Error-200279 was held at lu DAQms (analog 1 Wfm NChan Nsamp d) .vi2

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• Add DAQmy Read data (analog 1-d NChan NSamp Wfm) to the shift register

  I have problems when you try to add Reading of DAQmy (analog 1 Wfm NChan NSamp d) data to the registry to offset inside the structure of cases the timeout event. DAQmy Read data 1 d table 3 waveforms (I use 3 channels). I tried with build table (also with additional and for loop, to generate the data for each channel separately), but without success. Suggestions, ideas?

  As I am having some problems attach file .vi, I posted a link where to get the files zip package:

  https://DL.dropboxusercontent.com/u/12580896/vibration_meas_V7.zip

  
  

• Stuck in the error-200279

  My program involves several DAQ tasks that run in unison, as in the example of "Multi-multifunction-Synch I-AO. Works very good in general, but if anything it either never interrupts the flow of the program, I'm stuck permanently with the error 200279. Here is the precise relationship:

  Error 200279 occurred at DAQmx Read (analog 1-d Wfm NChan NSamp) .vi:1

  Possible reasons:

  Attempted to read samples that are no longer available. The requested sample was already available, but has since been replaced.

  Increase in the size of buffer, most frequently the reading of data or by specifying a fixed number of samples to read instead of reading all available samples would correct the problem.

  Property: RelativeTo
  The requested value: current playback Position
  Property: Offset
  Required value: 0

  Task name: input analog

  And once I am in that State, the only way I can find out is to kill and restart all my tasks. There must be a better way? How to resync the computer firm asking former samples and welcomes those who are there NOW?

  Here are a couple of reliable means to bring about this problem: 1. reach a breakpoint during debugging. It's very frustrating when you can't use a breakpoint without destroying the same operation you are trying to debug. 2. the user presses a button that opens a file dialog box. Even though my main program consists of several parallel loops, and the dialog file is called from a DIFFERENT LOOP that makes the acquisition of data. It's a problem anyway. How can I make a file dialog box without stopping my stream of data acquisition along the way?

  Help much appreciated. This problem stop my program to be the work of industrial power that needs my scientific users.

  Thank you
  Ken

  Ken,

  You can specify DAQmx what samples in the buffer to read.  By default, DAQmx will read the 'current reading position.  What you see is that the data not read from "current playback position" got too written with new data.  Basically the data that was in the 'current reading position"no longer exist, and try to read from that location you causes the error you see.  DAQmx does not specify where it reads data since.  You can use the property Read DAQmx node to specify what DAQmx reads Relative to, but also a shift here in the buffer.  It is possible that if you detect this error, you can read from 'most recent sample' for a reading.  This would throw essentially all of the data in the buffer between the "current playback position" and the most recent sample in the buffer, but would allow your application to continue, as it is equipped to address the shortcomings in the data.

  Hope that helps,

  Dan

• Error-200279 during analog playback Wfm Nsample

  I called the VI attached at least 10 x in the main VI and works very well, but sometimes it gives me an error-200279. Can someone please tell me why?

  Thank you in advance.

  Your buffer is not large enough.

  You collect the 20,000 samples per second, but only set it to 2000 samples per channel.  This is 1/10 seconds worth of data.  You read 1000 samples at a time, until about 1/20th of a second.  If the loop runs fairly quickly, you can follow and will not get an error.

  If there is a small delay (maybe Windows turns off and does something else for 50 or 100 msec.) your buffer will overflow.

  I would say eliminating the constant 2000 where you set the samples/channel and try again.  See if it behaves better.

• error-200279 card USB-4431 DSA

  

  I use USB-4431 dynamic signal acquisition card.  I have the program set out in the attachment.  I am trying to generate a control shaker random vibration signal and at the same time reading back 2 analog inputs. When I run my code with the full program, I have error-200279 but when I split the acquisition & code generation and put it in a stand alone vi and run it in itself, I don't get any errors.  I tried the different sampling frequencies and samples/channel.  one that seems to work best is when I'm 60 kHz and 20Ks/channel sampling.  My requirement is an example for the acquisition of 200 kHz ane 20Ks/channel.  I've been monitoring the node available samples/channel and seems to continue until no more samples are available and it shows 0.  I need to make these 2 tasks to run correctly in the main program, which is an event focused on loops of master/slave.

  Hi ssherian,

  The USB-4431 is a sampling frequency maximum of 102.4 kech. / s. If your application requires a 200 kech. / s, you will have to use a PCI or PXI-based DSA with a sampling rate WAS higher.

