DAQmx shown writing as broken, carefully read

Similar Questions

• I imported a SVG in muse.  She builds and presents in preview.  However, once published, the graphics are shown as a broken link.  What I am doing wrong?

  I imported a SVG in muse.  She builds and presents in preview.  However, once published, the graphics are shown as a broken link.  What I am doing wrong?

  When you save your SVG chart, be sure to check the option to embed images. Otherwise, images will appear in the SVG as a link to a separate file and link-outs when you download the SVG.

• Error-50352 to DAQmx analog writing

  Hello

  I get the following error message when you try to write data points about 20 million to a Council of PXI - 6713:

  Error-50352 occurred at DAQmx Write (Wfm Analog 1Chan NSamp) .vi:1

  Possible reasons:

  The requested memory could not be allocated.

  Task name: _unnamedTask<1>

  I don't understand the error memory. When this happens, use LabVIEW is, according to the Task Manager Windows, only 750 MB of memory, perhaps 950 MB max, and I ran things successfully when LV was used 1.6 GB of memory.  I have increased my settings of virtual memory to 3 GB for Windows Vista 32-bit. I have 4 GB of memory total, and I have a core duo 1.8 Mhz CPU.

  My VI is attached. I read in a waveform of singles, do a conversion in rooms double and try to write to the Commission. I use DAQmx calendar sample clock instead of "Using the waveform", because using the sample clock results in one less copy of the data. I read the data in singles because that is how I write in advance, and it is much faster to read in simple it is double.

  Is this something that will have to be split into several Scriptures? If so, how does that affect performance? I have a very limited time)<1s) to="" write="" this="" data="">

  Thanks for any help and please let me know if I need to provide more details.

  Hi Djaunl,

  I ran your program with a DDHN file that I created and got the same error your saw.  I then ran the program with highest point running on - the light bulb it the top of the block diagram. I found that the error occurs on the second loop.  This leads me to believe that it was something to do with the implementation of the task.  When I replaced the clear DAQmx with DAQmx stop and this solved the problem.  The reason that this solves the problem, it is the DAQmx clear clears the task each time that the loop runs, thus freeing up your calendar information.  Whe you switch to stop DAQmx, task configuration information are not totally clear and the error is resolved.

• Property node "DAQmx system" global channel does not read changed MAX global channel of data after the 1st round

  I use the property system DAQmx node to read all the data the scale for global for thermocouple in MAX I use MAX 4.4, LV7.1.1, with a SCXI chassis in a PXI-1050 chassis. It seems to read the properties very well on first run. However, if you then change a channel property overall Max (for example a ladder or a type thermocouple factor) and it saves to the MAX, and then runs again the property node, it still read old data Max. To get it to read the changed data, it must close the VI, and then reopen it. It's painful when you recalibrate a vast set of thermocouples using MAX.

  Is it possible to force the node of system DAQmx property to reread MAX whenever it is executed, without closing his VI?

  See attachment. Run called standalone VI... PRINCIPAL. See instructions on the VI.

  Thank you

  Tim

  Hi Tim,.

  Your main VI has not been updated is because you do not clearly the task after every time you call the DAQmx property node.

  Attached is a modified version of your code that works. I just added the Task.vi clear DAQmx in the FindChanProps.vi.

  Best regards

  Faris has

• 6036E PCMCIA + DAQmx (analog input) seems to only read in blocks of 512 samples of data

  Hello people,

  I ask this question before I post any code or software versions etc to see if there is a simple answer.

  I use a PCMCIA card 6036E to read an analog input channel (DAQmx... i. e create task, create the channel, set the altimeter (continuous samples), task, read in a programmed software loop while (ASAP)).  No matter how I put my sample rate, number of samples per channel (i.e. size of buffer), or the number of samples to be read, it looks like I can get multiples of 512 samples.

