How to set DAQmx period task input terminal

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  Hello

  You can check the link below to create the scheduled task in Windows XP.

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  http://support.Microsoft.com/kb/308569

• How to set up wizard DAQ or DAQmx tasks using an external text such as a CSV file?

  I work in an environment were we have a lot of users VI. I develop the VI and technical personnel using the GUI (cover Page) to collect the data. In order to control the input parameters used on multiple hardware platforms, I'd like to develop a generic VI which will import or read a text file I created, and configures the DAQmx tasks to perform data acquisition. In fact, I have the generic VI full and need to understand how to make configurations DAQmx more transparent for the end user as long as the end user has the text file to import. For example, to generate the wizard DAQ DAQmx tasks based on information from text file?

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• How can I set up a digital input task to read continuous samples?

  I am trying to create an exclusively digital task that will make digital readings at a rate timed by the material using a PCIe-6509. However, when I try to put the task timing as follows (which works on a PCIe-6509), I get the following error:

  Requested value is not supported for this property value. The value of the property may be invalid because it is in conflict with another property.

  Property: NationalInstruments.DAQmx.Timing.SampleTimingType

  Required value: NationalInstruments.DAQmx.SampleTimingType.SampleClock

  Possible values: NationalInstruments.DAQmx.SampleTimingType.OnDemand, NationalInstruments.DAQmx.SampleTimingType.ChangeDetection

  Task name: DigitalInputTask

  State code:-200077

  The relevant parts of my code are:

      public class DigitalInputReader: IDisposable
      {    
          public DigitalInputReader()
  
          {
  
              dataReadyHandler = new System.AsyncCallback (DataReadyEventHandler);
  
  daqmxTask = new DigitalInputTask();
  
              daqmxTask.Configure (Globals.NI);
  daqmxTask.Control (TaskAction.Verify);
  
              daqmxTask.Control (TaskAction.Commit);
  daqmxReader = new DigitalMultiChannelReader (daqmxTask.Stream);
  
          }
  public class DigitalInputTask: task
  
          {
  public DigitalInputTask(): {base ("DigitalInputTask")}
  public virtual void Configure (NiConfiguration niConfig)
  
          {
  
              <= niconfig.digitalinputs.count="" -="" 1;="">
  
              {
  
                  String physicalChannelName = niConfig.Device + "/ port" + niConfig.DigitalInputs [i]. Port.ToString () + "/ line" + niConfig.DigitalInputs [i]. Channel.ToString ();
  
                  String nameToAssignToChannel = niConfig.DigitalInputs [i]. Name;
  DIChannel ch is this. DIChannels.CreateChannel (physicalChannelName, nameToAssignToChannel, ChannelLineGrouping.OneChannelForEachLine);
  
                  c. InvertLines = niConfig.DigitalInputs [i]. InvertLines;
  
              }
  
              var signalSource = "";
  
              This. Timing.ConfigureSampleClock (signalSource, Globals.MachineSettings.SampleRate, SampleClockActiveEdge.Rising, SampleQuantityMode.ContinuousSamples);// Globals.MachineSettings.SamplesPerChannel);
  
          }
  
      }

  The last call to Task.Timing.ConfigureSampleClock, it's which throw errors.

  Of the options available, or SampleTimingType.OnDemand or NationalInstruments.DAQmx.SampleTimingType.ChangeDetection provide the same precisely timed calls that I am familiar with the analog input interruptions.

  How is it possible in a digital task?  I mean, it seems that I could set up another task to do call by material for the production of a clock signal and use the ChangeDetection synchronization mode, but this seems a bit complicated for what should be easy to do.  What Miss me?

  Update: I thought about it.  You cannot call ConfigureSampleClock when the digital input card is a device of 650 x, because these devices have any automated examples of clock.  They are configured to run in mode default finite samples.  You must make all sample synchronizing with these devices in the software.

  Be cautious, however, because the .NET timers ensure they put any faster than their scheduled interval.  In practice, they are usually 5 to 10 ms slow by tick.  This means that if you want to read samples every 100 ms by sample clock, you'd end up reading all 108 ms samples.  All counters based on the elapsed time and number of samples would be away after a few seconds of it.

