DCS中英文翻译毕业论文控制系统.docx

DCS中英文翻译毕业论文控制系统.docx

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DCS中英文翻译毕业论文控制系统

英文翻译

DCS

DCSDistributedControlSystemistheabbreviationof（DistributedControlSystem）,automationindustryinthecountryisalsoknownasdistributedcontrolsystem.Theso-calleddistributedcontrolsystem,orinsomeoftheinformationinthecalldistributionsystem,asopposedtocentralizedcontrolsystems,anewcomputercontrolsystem,whichisacentralizedcontrolsystembasedonthedevelopment,evolutionandcome.Itisaprocessbytheprocesscontrollevelandthecompositionofmonitoringlevelcommunicationsnetworkasalinktothemulti-levelcomputersystems,integratedcomputer,communication,displayandcontroltechnologiessuchas4C,thebasicideaisdecentralizedcontrol,centralizedoperations,hierarchicalmanagement,flexibleconfiguration,andconfigurationeasy.Functioninthesystem,DCS,andcentralizedcontrolsystemsarenotverydifferent,butintherealizationofsystemfunctionsmethodsarecompletelydifferent.

First,DCS'sskeleton-thesystemnetwork,whichisthefoundationandcoreDCS.Asthenetworkofthesystemforreal-timeDCS,reliabilityandscalability,playadecisiverole,sothemanufacturershavebeencarefulinthisareaofdesign.FortheDCSsystemnetwork,itmustmeettherequirementsofreal-time,thatiscompletedwithindefinedtimelimitstransmissionofinformation.Heretheword"determine"thetimelimitisinanycase,theinformationtransfercanbecompletedwithinthistimelimit,andthistimelimitisbasedonreal-timecontrolledprocessrequirementsidentified.Therefore,indicatorsofnetworkperformancemeasurementsystemisnotthenetwork'srate,knownasbitspersecond（bps）,butthereal-timesystemnetwork,whichcanensurethelongperiodoftimetocompletetherequiredinformationtransmission.Systemnetworkalsomustbeveryreliableinanycase,networkcommunicationsarenotinterrupted,somostmanufacturersofDCSweredoublebus,ringordualstarnetworktopology.Scalabilitytomeettherequirementsofthesystem,thesystemcanaccessthenetworkshouldbehigherthanthemaximumnumberofnodesinthelargenumberofnodesactuallyusedseveraltimes.Inthisway,onecanalwaysaddanewnode,itcanalsomakethesystemruninalighternetworktrafficloadconditions,toensurethatthesystemreal-timeandreliability.Duringtheactualoperationofthesystem,eachnodeoftheInternetandthenetmayoccuratanytime,inparticular,operatorstations,sothatreconfigurationwillalwaysbe,andthisoperationmustnotaffectthenormaloperation,therefore,thesystemnetworkshouldhaveastrongonlinenetworkreconfigurationfunctions.

Secondly,thisisacompletelyon-siteI/Oprocessingandrealizationofdirectdigitalcontrol（DDC）featureofnetworknodes.TosetthegeneralsceneinaDCSI/Ocontrollers,tosharetheentiresystemI/Oandcontrolfunctions.Thissitecanbeavoidedduetoafailurecausedbythefailureoftheentiresystem,improvesystemreliability,thesitealsoallowssharingofdataacquisitionandcontrolfunctions,willhelpimproveoverallsystemperformance.DCSoperatorstationisrunoperationtodealwithallthehuman-machineinterface（HMI-HumanMachineInterface,oroperatorinterface）functionofnetworknodes.

DCSengineerstationisoff-lineconfiguration,thesystemconfigurationwork,andonlinemonitoring,control,maintenanceofthenetworknode,anditsmainfunctionistoprovidetotheDCSconfiguration,softwareconfigurationtool（ie,theconfigurationsoftware）andrunningonlineinrealtimeDCSDCSnetworktomonitortheoperationofeachnode,thesystemengineercanengineerstationtoadjustthesystemconfigurationsettingsandsomesystemparameters,theDCSatanytimeunderthebestworkingcondition.Andcentralizedcontrolsystems,arerequiredtohavealloftheDCSsystemconfigurationfunctions,itcanbesaid,nosystemconfigurationfunctionsofthesystemcannotbecalledasaDCS.

DCSsinceitsinceptionin1975,hasalreadyexperiencedtwentyyearsofdevelopment.Intwodecades,DCSsystemarchitecturealthoughthereisnosignificantchange,butthroughconstantdevelopmentandimprovementofitsfunctionalityandperformancehavebeenahugeincrease.Ingeneral,DCSistowardmoreopen,morestandardizedproductinthedirectionofdevelopment.

