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1、附件3：外文文献原文PLCApplicationintheControlofCIAE-30Cyclotron此文选自：PLC&FA作者：LiZhenguo1OverviewAPLCconsistsofaCentralProcessingUnit(CPU)containinganapplicationprogramandInputandOutputInterfacemodules,whichisdirectlyconnectedtothefieldI/Odevices.TheprogramcontrolsthePLCsothatwhenaninputsignalfrom
2、aninputdeviceturnsON,theappropriateresponseismade.TheresponsenormallyinvolvesturningONanoutputsignaltosomesortofoutputdevices.Inanautomatedsystem,thePLCiscommonlyregardedastheheartofthecontrolsystem.Withacontrolapplicationprogram(storedwithinthePLCmemory)Inexecution,thePLCconstantlymoni
3、torsthestateofthesystemthroughthefieldinputdevices’feedbacksignal.Itwillthenbasedontheprogramlogictodeterminethecourseofactiontobecarriedoutatthefieldoutputdevices.ThePLCmaybeusedtocontrolasimpleandrepetitivetask,orafewofthemmaybeinterconnectedtogetherwithotherhostcontrollersorhostcompu
4、terthroughasortofcommunicationnetwork,inordertointegratethecontrolofacomplexprocess.Ingeneral,aControlSystemisacollectionofelectronicdevicesandequipmentwhichareinplacetoensurethestability,accuracyandsmoothtransitionofaprocessoramanufacturingactivity.Ittakesanyformandvariesinscaleofimple
5、mentation,fromapowerplanttoasemi-conductormachine.Asaresultofrapidadvancementoftechnology,complicatedcontroltasksaccomplishedwithahighlyautomatedcontrolsystem,whichmaybeinthefielddevices（suchasoperatorpanel,motors,sensors,switches,solenoidvalvesandetc.）,capabilitiesinnetworkcommunicatio
6、nenableabigscaleimplementationandprocessco-ordinationbesidesprovidinggreaterflexibilityinrealizingdistributedcontrolsystem.Everysinglecomponentinacontrolsystemplaysanimportantroleregardlessofsize.AtypicalPLCcontrolsystemconsistsofthehardware,softwareandnetworkcomponents,togetherwiththec
7、ontrolledfunctionsandassociateddocumentation.ThePLChardwarecanincludearack,powersupply,CPU,networkinterfacecard,digitaloranalogI/Ocards,andotherspecialpurposecardssuchashigh-speedcounter,motioncontrol,pulseinputandothers.ThesoftwareportionofaPLCcontrolsysteminvolvesfirmware–whi
