcontrolfunctionsalsousedinmanyindustrialfields,anditsfuturedevelopmentiscloselyrelatedtotheindustrialdevelopment・PLCthedevelopmenthistoryandmainschoolsIntheind
7、ustrialproductionprocess,alargenumberofswitchordercontrol,orderofactioninaccordaneewithlogicalconditions,andcontrollingthemotionofchainprotection,andalargenumberofdiscretedataacquisitioninaccordancewiththelogicalrelationship.Traditionally,thesefunctionsareachievedbypneumaticorelectri
8、calcontrolsy
