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1、AtypicalDCScontrolsystemDCS(Distributedcontrolsystem)isamicroprocessor-basedcentralizedonitoringoftheproductionprocess,operation,management,centralizedanddecentralizedcontrolofdistributedcontrolsystem,calledDCS.Thesystemwillbeusedinanumberofunitsdistributedprocesscontrolcomputer,allinformationth
2、roughthecommunicationnetworkbythehostmanagementcomputermonitor,toachieveoptimalcontrol,thedeviceinheritstheconventionalinstrumentdistributedcontrolandtheadvantagesofcomputercontroltoovercomethenormalfunctionofasingleinstrument,Human-MachineContactpoorandthesingleriskofmicro-computercontrolsystem
3、ofahighconcentrationofdefects,bothachievedinthemanagement,operationanddisplayofthreeconcentrate,butalsorealizedinfunctionality,loadandriskofspreadinthreeareas.DCSsysteminthemodernproductionprocesscontrolplaysanimportantrole.Distributedcontrolsystemstypicallyhavethefollowingfourcomponents:Fieldco
4、ntrollevelknownasdataacquisitiondevices,mainlythenon-controlvariablesduringdataacquisitionandpreprocessing,andfurtherprocessingofreal-timedatafortheCRTdisplayandprintoperationstation,inordertoachieveopen-loopmonitoring,andcollecteddatatomonitoringcomputer.OutputdeviceinaPCcase,orcanswitchanalogs
5、ignalsthewaythecomputeroutputtotheterminaldevicecontrolcommands.Thisisoneleveldirectlytothescene,theprocessisconnectedwiththesite.Suchasvalves,motors,sensors,transmitters,actuatorsandsoon.Theyarethebasisforindustrialfielddevice,itisalsothebasisofDCS.IntheDCSsystem,thisleveloffunctionistoobeythec
6、ommandssentbythehostcomputer,whileupward-bitmachinefeedbackimplemented.Takeforexamplethearmedforcestothecase,canbedescribedasthebottomofthesoldiers.Theyjustfollowordersaccuratelyandpreciselyreportthesituationtohigherauthoritiestocompletethemission.Asforitsexchangewiththehostcomputeristhroughthea
7、nalogsignalorfieldbusdigitalsignal.Becauseanalogsignalsinthetransmissionprocess,therearesomemoreorlessdistortionorinterference,sobypopularfieldbusforDCSsignals.ProcesscontrollevelAlsoknownasthebasicfieldcontrolunitorcontroll