  Here are some samples freq (Fs), the 'number of samples to read' asked and the actual number of samples read:

  FS numberOfSamplesRequested numberOfSamplesActuallyRead

  200Hz   20                                                 512

  1000 1024 5000Hz

  2000 2048 5000Hz

  QUESTIONS RELATING TO THE:

  1 is this 'normal' behavior a 6036E PCMCIA card?

  2. in the case, has anyone who may have seen this problem determined the cause and how to "fix it"?

  Best regards

  Chris

  chassan wrote:

  Hello people,

  QUESTIONS RELATING TO THE:

  1 is this 'normal' behavior a 6036E PCMCIA card?

  Sort of.

  2. in the case, has anyone who may have seen this problem determined the cause and how to "fix it"?

  Best regards

  Chris

  Systems PCI DMA is used to transfer
  the data, daqmx and receive messages when the number of samples are
  acquis. Now on PC-card that does not work and the data is transferred
  When the edge buffer is full (after 2 k of data) to 2 channels
  10 Hz, it can take some time.
  There is a work-around, there is a property where you can set the transfer mechanism (I have not daqmx on this PC), or the daqmx polling mechanism. Try these.

  Found a document KB.

  Tone

• Search for broken Adobe Reader? [Android]

  when I search a word on my adobe reader software, it calls for the Word isn't here. im reading a pdf file and I used to be able to search for words in a PDF file on my mobile adobe reader app, but now he's going to say every word I am looking for is not found. is it broken?

  Hello

  This problem has been fixed in our latest update. Could you please update the Adobe Reader application and confirm that it works well for you now?

  Thank you

  Adobe Acrobat team

• DAQmx generating triggers TTL and triggered read it

  I am running LabVIEW 2013 on a Windows 7 PC and I use a card PCI-6251 DAQ with a BNC-2110.

  For my application, I need to generate triggers TTL (for example, with a frequency of 1 Hz). At the same time, I need to run data to HAVE which is triggered by the same TTL signal.

  So far I managed to implement the TTL square signal properly with a spot of meter output - I can see the triggers on a scope. I also have a task of entry of HAVE and included a digital triggering. He works in part, and I have a few questions:

  • The physical channel of triggering TTL is set to ctr0. This seems to be associated with the PFI12. I rather would specify the terminals directly in my program - is it possible? The ctr0 is not labeled directly on the BNC-2110.
  • The task of IT is triggered by the PFI0. I connect a cable from PFI12 to PFI0. Is this really necessary? The task of the AI can be triggered internally for the same counter? My external hardware must be triggered with the same signal as the acquisition. So far, my solution seems to be the only way I can make it work.
  • Digital triggering for the task to HAVE it is configured to 'rising edge' trigger. However, when I run the task to HAVE it continuously in a loop, it seems that it is triggered Alternatively edge bearish and bullish. I checked this by connecting the meter to exit on PFI12 directly to the input string for the task to HAVE it, and I observe that the periodic square wave changes sign. Why is this? It is a problem for my application - I need to be able to always trigger on this same Board.

  Thank you very much for your help.

  hmalissa:

  You can query programmatically for the pulse of a task of the meter output terminal using a property DAQmx channel node.  Here is an excerpt.  Just save the image and drag the file into a LabVIEW block diagrom and turns it into code.   You do not have to use this as a Subvi, controls & indicators are just there to identify the task who is who.

  

  Bob: interesting experience.  But to help future readers to draw the erroneous conclusion, I just would insist that a timed hardware task still * fact * produce much more repeatable calendar timed sample a software task programmed in a software loop.  Example of Bob is not address the regularity of the individual sample interval, just by comparing the driver DAQmx or MS Windows timer is more sensitive (and repeatable) to marking the end of an interval of 1000 msec.

  -Kevin P

• Citadel question - writing numbers and then read back slightly different numbers?

  
  

  Hi Matty,.

  Thank you for these demonstration programs, it really helps with debugging.  First of all, the Hex 0x8ABC1003 error occurs because at the end of the program, you do not have the sons of the error to Trace List.vi wired to read Trace.vi, so they're trying to run at the same time.

