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1、Automationtechnologyistherapiddevelopmentofmodern,widelyused,oneofthemosteye-catchinghigh-teach,itispromotinganewtechnologicalrevolutionandanewindustrialrevolutioninthecoretechnology.Withoutautomationisusedtoreplaceequipmentorsystemshavecompletedsomeproductiontasks,orasubstituteachievecertainprocess
2、,orasubstitutefortheregulation.Strictlyspeaking,automationmeansintheabsenceofdirectparticipation,equipmentorproductionmanagementprocessthroughautomaticdetection,informationprocessing,analysisandjudgeautomaticallyachievethedesiredoperationoraprocess.AutomaticControlSystemisacertainfunctions,taskstobe
3、completedsomecontrolsystems.Automaticcontrolsystemandthecompositionofthehumanbodyandtheprincipleofthecompositionandworkofalotofsimilarities:automaticcontrolsysteminthesensoryorganofthehumansensor,equivalenttothebrainandnervoussystemcontroldevices,butalsoequivalenttothehands,legsandmusclesoftheexecut
4、ivebody.Sensorsusedtodetectcommandinformation,publicinformation,aswellaschangesinthestatusinformationoftheobject,anditstransformationintoelectricalsignaltransmissioncontroldevice.Controldeviceiscalculatedwiththecurrentstatusofobjects(knownaschargedof,orsystemsoutput)withthehopethatthestate(knownasth
5、einputsignal)poor,andinaccordancewiththisdeviation(knownastheerrorsignal)accordingtocertainlawsofthecontrolsignal,andthenamplified,gaveoperatorsimplementingagencies.Operationchargedwithimplementingagenciestodrivetargetedcampaigns,untilitreachedthedesiredstateofthestate.Thattheoutputofthesystemorsome
6、othersystemofcontrolledvariablesandtheinputforcomparison,acontrolknownasclosed-loopcontrolorfeedbackcontrolSincethe1960stheUnitedStateslaunchedprogrammablelogiccontroller(ProgrammableLogicController,PLC)toreplacetraditionalrelaycontroldevice,thePLChavedevelopedrapidly,throughouttheworldandinawideran
7、geofapplications.Atthesametime,thePLCfunctioncontinuouslyimproved.Withcomputertechnology,signalprocessingtechnology,controltechnologynetworktechnologyandthecontinuousdevelopmentofthecontinuousimprovementofuserneeds,PLCintheprocessingofswitchingonthebasisofanincreaseofanalogprocessingandmotioncontrol
8、functions.TodayisnolongerconfinedtothePLClogiccontrol,motioncontrol,processcontrol,andotherfieldshavealsoplayedaveryimportantrole.Discretecontrolofthesystemasthepreferredproduct,PLCinthe20thcentury,the1980sand1990shavedevelopedrapidly,theworldwideannualgrowthrateofPLCmaintaina20%to30%.Withfactoryaut
9、omationandthecontinuousimprovementofthecapacityPLCmarketbasecontinuestoexpand,PLCintheindustrializedcountriesinrecentyearsthegrowthhasbeenslowing.However,inChinaandotherdevelopingcountriesPLCincreasesveryrapidly.Comprehensiveinformation,in2004theglobalPLCsalesofabout10billionUSdollarsinthefieldofaut
10、omationoccupyaveryimportantposition.PLCistouchedbytheoriginalimitationrelaycontroltheorydevelopmentofthe20thCentury,the1970sonlyswitchofthePLClogiccontrol,thefirstapplicationoftheautomobilemanufacturingindustry.Withtheimplementationofstoragelogical,sequentialcontrol,timing,countingandcomputing,sucha
11、soperatinginstructions,anddigitalinputandoutputoperations,tocontrolalltypesofmachineryandproductionprocess.Usersofthecontrolproceduresoftheproductionprocesstechnologyrequirements,andadvanceintothePLCuserprogrammemory.Runningonthestorageproceduresfortheimplementationofthecontentsonebyone,tocompleteth
12、eprocessrequirementsoftheoperation.PLCCPUwiththeproceduresstepinstructionsstoredprogramcounteraddressintherunningprocess,everystepintheimplementationofanautomaticcounter,proceduresfromtheinitialstep(Stepnumberzero),followedbytheimplementationofthefinalstep(usualIyENDdirective),andthenreturnedtothein
13、itialstepcycleoperation.PLCcompletedacycleofeveryoperationknownasthetimerequiredforascancycle.DifferentmodelsofthePLC,scanningcycletocycleinamicrosecondbetweendozensofmicroseconds.PLCprogrammingbyladderdiagram,inthelogicofthebalance,theadvantagesofrapidperformance,inorderofmicroseconds,1KSolutionLog
14、icProgramminglessthan1ms.Itisalltheinputastodealwiththevolumeswitch,16(also32)forasimulatedvolume.Anotherlarge-scaleuseofPLCCPUtocompletethesimulationoftheoperation.TheresultspresentedtothePLCcontrollerThesame1/0pointssystem,withPLCthanDCS,andthecostshouldbelower(approximately40%toaboutProvince).PLC
15、donothaveadedicatedoperatorstation,whichusedthesoftwareandhardwarearegeneric,somaintenancecostismuchlowerthantheDCS.PLCcontrollercanreceivethousandsofI/0points(uptomorethan8,0001/0).Iftheaccusedwasmainlytargetedatthechainofequipment,circuitrarelyusedPLCmoresuitable.PLCasauniversalmonitoringsoftware,
16、inthedesignofthemanagementinformationsystemstoeasier.Overthepast10years,withthePLCandlowerpricesforusersdemandcontinuestoexpand,moreandmoresmallandmedium-sizedequipmentbegantousePLCcontrol,PLCapplicationinChinaisgrowingquiterapidly.WithChina'Srapideconomicdevelopmentandinfrastructureconstantlyimprovethelevelofautomation,foraperiodoftimewithinthePLCinChinawillcontinuetomaintainhigh-speedgrowthmomentum.GMPLCcanbeusedinspecializedequipmentthatitisanembeddedcontroller,PLCrelativet
