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Solution to Labview buffer size problem
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10/01/2015 AnalogVoutputbuffersizeerror200609usingDAQassistantDiscussionForums
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baldinitMember
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AnalogVoutputbuffersizeerror200609usingDAQassistant Options1107200705:54PM
AllI'mtryingtodousingDAQassistantisoutputaconstantvoltagebutIkeepgettingerror200609,selectedbuffersize:1,min.req.buffersize:2.howdoiselectthebuffersize?Thanks,Todd
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ImaUMember
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Re:AnalogVoutputbuffersizeerror200609usingDAQassistant Options1109200709:57AM
HelloTodd,Ihopealliswellwithyou.FrommyunderstandingyouareusingtheDAQassistanttocreateanAnalogoutputvoltagetasktooutputaconstantvoltage.Youthenreceiveerror200609.Error200609iscausedwhenabufferiscreatedbuttheselectedsizeofthebufferistoosmall.ThiscansolvedbyincreasingthebuffersizeusingDAQmxConfigureOutputBufferinLabVIEW.UsingNIDAQmxinLabVIEW,memoryallocationistypicallyhandledautomaticallyforyouifyouusetheDAQmxTiming.vi:Iftheacquisitionisfinite(samplemodeontheDAQmxTiming.viissettoFiniteSamples),NIDAQmxallocatesabufferequalinsizetothevalueofsamplesperchannel.Iftheacquisitioniscontinuous(samplemodeontheDAQmxTiming.viissettoContinuousSamples),NIDAQmxwillallocateabufferaccordingtothefollowingtable:SampleRateBufferSize0100S/s1kS10010,000S/s10kS10,0001,000,000S/s100kS>1,000,000S/s1MSYoucanmanuallyoverrideNIDAQmx'schoiceofbuffersizebycallingtheDAQmxConfigureInputBuffer.vi(orDAQmxConfigureOutputBuffer.viforoutputoperations)THisVIcanbefoundbyrightclickingontheblockdiagramandselectingMeasurementI/O>>NIDAQmx>>TaskConfig/Ctrl>>BufferNode.Rightclickonthetaskinputandselectcreate>>constant.SelecttheVoltageoutputtaskthatyougeneratedinMAXfromthedropdownmenu.RightclickontheOutput:Buffersizeandselectcreate>>constant.Select2fortheconstant.Formoreinformation,refertotheLabVIEWHelpfortheDAQmxConfigureInputBuffer.viandtotheNIDAQmxHelp.YoucanaccessthehelpfortheDAQmxConfigureInputBuffer.vibyrightclickingontopoftheVIandselectingtheHelpoption.YoucanaccesstheDAQmxHelpbyselectingStart>>Programs>>NationalInstruments>>NIDAQ>>NIDAQmxHelp.AdditionalResources:NIDAQmxExpressVITutorialGettingStartedwithNIDAQmx
If,foranyreason,thispostdidnotsolvetheproblempleaseanswerthefollowingquestionsandattachyourVI.WhichDAQcardareyouprogramming?Whatistheconstantvoltageyouareoutputtingfromthehardware?
Regards,
ImaApplicationsEngineerNationalInstrumentsLabVIEWIntroductionCourseSixHoursGettingStartedwithNIDAQmx
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BilkentMember
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Re:AnalogVoutputbuffersizeerror200609usingDAQassistant Options0815201110:38AM
Ihavethesameproblem.Ihavetriedwhatyouhavesaidtosolvetheproblembutiguessididsomethingwrong.Iattachedmy.vi.IhaveNIPCI6229asdataacquisitioncardandiwanttocontrolalinearmotorthroughafeedbackcomingfromIK220countercardforHeidenhainlinearencoder.Thanksinadvance.
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BeutlichMember
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Re:AnalogVoutputbuffersizeerror200609usingDAQassistant Options0816201102:24PM
Theerrorcodeyoureceivedlikelysays"Generationcannotbestarted,becausetheselectedbuffersizeistoosmall.Increasethebuffersize.SelectedBufferSize:1MinimumRequiredBufferSize:2".Inyourcode,youarewiringasingleelementfromthePIDVItotheDAQAssistantExpressVI.Theerrorstatesthatyouneedatleasttwovaluesinordertofunctionwiththecontinuousupdate.Someboardssupporthardwaresinglepointmode,whichallowsyoutopushonedataelementatatimeratherthansendthevaluestothedeviceinchunks,butallyoureallyneediseitherbuildanarrayofthedesiredvalues.
Regards,
Beutlich
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