  Secondly, the reason why you see the different values that those you write must make with the accuracy of the database. If you notice the Open Trace VI has an entry titled 'precision', that if nothing is connected to it, is by default 0.01. If you want to store values uncompressed, wire in a value of 0. You will notice while the read data are exactly what you enter, as in the debug.vi updated the joint.

  Kind regards

  Elizabeth K.

  National Instruments | Sales engineer | www.NI.com/support

• Environment variable folder is different when it is shown in the console and read by programs

  Hi all

  On our Windows Server 2008 machine, the TEMP and TMP environment variables all point to C:\Users\\AppData\Local\Temp as seen in system properties. However, they appear like C:\Users\\AppData\Local\Temp\3 in Windows console command line. I also feel the same behavior in Windows Vista. This causes problems in our program. I don't know whence the '3' subdirectory and why these environment variable appear differently in the console.

  You have an idea about this problem? Thank you very much in advance!

  Lini

  http://www.Microsoft.com/windowsserver2008/en/us/community.aspx

  http://www.Microsoft.com/windowsserver2008/en/us/forums-blogs.aspx

  Server 2008 Forums at the link above.

  See you soon. Mick Murphy - Microsoft partner

• USB6363 DAQmx (reading and writing) calendar seems slower than other similar USB DAQ devices

  Hey people,

  I have currently a service waiting number with OR the subject, but I thought I'd post up incase anyone has ever dealt with a similar question pertaining to USB DAQ hardware.

  Try to understand why there is a difference of synchronization between the 6363 USB and some of the other less expensive USB devices like the 6525 or 6501.

  

  It's a watered the actual code that my team has noticed this difference in the simplified version.  The actual code is a reading analog daqmx (it's triggered hw, so we begin the task of analog playback, trigger, wait the time we acquire to and then run reading daqmx. who takes 6 ms to read a single 50 values of the buffer).

  Thank you

  -Pat

  Hi Pat,

  Try benchmarking of HAVE it read that way (with the wait timed by the software, it seems to me that the task is probably not yet made to the time you want to read - I guess that the question is relative between the event of the task performed and all the data is available in the DAQmx buffer, I don't have a series of X USB to see) :

  

  Try benchmarking your writing clocked by the software in this way (there no reason to include the check/reserve/validation/start sequence in your writing of reference when the task can easily be launched during initialization of your program):

  

  On my PCIe X Series as the two cases take< 1="">

  Best regards

• How .vi DAQmx Read (analog 2D NChan DBL NSamp) to acquire continuous data?

  I try to get the .vi DAQmx Read (analog 2D NChan DBL NSamp) to acquire data continuously.  The 'help' indicates I need to wire the number of samples per channel-1, but it doesn't seem to work for my application.  If I have the wiring to any number greater than 0, the data collection works, but is not continuous.  I enclose the code (Sept15_MainPanel_WorkingBaselines_ApplyBaselines and Calibration.vi) and a Subvi (Collect_Baselines.vi) if someone wants to take a look.

  Here's what I'm trying to do:

  I use a unit NI USB-6009 to collect analog voltages of load cells 2 (channel 0 and channel 1) and 2 displacement transducers (channel 2 and 3).  The main panel of the VI contains a listbox with 4 options - 'Check EMG channel', "Collect base lines," "Collect Data" and "end of program".  'Collect base lines' 'End of program' work and I'm working on writing code to "Collect data".

  For the option "Basic collection", 2500 samples are read from 4 channels described above and 2500 samples are averaged.  This works.

  The option "Data collection" - I would like to that data from 4 channels to acquire permanently.  Finally, for the option of data collection, data acquisition stops when channel 0 detects the force of 200 N - so I will not always have a finite number of samples read.  The time it takes to reach the value of this force will be different for each test.

  -How can I get continuous samples for my 4 channel?  Is .vi DAQmx Read (analog 2D NChan DBL NSamp) function badly and if yes, what should I use?

