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Classificationofcontrolsystemstherearethreeways:byautomaticclassificationmethodsinordertoparticipateinthecontrolmodeclassification,toadjustthelawcategory.Onewaytocontrolcategory1,theopen-loopcontrolsystemifthecomputeroutputofopenloopcontrolsystemtoexercisecontroloftheproductionprocess,butthecontrolresults---thestateoftheproductionprocessdoesnotaffectthecomputercontrolsystems,computer\controller\productionandothersectorsdoesnotconstituteaclosedloop,iscalledopen-loopcontrolsystemcomputer.theproductionprocessofthestateisnofeedbacktothecomputer,butbytheoperatortomonitorthestatusoftheproductionprocess,decisioncontrolprogram,andtellthecomputertocontroltheroleofexercisingcontrol.2,closedloopcontrolsystemcomputertotheproductionofanobjectorprocesscontrol,thestatecandirectlyinfluencetheproductionprocesscomputercontrolsystem,calledtheclosed-loopcontrolsystemcomputer.Controlofthecomputermonitorintheoperator,theautomaticacceptanceoftheproductionprocessstatetestresults,calculateanddeterminethecontrolscheme,thedirectcommandandcontrolunits(devices)ofaction,theroleofexercisingcontroloftheproductionprocess.Insuchsystems,aircraftcontrolcomponentsundercontrolofcontrolinformationsenttocontroldeviceoperation,theotherrunningequipmentconditionastheoutput,measuredbythedetectionpart,thefeedbackasinputtothecontrolcomputer;tomakecontrolComputer\ControlComponents\production\testcomponentsformaclosedloop.Wewillcallthisformofcontrolcomputercontrolclosed-loopcontrol.Closedloopcontrolsystemcomputer,usingamathematicalmodeltosetthevalueoftheproductionprocessandtestresultsofthebestvalueofthedeviationbetweenthefeedbackandcontroltheproductionprocesstorunattheirbest.3,linecontrolsystemaslongasthecomputercontrolledproductionofthecontrolledobjectorprocess,toexercisedirectcontrol,withouthumaninterventionarecalledthecontrolcomputeron-linecontrol,oron-linecontrolsystem.4,offlinecontrolsystemcontrolcomputerdoesnotdirectlyparticipateinthecontrolobjectorthecontrolledproductionprocess.Itonlymanagedtocompletetheprocessofthecontrolledobjectorthestatusoftesting,andtestingofdataprocessing;andthendevelopcontrolprograms,theoutputcontrolinstruction,operatorreferencecontrolinstructionsmanuallycontrolledoperationtocontrolpartsoftheobjectorsubjectcontrolprocesscontrol.Thiscontrolformiscalledoff-linecomputercontrolsystem.5,real-timecontrolsystemcontrolcomputerreal-timecontrolsystemiscontrolledbythecontroloftheobjectorprocess,orrequestwhentherequestprocessingcontrol,thecontrolfunctioninatimelymannertoaddressandcontrolsystems,commonlyusedintheproductionprocessisinterruptedfortheoccasion.Suchassteel,eachonerefiningfurnacesteelisaprocess;andiftheprocessrolling,rollingouteachpieceofsteelconsideredaprocess,eachprocessisrepeated.Onlyentertheprocessonlyrequiresacomputercontrol.Oncecontrolofthecomputer,itrequiresacomputerfromtheproductionprocessinformationintherequiredtimetorespondtoorcontrol.Suchsystemsoftenusesophisticatedinterruptsystemandinterrupthandlingprocedurestoachieve.Insummary,anonlinesystemisnotnecessarilyareal-timesystem.Butareal-timesystemmustbeanonlinesystem.Second,inordertoparticipateinthecontrolmodetoCategory1,directdigitalcontrolsystembythecontrolcomputertoreplaceconventionalanaloginstrumentsanddirectregulationtocontroltheproductionprocess,asthecomputerasdigitalsignals,sonamedaftertheDDCcontrol.Actuallycontrolledtheproductionprocesscontrolcomponents,controlsignalsreceivedbytheprocesscontrollerinput/outputchannelsofD/(D/A)converteroutputofthedigitalcontrolcomputervolumetobeconvertedintoanalog;analoginputcontrolmachinetogothroughtheprocessofinput/outputchannelsofanalog/digital(A/D)converterintoadigitalnumberintothecomputer.DDCcontrolsystemsoftenuseasmallcomputerormicroprocessor,thetime-sharingsystemtoachievemultiplepointsofcontrol.Isinfactadiscretesamplingwiththecontroller,toachievediscretemulti-pointcontrol.DDCcomputercontrolsystemthathasbecomethemaincontrolcomputercontrolsystemforms.DDCcontroloftheadvantageofflexibility,large,focusedonhighreliabilityandlowcost.Canuseseveralformsofdigitalcomputingcircuits,orevendozensofloopproductionprocess,integraltoproportional------differential(PID)controltomaintaintheindustrialstateofthecontrolledobjectatagivenvalue,thedeviationsmallandstable.Andaslongasthechangeofcontrolalgorithmsandapplicationscanachievemorecomplexcontrol.Suchasfeedforwardcontrolandthebestcontrol.Undernormalcircumstances,DDC-levelcontroloftenmorecomplexastheimplementationofadvancedcontrollevel.2,supervisorycomputercontrolsystemsupervisorycomputercontrolsystemforaparticularproductionprocess,accordingtotheproductionprocessofvariousstates,accordingtotheproductionprocessofthemathematicalmodeltocalculatethebestproductionequipmentshouldberunningagivenvalue,andthebestvalueautomaticallyormanuallyontheDDCExecutive-levelcomputeroranalogmetertoaligntheregulationorcontrolofthetargetset.ByaDDCoradjusttheinstrumentatvariouspointsontheproductionprocess(runningequipment)toexercisecontrol.SCCsystemisthatitcanguaranteetheproductionprocessisalwayscontrolledthesituationi