  What about the 200279 error, this error is usually due to a problem with the DAQmx hardware buffer. With a continuous acquisition, a good rule of thumb is to have 10 x the number of samples to read sample rate (i.e. the sample rate = 10000 s/s, samples read = 1000). It is also possible that your computer simply cannot process the data quickly enough. If you perform any complex, analysis of real-time data the processor of your computer simply may not able to catch the flow.

  This KB: error-200279 DAQmx Read Error provides an overview of together in-depth to error 200279, possible causes and measures to resolve the error.

  Hope this helps,

  Chris G

• Try to write data to the file, but error 200279

  I have problems when writing data to a file. 10 seconds in the recording process, I get the error 200279. I did some research on the subject, but I am unable to corect my code. I think I want to increase the size of the buffer, but he prefers, I suppose, to read the data more frequently. The way that I save my file is, before starting the VI, I attribute a location and name of the file (e.g. data.csv). The date and time is added at the end of the actual when file the I start to record the data (e.g. data_07-26 - 13_122615.csv). If the file does not exist, it creates a new file, and then adds the data of this file after each iteration of the loop. The reason why I did this way was so I don't have to worry about running out of memory, but apparently my code is wrong.

  

  

  I will include a copy of the faulty section of my code. Any help would be greatly appreciated.

  Thank you.

  Your problem is that the writing on the disk is slow.  It is pretty slow so it causes your DAQ buffer overflow and cause error and loss of data.  What you need to do is to implement a producer/consumer.  This will put the data acquisition and recording on the disc in separate loops.  This will allow data acquisition work at speed, that he needs to deal with incoming samples and writing on disk can run at all what pace, he can.  You send data from data acquisition to the loop of logging using a queue.

  You can also think about changing how you write to the file.  VI is constantly open and close the file, which is a very slow process if you do it inside a loop.

• Error 200279 and slow program running

  I read a lot of posts about this error but still cannot fix mine. During the execution of the program realizing measures of error 200279 turns suddenly upward. In addition, the program is very slow; I'm trying to read data from a QD and a PSD (two different position detectors) and when I move a detector (QD or PSD, it doesn't bother me) the program response is too slow. I tried to correct the error by setting the value for timeout - 1, but the error is still there. What can I do?

  Thanks in advance,

  Mercurial

  P.D.: Error 200279: tried to read samples that are no longer available. The requested sample was already available, but has since been replaced. Increase in the size of buffer, most frequently the reading of data or by specifying a fixed number of samples to read instead of reading all available samples would correct the problem.

  You need to understand why your VI is so slow.  It go fast then slow down over time?

  I see a lot of things that could cause slowdowns.

  1. a lot of Express VI.  VI Express is designed to facilitate the installation and quickly start code.  They are not known for efficiency.  FIX: Use the regular functions of LabVIEW such as DAQmx and file write.

  2. you write to a file within the loop.  File writing is usually slower than other functions.  Maybe your hard drive slows you down.  FIX: Use producer/consumer and transfer the file to write to another loop indepdendent.

  3. you build graphics XY in the loop.  Inside that express the VI, it is continually adding more data in the tables stored in the shift registers.  These berries grow, windows must track more contiguous memory to store the data.  Eventually, it would run out of memory.  What size are these graphs?  FIX: Sometimes delete these graphics.  (EDIT: I see that you have the "erase data on every setting turned on for that call.)  This may not be a problem.)

  4. you write to the nodes property of each iteration of the loop.  Changing the properties of controls can be quite slow at times.  FIX: Write to a property node where the properties really change.  True to the visibility properties Plot writing is really bad, because you do each iteration, that it never changes.  You may as well just outside the loop.

  Your code to see how long each iteration of the loop is actually taken from reference.  Turn the pieces to see if you can speed it up.

• HAVE DAQmx error-200279

  I run a loop with a N-Chan AI read vi, out its values in a queue which is read by the other parallel loops.  During the operation of the program, when the other loops treat their queues and (from what I can tell) occupy time processor, read it loop returns a 200279 error, saying:

  Error-200279 to AI Read.vi:7

  Possible reasons:

  Attempted to read samples that are no longer available. The requested sample was already available, but has since been replaced.

  Increase in the size of buffer, most frequently the reading of data or by specifying a fixed number of samples to read instead of reading all available samples would correct the problem.

