基于嵌入式ARM平台的远程IO数据采集系统的研究和开发.docx

基于嵌入式ARM平台的远程IO数据采集系统的研究和开发.docx

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基于嵌入式ARM平台的远程IO数据采集系统的研究和开发

ResearchandDevelopmentoftheRemoteI/ODataAcquisitionSystemBasedonEmbeddedARMPlatform

INTRODUCTION

Withthewideuseofthenetworked,intelligentanddigitaldistributedcontrolsystem,thedataacquisitionsystembasedonthesingle-chipisnotonlylimitedinprocessingcapacity,butalsotheproblemofpoorreal-timeandreliability.Inrecentyears,withtherapiddevelopmentofthefieldofindustrialprocesscontrolandthefastpopularizationofembeddedARMprocessor,ithasbeenatrendthatARMprocessorcansubstitutethesingle-chiptorealizedataacquisitionandcontrol.EmbeddedARMsystemcanadapttothestrictrequirementsofthedataacquisitionsystem,suchasthefunction,reliability,cost,size,powerconsumption,andsoon.Inthispaper,anewkindofremoteI/OdataacquisitionsystembasedonARMembeddedplatformhasbeenresearchedanddeveloped,whichcanmeasureallkindsofelectricalandthermalparameterssuchasvoltage,current,thermocouple,RTD,andsoon.ThemeasureddatacanbedisplayedonLCDofthesystem,andatthesametimecanbetransmittedthroughRS485orEthernetnetworktoremoteDASorDCSmonitoringsystembyusingModbus/RTUorModbus/TCPprotocol.Thesystemhasthedualredundantnetworkandlong-distancecommunicationfunction,whichcanensurethedisturbrejectioncapabilityandreliabilityofthecommunicationnetwork.Thenewgenerationremotedataacquisitionandmoni-toringsystembasedonthehigh-performanceembeddedARMmicroprocessorhasimportantapplicationsignificance.

STRUCTRUEDESIGNOFTHEWHOLESYSTEM

ThewholestructurechartoftheremotedataacquisitionandmonitoringsystembasedonembeddedARMplatformisshowninFigure1.Intheschemeofthesystem,theremoteI/OdataacquisitionmodulesaredevelopedbyembeddedARMprocessor,whichcanbewidelyusedtodiversifiedindustriessuchaselectricpower,petroleum,chemical,metallurgy,steel,transportationandsoon.Thissystemismainlyusedfortheconcentrativeacquisitionanddigitalconversionofavarietyofelectricalandthermalsignalssuchasvoltage,current,thermalresistance,thermo-coupleintheproductionprocess.ThentheconverteddatacanbedisplayedontheLCDdirectly,andalsocanbesenttotheembeddedcontrollerthroughRS485orEthernetnetworkcommunicationinterfacebyusingModbus/RTUorModbus/TCPprotocol.Thedataintheembeddedcontrollerplatformistransmittedtothework-stationsofremotemonitoringcenterbyEthernetafterfurtheranalyzedandpro-cessed.Atthesametime,thesedatacanbestoredintherealtimedatabaseofthedatabaseserverinremotemonitoringcenter.Thesystemhasthedualredun-dantnetworkandlong-distancecommunicationfunction,whichcanensurethedisturbrejectioncapabilityandreliabilityofthecommunicationnetwork.

ThehardwareplatformoftheRemoteI/Odataacquisitionsystembasedonemb-eddedARMuses32-bitARMembeddedmicroprocessor,andthesoftwareplat-formusesthereal-timemulti-taskoperatingsystemuC/OS-II,whichisopen-sourceandcanbegrafted,cutoutandsolidified.Therealtimeoperatingsystem（RTOS）makesthedesignandexpansionoftheapplicationbecomesveryeasy,andwithoutmorechangeswhenaddnewfunctions.Throughthedivisionoftheappli-cationintoseveralindependenttasks,RTOSmakesthedesignprocessoftheapplicationgreatlysimple.

Figure1Structureofthewholesystem

THEHARDWAREDESIGNOFTHESYSTEM

TheremoteI/OdataacquisitionsystembasedonembeddedARMplatformhashighuniversality,eachacquisitiondeviceequippedwith24-wayacquisitionI/Ochannelsandisolatedfromeachother.EachI/Ochannelcanselectavarietyofvoltageandcurrentsignals,aswellastemperaturesignalssuchasthermalresis-tance,thermocoupleandsoon.Thevoltagesignalsintherangeof0-75mV,1-5V,0-5V,andsoon,thecurrentsignalsintherangeof0-10mAand4-20mA,thethermalresistancemeasurementcomponentsincludingCu50,Cu100,Pt50,Pt100,andthethermocouplemeasurementcomponentsincludingK,E,S,T,andsoon.

Figure2.StructureoftheremoteI/Odataacquisitionsystembasedon

ARMprocessor

ThestructuraldesignoftheembeddedremoteI/OdataacquisitionsystemisshowninFigure2.Thesystemequippedwithsomeperipheralssuchaspower,keyboard,reset,LCDdisplay,ADC,RS485,Ethernet,JTAG,I2C,E2PROM,andsoon.TheA/Dinterfacecircuitisindependentwiththeembeddedsystem,whichisindependentwiththeembeddedsystem,whichissystemhassettingbuttonsand128*64LCD,whichmakesthedebuggingandmodificationoftheparameterseasy.ThecollecteddatacanbesenttotheremoteembeddedcontrollerorDAS,DCSsystembyusingModbus/RTUorModbus/TCPprotocolthroughRS485orEth-ernetcommunicationinterfacealso,andthenbeusedformonito