Asthefieldofprocessautomationcomputercontrolsystem,thetraditionalDCSisonlyanarrowconcept.IfonlytheproductionprocessthatDCSautomationsystem,whichwillleadtowrongconclusions,becausethemeaningofthecomputercontrolsystemhasbeengreatlyexpanded,anditincludesnotonlytheDCSinthepastincludedavarietyofcontent,butalsodrilldowntotheeachsitemeasuringequipment,implementingagencies,upwardstotheproductionmanagement,allaspectsofbusiness.TraditionalDCSnowonlyreferstothispartoftheproductionprocesscontrolautomation,andindustrialautomationsystemconcept,shouldbetargetedtoenterprise-widesolution,totalsolutionlevel.Onlyfromthisperspectivetoaskquestionsandsolveproblems,toreallyplaythecomputerautomationofitsrole.DCShasthefollowingcharacteristics:

（1）highreliability.DCSsystemtocontrolthespreadofthecomputerimplementation,thesystemusesfault-tolerantdesignofthestructure,soacomputersystemmalfunctionwillnotcausethelossofotherfunctions.Inaddition,eachcomputersystem,thetasksundertakenbyrelativelysimplefunctionscanbeusedfortheneedtoachieveaspecificstructureandspecialcomputersoftware,sothatthereliabilityofeachcomputersystemhasalsobeenimproved.

（2）open.DCSanopen,standardized,modularandserialdesign,thesystemmeanseachcomputerusingtheLANcommunication,toachieveinformationtransmission,whentheneedtochangeorexpandthesystemfunctionalitycanbeaddedeasilyconnectedtoacomputersystemcommunicationnetworkorRemovefromthenetwork,almostdoesnotaffecttheworkofothercomputersystems.

HistoryofdevelopmentofDCS

DCSDistributedControlSystemistheabbreviationof（DistributedControlSystem）,automationindustryinthecountryisalsoknownasdistributedcontrolsystem.Itisaprocessbytheprocesscontrollevelandthecompositionofmonitoringlevelcommunicationsnetworkasalinktothemulti-levelcomputersystems,integratedcomputer（Computer）,communication（Communication）,display（CRT）andcontrol（Control）andother4Ctechnology,Thebasicideaisdecentralizedcontrol,centralizedoperations,hierarchicalmanagement,flexibleconfiguration,easyconfiguration.）Itsdevelopmentcanbedividedintothreestages.

Stage:

1975-1980,duringthisperiodthetechnicalcharacteristicsofdistributedcontrolsystemasfollows:

1）usingmicroprocessor-basedcontrolunit,toachievedecentralizedcontrol,awidevarietyofalgorithms,throughtheloopcontrolconfigurationindependently,withself-diagnosticfunction

2）TheoperatingstationwithaCRTdisplayunitandtheprocessofseparation,centralizedmonitoring,centralizedoperation

3）amoreadvancedcommunicationsystemredundancy

Thesecondphase:

1980-1985.,Distributedcontrolsystemduringthisperiodthetechnicalfeaturesasfollows:

1）increasethenumberofbitsmicroprocessors,CRTdisplayresolutiontoimprove

2）strengtheningthemodularsystem

3）strengthenthesystemofinformationmanagement,strengtheningcommunicationThethirdphase,after1985,thethirdgenerationofdistributedsystems,anditstechnicalcharacteristicswereasfollows:

1）Theadoptionofopensystemsmanagement

2）32-bitmicroprocessoroperatingstation

3）usingreal-timemulti-usermulti-taskingoperatingsystem

Intothenextdecade,computertechnologyadvances,morenewtechnologyisbeingappliedtotheDCS.PLCisasequentiallogiccontroldevelopedforelectronicequipment,whichisusedinsteadofinflexibleandcumbersomerelaylogic.FieldbusTechnologyinenteringdevelopedveryrapidlysincethemidninetiesthatsomepeoplehavetopredict:

FCSbasedonfieldbuscontrolsystemwillreplacetheDCSastheprotagonist.

DCSisaDataCommunicationSubsystem（datacommunicationssubsystems）forshort.

Torailtransportationindustry,forexample,DCSisapurenon-transparentsecuritysystem,heissentbetweenthecontrolcenterandtraincarrierpacket.

DCSsecondlayerofmeaning:

DorsalColumnStimulator[medical]spinestimulator

Inthespecialcontrolareas,suchasnuclearpowerplantcontrolsystem,DCSisthemeaningofdigitalcontrolsystem（Digitalcontrolsystem）.

DCSmaindomesticmanufacturersare:

ShanghaiXinhua,thesupercontrol,StatePowerZhishen,ZhejiangUniversityincontrol,andBelgium,ShanghaiChinese,ShanghaiLeroy,fromZhejiangandsoon.ThereWestinghouseabroad（Emerson）,FOXBORO,ABB,Siemens,Honeywell,Yokogawa,Yamatake-Honeywell,FISHER-ROSEMOUNTcompanies

OverviewofcharacteristicsanddevelopmentofDCS

DCSisadistributedcontrolsystem（DistributedControlSystem）forshort,iscommonlycalledthedomesticgeneraldistributedcontrolsystem.Itisaprocessbytheprocesscontrollevelandthecompositionofmonitoringlevelcommunicationsnetworkasalinktothemulti-levelcomputersystems,integratedcomputer（Computer）,communication（Communication）,display（CRT）andcontrol（Control）technologiessuchas4C,theThebasicideaisdecentralizedcontrol,centralizedoperations,hierarchicalmanagement,flexibleconfiguration,easyconfiguration.

DCShasthefollowingcharacteristics:

（1）highreliabilityoftheDCSsystemtocontrolthespreadofthecomputerimplementation,thesystemusesfault-tolerantdesignofthestructure,soacomputersystemmalfunctionwillnotcausethelossofotherfunctions.Inaddition,eachco