  Instead, you must do one of four things: write a doggone driver that runs in ring 0 and interfaces with the PCIe card in the required interval (i.e. on NC, not you, in practice), tolerate the inclination of the clock, use a multimedia timer as an interruption audio or video that is more likely to respond to the correct interval, or , my solution, an accurate clock allows you to set the interval of the timer.  I wrote the following code to the timer:

  var CorrectiveStopwatch = new System.Diagnostics.Stopwatch();
  
  var CorrectedTimer = new System.Timers.Timer()
  
  {

  
  Interval = targetInterval,
  AutoReset = true,
  };
  CorrectedTimer.Elapsed += (o, e) =>
  {
  var actualMilliseconds =;

  Adjust the next tick so that it's accurate
  EG: Stopwatch says we're at 2015 ms, we should be at 2000 ms
  2000 + 100 - 2015 = 85 and should trigger at the right time
  var StopwatchCorrectedElapsedMilliseconds = newInterval +.
  targetInterval-
  CorrectiveStopwatch.ElapsedMilliseconds;

  If we're over 1 target interval too slow, trigger ASAP!
  <=>
  {
  NvelIntervalle = 1;
  }

  CorrectedTimer.Interval = NvelIntervalle;

  StopwatchCorrectedElapsedMilliseconds += targetInterval;
  };

  I hope this helps someone.

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  Surendra salvation.

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• How to set the voltage on a 3.3 volt NI 9237 module?

  Hello

  How to set the voltage on a 3.3 volt NI 9237 module?

  The voltage is now at 2.5 volts.

  This is my first time with this camera.

  This set of MAX or are there jumpers?

  I want the value of the excitation voltage at 3.3 Volts and do not change.

  The NI 9237 is a NEITHER cDAQ-9172.

  Thank you

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  Hi POBA,.

  This can be set to your programming environment.  For example, LabVIEW Signal Express, a task of MAX, or a DLL call in a text-based environment.  You want to create a strain, tension Custom with excitement, or any bridge based task in any environment.

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  "" "In LabVIEW, place a DAQ Assistant" acquire signals "analog input"...

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• How to set the timeout of read when using channelReader.ReadWaveform?

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  Here is the code:

  privateAnalogMultiChannelReaderchannelReader;

  privateAnalogWaveform awf;

  publicList GetWaveForm()

  {

  Try

  {

  Task getWaveform = newTask();

  getWaveform.AIChannels.CreateVoltageChannel (Channel,"", TerminalConfiguration, RangeMinimum,

  RangeMaximum, AIVoltageUnits.Volts);

  getWaveform.Timing.ConfigureSampleClock ("", SampleRate, SampleClockActiveEdge.Rising,)

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  channelReader = new AnalogMultiChannelReader (getWaveform.Stream);

  AnalogWaveformdata = channelReader.ReadWaveform (NumSamples);

  AWF = data [0];

  samples As new List();

  for (inti = 0; i)

  returnsamples;

  }

  catch (DaqExceptionexception)

  {

  MessageBox.Show (exception. (Message);

  }

  List of l = newList();

  return l;

  }

  Thank you

  Curt

  Hi Curt,.

  Here is a Knowledge Base that can help you to set the timeout setting in your code:

  The property using Timeout of DAQmx task in Visual Studio

• more info on the DAQmx control task

  Today I came across an older post where I had some questions and Jeff· just Þ· Bohrer showed a good example, it's here:

  http://forums.NI.com/T5/LabVIEW/AES-single-element-queues-data-value-references/m-p/2978093/HIGHLIGH...

  I doesn't pay attention to the DAQmx task manages the part, but now some new questions of time came to my mind, I hope someone can give me some explanations...

  Usually, when I'm working with some hardware with DAQmx driver, I simply specify the channel, and I use the VI of virtual channel create for my work I want to use.

  Recently I read about benefits use MAX to previously create some global (?) of the tasks (for example a cDAQ with many modules and i/o channels) and using these tasks in a LabVIEW project. In this case I can just skip the 'Create Virtual Channel.vi', begins with the measurement with a "Start Task" DAQmx and stopping a VI 'stop the task', correct? However in the link above, the VI "Task of control" (next), first used with a parameter "commit" and during the closing of the measure, with a setting of "Cancel" (and no task to stop vi was used).

  I threw an eye using the Task.vi 'control', but the info it is not too detailed, where I can find a few more details, or maybe someone might highlight the use and benefits of this vi? Sounds a bit 'funny' aid, as for the parameter commit: "Programs the hardware as much as possible depending on the configuration of the task."

  So what is the difference between the use of the "task of control" in a code and do not use it (so when we use only the start and the stop task live)? Do we not the same behavior with the latter?

  Thanks in advance!

  Martins wrote:

  The overall task configured max subject: we conduct research, so I always just develop for our lab, we do not sell anything. However, I have some questions related to a task configured and saved to the MAX:

  • So I have a task created at MAX, I guess that this task will be usable only if I use it in a project of LV on the same PC? What if I need to move my application to another PC (but of course with the same modules cDAQ, etc., but perhaps under different numbers...)

