自动化技术-------英文翻译.docx

Automationtechnologyistherapiddevelopmentofmodern,widelyused,oneofthemosteye-catchinghigh-teach,itispromotinganewtechnologicalrevolutionandanewindustrialrevolutioninthecoretechnology.Withoutautomationisusedtoreplaceequipmentorsystemshavecompletedsomeproductiontasks,orasubstituteachievecertainprocess,orasubstitutefortheregulation.Strictlyspeaking,automationmeansintheabsenceofdirectparticipation,equipmentorproductionmanagementprocessthroughautomaticdetection,informationprocessing,analysisandjudgeautomaticallyachievethedesiredoperationoraprocess.AutomaticControlSystemisacertainfunctions,taskstobecompletedsomecontrolsystems.Automaticcontrolsystemandthecompositionofthehumanbodyandtheprincipleofthecompositionandworkofalotofsimilarities:automaticcontrolsysteminthesensoryorganofthehumansensor,equivalenttothebrainandnervoussystemcontroldevices,butalsoequivalenttothehands,legsandmusclesoftheexecutivebody.Sensorsusedtodetectcommandinformation,publicinformation,aswellaschangesinthestatusinformationoftheobject,anditstransformationintoelectricalsignaltransmissioncontroldevice.Controldeviceiscalculatedwiththecurrentstatusofobjects(knownaschargedof,orsystemsoutput)withthehopethatthestate(knownastheinputsignal)poor,andinaccordancewiththisdeviation(knownastheerrorsignal)accordingtocertainlawsofthecontrolsignal,andthenamplified,gaveoperatorsimplementingagencies.Operationchargedwithimplementingagenciestodrivetargetedcampaigns,untilitreachedthedesiredstateofthestate.Thattheoutputofthesystemorsomeothersystemofcontrolledvariablesandtheinputforcomparison,acontrolknownasclosed-loopcontrolorfeedbackcontrolSincethe1960stheUnitedStateslaunchedprogrammablelogiccontroller(ProgrammableLogicController,PLC)toreplacetraditionalrelaycontroldevice,thePLChavedevelopedrapidly,throughouttheworldandinawiderangeofapplications.Atthesametime,thePLCfunctioncontinuouslyimproved.Withcomputertechnology,signalprocessingtechnology,controltechnologynetworktechnologyandthecontinuousdevelopmentofthecontinuousimprovementofuserneeds,PLCintheprocessingofswitchingonthebasisofanincreaseofanalogprocessingandmotioncontrolfunctions.TodayisnolongerconfinedtothePLClogiccontrol,motioncontrol,processcontrol,andotherfieldshavealsoplayedaveryimportantrole.Discretecontrolofthesystemasthepreferredproduct,PLCinthe20thcentury,the1980sand1990shavedevelopedrapidly,theworldwideannualgrowthrateofPLCmaintaina20%to30%.WithfactoryautomationandthecontinuousimprovementofthecapacityPLCmarketbasecontinuestoexpand,PLCintheindustrializedcountriesinrecentyearsthegrowthhasbeenslowing.However,inChinaandotherdevelopingcountriesPLCincreasesveryrapidly.Comprehensiveinformation,in2004theglobalPLCsalesofabout10billionUSdollarsinthefieldofautomationoccupyaveryimportantposition.PLCistouchedbytheoriginalimitationrelaycontroltheorydevelopmentofthe20thCentury,the1970sonlyswitchofthePLClogiccontrol,thefirstapplicationoftheautomobilemanufacturingindustry.Withtheimplementationofstoragelogical,sequentialcontrol,timing,countingandcomputing,suchasoperatinginstructions,anddigitalinputandoutputoperations,tocontrolalltypesofmachineryandproductionprocess.Usersofthecontrolproceduresoftheproductionprocesstechnologyrequirements,andadvanceintothePLCuserprogrammemory.Runningonthestorageproceduresfortheimplementationofthecontentsonebyone,tocompletetheprocessrequirementsoftheoperation.PLCCPUwiththeproceduresstepinstructionsstoredprogramcounteraddressintherunningprocess,everystepintheimplementationofanautomaticcounter,proceduresfromtheinitialstep(Stepnumberzero),followedbytheimplementationofthefinalstep(usualIyENDdirective),andthenreturnedtotheinitialstepcycleoperation.PLCcompletedacycleofeveryoperationknownasthetimerequiredforascancycle.DifferentmodelsofthePLC,scanningcycletocycleinamicrosecondbetweendozensofmicroseconds.PLCprogrammingbyladderdiagram,inthelogicofthebalance,theadvantagesofrapidperformance,inorderofmicroseconds,1KSolutionLogicProgramminglessthan1ms.Itisalltheinputastodealwiththevolumeswitch,16(also32)forasimulatedvolume.Anotherlarge-scaleuseofPLCCPUtocompletethesimulationoftheoperation.TheresultspresentedtothePLCcontrollerThesame1/0pointssystem,withPLCthanDCS,andthecostshouldbelower(approximately40%toaboutProvince).PLCdonothaveadedicatedoperatorstation,whichusedthesoftwareandhardwarearegeneric,somaintenancecostismuchlowerthantheDCS.PLCcontrollercanreceivethousandsofI/0points(uptomorethan8,0001/0).Iftheaccusedwasmainlytargetedatthechainofequipment,circuitrarelyusedPLCmoresuitable.PLCasauniversalmonitoringsoftware,inthedesignofthemanagementinformationsystemstoeasier.Overthepast10years,withthePLCandlowerpricesforusersdemandcontinuestoexpand,moreandmoresmallandmedium-sizedequipmentbegantousePLCcontrol,PLCapplicationinChinaisgrowingquiterapidly.WithChina'Srapideconomicdevelopmentandinfrastructureconstantlyimprovethelevelofautomation,foraperiodoftimewithinthePLCinChinawillcontinuetomaintainhigh-speedgrowthmomentum.GMPLCcanbeusedinspecializedequipmentthatitisanembeddedcontroller,PLCrelativet