LabVIEWIntroduction.ppt

VirtualInstrumentationWithLabVIEW,CourseGoals,UnderstandthecomponentsofaVirtualInstrumentIntroduceLabVIEWandcommonLabVIEWfunctionsBuildasimpledataacquisitionapplicationCreateasubroutineinLabVIEW,SectionI,LabVIEWtermsComponentsofaLabVIEWapplicationLabVIEWprogrammingtoolsCreatinganapplicationinLabVIEW,FrontPanelControls=InputsIndicators=OutputsBlockDiagramAccompanying“program”forfrontpanelComponents“wired”together,LabVIEWProgramsAreCalledVirtualInstruments(VIs),BooleanControl,DoubleIndicator,WaveformGraph,PanelToolbar,VIFrontPanel,VIBlockDiagram,NumericConstant,ThermometerTerminal,CalltosubVI,WhileLoop,KnobTerminal,StopButtonTerminal,StopLoopTerminal,TemperatureGraph,ControlsandFunctionsPalettes,Graphical,floatingpalettesUsedtoplacecontrolsdataflowisanimatedusingbubbles.Valuesaredisplayedonwires.,Right-clickonwiretodisplayprobeanditshowsdataasitflowsthroughwiresegmentYoucanalsoselectProbetoolfromToolspaletteandclickonwire,SectionIISubVIs,WhatisasubVI?MakinganiconandconnectorforasubVIUsingaVIasasubVI,SubVIs,ASubVIisaVIthatcanbeusedwithinanotherVIAdvantagesModularEasiertodebugDonthavetorecreatecodeRequirelessmemory,IconandConnector,AniconrepresentsaVIinotherblockdiagramsAconnectorshowsavailableterminalsfordatatransfer,SubVIs,SubVIs,StepstoCreateaSubVI,CreatetheIconCreatetheConnectorAssignTerminalsSavetheVIInserttheVIintoaTopLevelVI,CreatetheIcon,Right-clickontheiconinthediagramorfrontpanel,CreatetheConnector,Rightclickontheiconpane(frontpanelonly),AssignTerminals,SaveTheVI,ChooseanEasytoRememberLocationOrganizebyFunctionalitySaveSimilarVIsintoonedirectory(e.g.MathUtilities)OrganizebyApplicationSaveallVIsUsedforaSpecificApplicationintoonedirectoryorlibraryfile(e.g.Lab1FrequencyResponse)LibraryFiles(.llbs)combinemanyVIsintoasinglefile,idealfortransferringentireapplicationsacrosscomputers,InserttheSubVIintoaTopLevelVI,Accessinguser-madesubVIsFunctionsSelectaVIOrDragiconontotargetdiagram,TipsforWorkinginLabVIEW,KeystrokeShortcutsActivate/DeactivateContextHelpWindowRemoveBrokenWiresFromBlockDiagramToggleBetweenFrontPanelandBlockDiagramUndo(AlsoinEditMenu)TabKeyToggleThroughToolsonToolbarToolsOptionsSetPreferencesinLabVIEWVIPropertiesConfigureVIAppearance,Documentation,etc.,SectionIIIDataAcquisition,Dataacquisition(DAQ)basicsConnectingSignalsSimpleDAQapplication,Sensors,DAQDataAcquisition,Plug-inboardforacomputerwith:AnaloginputchannelsAnalogoutputchannelsCountersDigitalI/OControlledbyasuiteofLabVIEWVIsFunctionsDataAcquisition,DAQDataAcquisition,SimpleTemperatureAcquisitionExampleTwoparametersDevice=1Channel=0,DataAcquisitionTerminology,Resolution-DeterminesHowManyDifferentVoltageChangesCanBeMeasuredLargerResolutionMorePreciseRepresentationofSignalRange-MinimumandMaximumVoltagesSmallerrangeMorePreciseRepresentationofSignalGain-AmplifiesorAttenuatesSignalforBestFitinRange,DoNotDeleteThisSlide,HardwareConnections,BNC-2120,SCB-68,SC-2075,Exercise2SimpleDataAcquisition,CompleteConvertCtoF.vi,thencreateThermometer.vi.,DoNotDeleteThisSlide,SectionIVLoopsandCharts,ForLoopWhileLoopChartsMultiplots,Loops,WhileLoopsHaveIterationTerminalAlwaysRunOnceRunAccordingtoContinueTerminal,ForLoopsHaveIterationTerminalRunAccordingtoinputN,Loops(cont.),ForLoop,SelecttheloopEncloseCodetoRepeat,Charts,WaveformchartspecialnumericindicatorthatcandisplayahistoryofvaluesControlsGraphsWaveformChart,WiringDataintoCharts,SinglePlotCharts,MultiplotCharts,Exercise3MonitoringTemperature,StudentsbuildTemperatureMonitor.vi.,SectionVArrays)ContextHelpWindowshowsavailablefunctions,Notesemicolon,SectionIXPrinting&Documentation,PrintFromFileMenutoPrinter,HTML,RichTextFileProgrammaticallyPrintGraphsorFrontPanelImagesDocumentVIsinVIPropertiesDocumentationDialogAddCommentsUsingFreeLabelsonFrontPanel&BlockDiagram,Printing,FilePrintGivesManyPrintingOptionsChoosetoPrintIcon,FrontPanel,BlockDiagram,VIHierarchy,IncludedSubVIs,VIHistoryPrintPanel.vi(FunctionsApplicationControl)ProgrammaticallyPrintsaFrontPanelGenerate&PrintReports(FunctionsReportGeneration)SearchinFindExamplesforReportGeneration,DocumentingVIs,VIPropertiesDocumentationProvideaDescriptionandHelpInformationforaVIVIPropertiesRevisionHistoryTrackChangesBetweenVersionsofaVIIndividualControlsDescriptionandTipRightClicktoProvideDescriptionandTipStripUseLabelingTooltoDocumentFrontPanels&BlockDiagrams,SectionXBasicProgrammingArchitecture,SimpleVIArchitectureGeneralVIArchitectureStateMachineArchitecture,SimpleVIArchitecture,FunctionalVIthatproducesresultswhenrunNo“start”or“stop”optionsSuitableforlabtests,calculationsExample:ConvertCtoF.vi,GeneralVIArchitecture,ThreeMainStepsStartupMainApplicationShutdown,StateMachineArchitecture,AdvantagesCangofromanystatefromanyotherEasytomodifyanddebugDisadvantagesCanloseeventsiftwooccuratthesametime,States:0:Startup1:Idle2:Event13:Event24:Shutdown,Exercise7SimpleStateMachine,DoNotDeleteThisSlide,SectionXIRemoteFrontPanels,View&ControlLabVIEWFrontPanelsfromaWebBrowserRequiresnoprogrammingRemoteclientssee“live”frontpanelupdatesMultipleclientscanviewthesamepanelsimultaneouslyOnlyoneclientcancontrolthefrontpanelatatime,RemotePanelWebPublishingTool,ToolsWebPublishingTool,ClickSavetoDiskandVIisEmbeddedintoanHtmlFileAfterFileisSaved,ItCanBeReopenedandCustomizedinAnyHtmlEditor,RemoteFrontPanels-Resources,NIDeveloperZone()SearchforRemoteFrontPanelT