  The task can also be used with a .exe. You can export MAX settings to a file (file, export...) .nce, and then import the settings to a new PC. If necessary you can tweek the numbers.

  • I would like to create an EXE from my code and don't run this EXE to our systems (not install). Y at - he tips that I should keep in mind when I create an executable from a project that contains a task of MAX?

  I can't think of something special. Personally, I prefer to load the name of the task from a configuration file, you can also use a control on the front panel to select the task.

  I have a feeling, when we need complete flexibility, the course of MAX isn't really practical, Yes? I want to say, if we want to for example programmatically recognize all our application materials and create tasks to ensure that all physical changes on the side of the PC in the future will not affect our code?

  I agree that you have as much flexibility, but for my applications most of the time MAX provides sufficient flexibility

  But this scenario could be documented for future users in the lab, I imagine, so what they have to do, is to recreate the overall task? What happens when we take the application as an exe on another PC and manually re-create the (I hope that quite the same) necessary global task with the same name that awaits the EXE? It works this way?

  Thanks for the very useful info!

  Edit: "Yes you can set a MAX task that includes several modules and channels so that they all have the same type of action."

  This is also a limitation compared to the creation of code depending on task, Yes? I mean, using the DAQmx 'Create Virtual Channel.vi', we can even combine for example analog inputs with for example in a cDAQ thermocouple hunts...

  No it is not a limitation, for thermocouple is entered analog. If you can combine them in LabVIEW, you can combine them in MAX.

  Edit2: I really miss other docs of type "real demonstration" of the NEITHER! I could imagine a sort of case study examples where different material handling OR would be explained... Of course we can hunt together pieces of mosaic, but a more compact image could help a lot for those who want to learn faster

  Ben64

• Error-50103 occurred at DAQmx start Task.vi:11

  Hello

  I use a nor-6008 to perform a thermal sector and I get the error "error-50103 occurred at DAQmx Start Task.vi:11 '. I have read other forums of discussion and it seems combe because I use the wizard DAQmx who don't properly resolve the resource when finsihed. I've dug further and saw that it is linked to an on-board clock synchronization problems. However, I can understand how to solve this problem.

  I thought that I create a loop that continuously monitors inputs and sometimes to interrogate the memory so I'm not kidding to the top of the clock. It's much harder to do than sounds. Can someone take a look at my code and give me some advice/suggestions to clean the DAQmx assistants.

  Thanks in advance

  Cole

  I finished by dividing my resource between the two input channels using a single assistant DAQ and dividing down the data rate and the number of samples. Works fine now.

  Big pain in the ass well.

• How to set "Time scale" to "None"?

  Hi expert,
  
  We want to set up an account where user can enter the individual monthly figs, with the total quarterly being either the sum of the value of months under him (i.e. flows), or as the last month of the quarter (balance), while the user can enter a value other than "YearTotal' in 'year Total '.
  
  By default, user grasp what this either in the YearTotal, it would get spread to the individual months under him. Is it possible to disable this spread, so that the user can enter the total of the year, without affecting the monthly entries?
  
  The period dimension is a dense dimension, with summaries members period the value "Dynamic Calc."
  
  I'm trying to adjust the Balance of the 'time' to 'None' and hoping it would then not inherit the flow / characteristic balance in the total of the year. But when I try to deploy the application, I got error, saying: it's an hour not valid balance properties.
  
  Please tell us if:
  i. possible in order to set up a special account where every month and yeartotal inputable user? And if so, how?
  II. what should be the behavior expected if the value "Balance time", "None"? and how to set?
  
  We are on HP version 11.1.2.1.
  
  Thank you!

  How are you making it to "None"?

  You can stop the spread. (Jake Turrell explained how it works in a different thread)

  If you create a form in line with the different months in logical columns/rows (not not selecting them using a function like Idescendents (YearTotal) or Jan, Feb, Mar), select them under the name of each column.

  Column A
  Jan
  Column B
  Feb
  .......

  Then spread will not work.

  I don't think you can possibly do this job using low version upwards. (simple reason that schedule does not allow you to write to top member, if your version is low at the top)

  You can create a Standard Version of the target and then use the method above (splitting method of individual columns months) to achieve this.

  Why do you want to enter YearTotal, why not use BegBalance and add values to this member? (Just a thought)

  Concerning

  Celvin

  http://www.orahyplabs.com

  Please check the answers as useful/correct as appropriate