DCS和PLC区别总结的比较好的一篇文章.docx

DCS和PLC区别总结的比较好的一篇文章.docx

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DCS和PLC区别总结的比较好的一篇文章

TheDifferenceBetween

DCSandPLC

Inthepowerplantautomationinthermalfield,DCSandPLCistwocompletelydifferentandhavesomethingtotheconceptofcontact.DCSandPLCiscomputertechnologyandindustrialcontroltechnology,thecombinationofthepowerofthemainenginecontrolsystem,andiswithDCSPLCismainlyappliedinthepowerplantauxiliaryworkshop.DCSandPLChasoperatorstationprovidesthemeansofhuman-computerinteraction,relyonthecontrollerbasedoncomputertechnologytocompletecontroloperation,allthroughtheI/Ocardfinishedandacomponentandexecutionofthedevicedataexchange,hascallednetworkcommunicationssystem.DCSandPLCsosimilar,whythereisacompletelydifferentconceptinengineeringpractice,wehowtochoose?

Thispaper,fromthehistoricalevolution,technicalfeatures,developmentdirectionandsoonseveralaspectsarereviewedinthispaper,thehopecanbereferenceforthethermalprofessionals.TheDCSinNETWORK6000+asanexample,thepapertriestodetailedclearexamples.

1ThehistoryandcoreconceptofDCSandPLC

DCSforDISTRIBUTEDCONTROLSYSTEM.Referstothedangerousscatteredanddataset.70stoenterthemarket,completetheanalogcontrolwithPIDoperation,insteadofthesimulationmainlycontrolinstrument.FirstproposedakindofsuchthoughtsofDCSinstrumentmanufacturers,atthattimeismainlyusedinchemicalindustry.Andinthe60sPLCsuccessfullydeveloped,calledtheLogicoperationofthePLC（ProgrammableController）,basedasPLC.Mainlyisusedinautomobilemanufacturing.

DCSanddesignprincipleoflargedifferencewithPLC,PLCtouchtherelaycopyfromthecontrolprincipleoftheriseanddevelopmentofthe70s,onlytheswitchquantitylogiccontrolofPLC.It’stostoretoperformthelogicoperation,sequencecontrol,timing,countingandoperationoftheoperationinstructions;Andthroughthedigitalinputandoutputoperation,tocontrolallkindsofmechanicalorproductionprocess.Usersoftheproductionprocesscontrolprogramtoexpresstheprocessrequirement.WillitinthePLCprogrammemory,theruntimeusersaccordingtostorethecontentoftheprogramexecutiontocompleteideallysuitedtoprocesstherequiredaction.

DCSoperationalamplifierisinonthebasisofthedevelopmentofmay.Putallthefunction,therelationshipbetweenthevariousprocessvariablesaresuccessfuldesigncanblock.Inthemid70's,theDCSonlyanalogcontrol.

DCSandPLCcontrolleristhemaindifferenceintheswitchquantityandanalogcomputing,eveniflaterbothmutualsomepenetration,buttherearestilldifferences.Sincethe80s,PLClogicaloperationsoutside,alsoinadditiontoaddingsomecontrolcircuitalgorithm,buttocompletesomecomplexoperationormoredifficultwithladder-diagramprogramming,PLC,analogcomputingwhenprogramminginnottoo,intuitive,andprogrammingismoretroublesome.Butinthesolutioninlogic,showtheadvantagesoffast.AndDCSusefunctionofpackagingsimulationcalculationandlogicoperations,whetherlogicoperationorcomplexsimulationofoperationformsofexpressionareveryclear,butrelativelyPLCfortheexpressionofthelogicaloperationefficiencyislow.

DCSandPLCinthehistoricalevolutiondifferencesisobvious,theirsubsequenthadagreatinfluence.However,thegreatestimpactonsubsequentdevelopment,andnotthedifferenceinorigintechnology,butitsorigin,thedifferencebetweentheconcept.DCSofthecoreconceptsofthedangerisscattereddataset,thecomputercontrolsystem,thereforethedevelopmentofDCS,whichisintheprocessofcontinuoususeofcomputertechnology,thecommunicationtechnologyandthelatestachievementsofcontroltechnology,tosetupacompletesystemofthedistributedcontrol,DCSofferusersisacompleteforindustrialcontrolofthesafetyandsecurityofhighlyefficientandflexiblesolutions.AndthecoreconceptsofPLCprogrammablecontrolleris,thepurposeisusedtoreplacerelays,executinglogicandtimeapartandcontrolfunctions,establishtheorderofflexibleprogramcontroldevice.So,PLCofthedevelopmentofthemainlineisconstantlyimprovetheabilityindex,touserswithaperfectfunctionofflexiblecontroldevice.

DCS,PLCisasystemisadevice,thisisbothinthefundamentaldifferencebetweentheconcept.Thisdifferencewastheimpactofthedeep,itintothetechnologyeveryaspectoftheeconomy.

2DCSandPLCtechnologycharacteristicsandmutualinfiltration

Differentconceptualbasis,differentpathmakesDCSandPLChavedifferenttechnicalcharacteristics,andthedevelopmentoftechnologyisnotclosed,learnfromeachothermutualinfiltrationhasalwaysthroughoutthedevelopmentprocess.

2.1,controlprocessingpower

Weknow,aPLCcontroller,oftencandealwiththousandso