  Property: RelativeTo
  Corresponding value: current playback Position
  Property: Offset
  Corresponding value: 0

  Task name: _unnamedTask<13>

  I am quite puzzled as to why this error keeps popping up.  No one knows what the first cause of this error is usually?

  Hi Jeanius, in my view, that this articlecan explain your problem.

• Using Firefox 4 and Windows 7. Whenever I have to start Firefox from a shortcut to a Web site, what happens with the following error "there was a problem sending the command to the program". The requested site is loaded after that. without any problem.

  Using Firefox 4 and Windows 7. Whenever I have to start Firefox from a shortcut to a Web site, what happens with the following error "there was a problem sending the command to the program". The requested site is loaded after that. without any problem.

  If a shortcut is used while Firefox is already open the error will not occur.

  For me, the problem was the FoxClock extension. Once I disabled it, the problem was gone.

  Hope this helps.

  Olivier

• Why 'Read a fixed number of samples' help with the error 200279?

  Hello world

  It is a question about a tip found in the explanations on the acquisition of data error-200279. This explanation it is said: '... ". reading a fixed number of samples instead of all available samples can fix this... »

  AFAIK the DAQ system buffer is a ring buffer, so we can consider having a writing position and a position of reading "in motion" along the ring. While the playback position is the position of writing, everything is brilliant. But if writing catch up reading, samples will be overwritten and therefore-> error-200279.

  So here's my question:

  I do not understand why a fixed amount of reading samples would help me with this error. I don't understand why other Councils (increase in the size of the buffer or the frequency of reading) would help me because they reduce the probability of the playback position being outrunned by the position of the writing.

  But if I read everything which is available, whenever I read the only way for the buffer fills would be that the time between two readings take more time than necessary fill the entire buffer.

  Or in other words to each reading I will read at least as many elements that it has been filled by writing since the last read, so the only way to fill the buffer would fill completely at once since the last reading.

  This should be a lot safer than reading a fixed amount, because in this case, I'd get a problem if I read it that fewer items than writing complete at the same time, regardless of the number of items that would be and no matter what the size of the size of the buffer that would be.

  What I understand here?

  Thanks and regards,

  Sebastian

  SBach wrote: this VI is a State Machine in queue, the reading part is made in the case of timeout and cases are used as initialization orders, stop and change the outside DAQ hardware.

  That I can't tell when these commands will trigger the time between two readings could not be set. If a strictly fixed amount of data could lead to a buffer to fill.

  Init command: you certainly don't have a running task.

  Stop: You stop the task, then doing here if you get overrun.

  Edit tasks: you will probably need to stop the task still before you can edit the task, but let's go back to not caring.

  The way I see it, the other commands must stop the task anyway.  If you can leave the timeout do its job and do not do a lot of extra stuff.

  And here are some alternatives:

  1. use a shift register to keep track of how long your wait time should be.  In the case of reading, make the deadline to be whatever it is that you are using.  In all other cases, only the 0 so that a read timeout must be performed immediately (once the queue is empty).

  2. When you do your check to 1.5 times the timeout, if there is too much data, queue a reading at the front of the queue so that playback will happen.  The idea is that you really want to keep the same stack sizes to keep the memory to be allocated.  So just to be read more often.

• What is the best way to check if the trigger was held

  What is the fastest way to check if the trigger was held. Right now, the only way I can think is to query the number of samples acquired on the AI channel (which is triggered). Is there a faster way? Is there a property node (that I can't find) that returns TRUE/FALSE?

  Thank you

  Can you elaborate a bit more? What type of trip (I guess a start trigger)? What equipment? What do you mean by 'faster '?

  There is no property to "has a start trigger has occurred." If you want to find if a start trigger has occurred, you can he deduct the number of samples. There are several approaches you can take:

  * DAQmx Read will hang until a timeout is hit or up to the number of samples you request is read. You could do a DAQmx Read with a timeout-infinity (1), playback of a single sample.

  * Well, you could ask about properties DAQmx Read TotalSampPerChanAcquired or AvailSampPerChan; Once they no longer means 0, while this NEITHER-DAQmx started buffering data internally, which means that the material received the trigger.

  * If you use a digital border start trigger and according to your material, then you may be able to use the detection of changes in a separate task, but I don't know if it would be significantly faster then the other two approaches.

• Error-200524 occurred at .vi:2 DAQmx Write (analog 1-d NChan DBL 1Samp)

  I'm trying to generate a signal to usb-6009 of simulated signal.

  However, he keep poping errors:

  Error-200524 occurred at .vi:2 DAQmx Write (analog 1-d NChan DBL 1Samp) if I choose "1 sample on request" in mx data acquisition.

  If I have chaged to "continuous sample", the error has become

  Error-200077 during the property Node DAQmx Timing (arg) 1 DAQmx Timing (sample clock) .vi:3-> 1.vi:Instance:0:1-> Untitled 1 Untitled. VI

  Can someone could take care of my problem?

  Very appreciate

  The limitations of the analog output of your device is documented in the manual and has been considered on several occasions. Because it supports at the time of the application, you can only pass a single value to a moment, not a waveform. The timing is only the software and you can not generate a signal without a lot of jitter and the max frequency will be by the spec.

• matter of timing gives error-200279

  Hey

  I'll have some problems in my program on the schedule and read. The question arises with the part of my code, relating to a barometer Vaisala PTB - 110. (in addition, the program is related to 4 x Rotronic HF5 transmitters and 3 x Brooks MFC). It worked fine for months with samples available by alternating channel between 0 and 1, but now he just continues to rise before giving the error 200279.

  The intention is to have snack every second. I tried to play use 'samples available' for the 'number of samples', but this translates each other read value is 0. I also tried to set the number of samples to read 2 but this messes with my Save function, which is built to collect time-based.

  The problem has left me speechless because nothing has been changed compared to when it worked fine.

  The section of the code dealing with the PTB-110 is included.

  I hope someone can help me understand what is wrong. If it is necessary to understand this out made me know.

  Thanks in advance

  Morten Tschiskale

  Not sure I understand what you try to do, but...

  Looks like you're creating a continuous sample with a sampling frequency of x ms/sample (for example 500 ms).  Then feed you the 500ms in all loop and I guess off the screen is a wait function.  In other words, the while loop will iterate to slightly more than 500 ms/iteration (assuming that there is nothing slower inside the loop) and check back to see if there is a sample ready.  This means that the apparent read rate is slightly slower than the sampling frequency and the # available creep indefinitely. If something is much slower inside the loop (for example, something takes 750ms to run) you're problem will worsen.  I would like to try out a millisecond timer reading to an output of indexation of the while loop to see what really is your loop rates.

  Seems strange that you're using "Channel N, N sample" and immediately the indexing on the first sample of the first waveform.  No further comment other than seems weird.

  If you can tolerate a little jig in the calendar of your reading, you could try a single reading (1 channel, 1 reading, don't not continuous) inside the while loop (or better still within a dedicated loop parllel) and finish with the clock sampling and stuff of readings available.

• Error-200279 with PCIe-6363

  I currently have a simple vi used to acquire data of tension through the DAQ assistant permanently.

  Currently I'm collecting 2 channels sampled at 200 k continuous (due to random events).

  No matter where I put the samples to read, I have several times: error-200279.

  Some other posts, I assume it's because the DAQmx read function and the function "write on a file" are producing at different speeds, causing a shift of data may be.

  To resolve this problem, should I apply the design of producer/consumer model? And if so, I may receive advice on how to actually that implement with my current vi?

  -Matt

  Hi davd24,

  We always recommend to file i/o functions in a separate loop of read/write functions DAQmx. It resembles what is past in your case, is that the time it takes to write to a file is longer that it takes to fill the device aboard the buffer that throws the error you see. Therefore, I suggest the architecture of the producer consumer. Here is a link to a tutorial:

  http://www.NI.com/white-paper/3023/en/

  Also, here is a link to an example of Community produce consumer with DAQmx features:

  https://decibel.NI.com/content/docs/doc-2431

  If you have any specific followed after looking through these questions let me know.

• error-200279 DAQmx

  Hello

  I read 3 data channels in a chart at a speed of 512 Hz waveform, and my table of waveform seems to slow down over time and eventually stops working, then I get the error 200279?

  ReadSamples.vi
  Property: RelativeTo
  Value: Current playback position
  Property: Offset
  Value: 0

  The task name: AnalogInput

  

  

  I use a structure of master/slave of Manager messages and in my master is the 'reading samples' longer vi which reads 4 samples at a time, when I display 1 channel works OK, but the channels I slow display it gets...?

  Best regards

  Thijs

  Looks like you found a buffer overflow... You are not fast enough reading data in your application.

  http://digital.NI.com/public.nsf/allkb/AB7D4CA85967804586257380006F0E62