  Thanks in advance for any ideas or advice.

  Esther

  First, in case 1, you need not the structure of flat sequence.  The son of the error and data properly will dictate the flow of execution.  Then, in State 2, you must initialize the shift register, unless you want to keep the data is accumulated each time that you run the vi.  The reason why you don't see all the data here is because you have - 1 wired for the number of samples per input channel.  You must connect a number here, even if you are taking continuous samples.  The service needs to know how much sample to gather at one time.  If you put-1 here, the number of samples per channel must be set up in the synchronization function DAQmx (sample clock).  If you specify a number here, then you put-1 in playback function.  The DAQ hardware will read continuously, you must retrieve the data from time to time, so you must specify the number of samples.  By reading inside a loop, it will continue to read until the stop function is encountered.  I guess that the Clear function acts as a stop.  But you must always indicate playback vi how many samples to read and return on each iteration of the loop.

  The documentation is a little misleading.  He warns that a - 1 will cause a continuous reading.  But the pads are so big, he can not read continuously forever without losing data.  If you specify a finite number, playback in a loop, and he will read this number and return the data (empty the internal buffer) at each iteration of the loop.  Continuous means that you just call the start function once.  He will read at each iteration of the loop until the stop function (or clear) is called.

  Here is the difference between the setting of the Timing DAQmx function for continuous or finished reading: finite samples requires a tenure, he reads the finite number of samples, and it's done.  It requires another start to read more data.  Continues to read requires only a start.  It still reads a finite number of samples, but when this is done, you can retrieve the data by calling the read function until he could continue.  After the reading, you don't have to call for new start.  Look at it this way.  Start is what starts the collection of data, not the read function.  Just read empty buffers in your data feed.  The data acquisition continues in continuous mode, but you must call read again to get the data on the pads.  If you specify basically buffer size when you set the number of samples per channel.

• DAQmx newspaper read and data at different speeds

  Hey guys!

  I use DAQmx to make playback of analog input.  I would like the data be datalogged by TDMS at 1000 Hz.  However, I want to only read data at 10 Hz.  Is there a preferred method to do?  The photo below shows what I have so far.  (Note that this image is a simplification of the routine I use DAQmx)

  

  As you can see, I put the sample clock at 1000 Hz.  This forces TDMS datalogging at 1000 Hz.  Then I have a while loop that runs at 10 Hz with a read operation inside DAQmx.  For the moment, I have to read all THE data buffer at each iteration of the loop.  However, I am only interested in reading 1 sample of each channel for each iteration of the loop.  (I finally take this sample 1/channel at 10 Hz and push it into a plot for the Viewer)

  Is there a way to read only the latest data for each channel and then to clear the buffer, such that I don't get a buffer overrun error when DAQmx see that I have not read all the data?  It seems inefficient to me and read all the data indexing, then only on the first column.  Am I missing something, or is this method very well?

  Thanks for the thoughts!

  I would probably just go out of the wait function, read 100 samples per loop explicitly and index on the last sample for display on your screen (or 100 samples on average).

  Alternatively, setting the following read properties before starting the task should work for most devices (if not, please let us know you are using):

  

  Best regards

• I can't stop finite samples daqmx read between the two?

  Hi all

  I want to read data from 10 seconds to a trigger is received. for this im using daqmx task finished sample mode and read the data on the trigger getting. It works fine but I can't stop my vi between the two when its reading of the data. I have to wait for it to complete the reading of values, and then stop the vi.

  so I switched to continuous sampling mode that allowed me to stop the vi whenever I want.

  I just want to know is there any means or the property using which I can stop my task over daqmx read when I want?

  I guess you call DAQmx Read with extraordinary value (-1) for samples of #.  It is also the default if left thread continues.  In a finished sample task, it means to wait until the memory full buffer has been filled with samples before returning.  Once you make that call, you cannot directly finish soon.  You're stuck waiting for buffer fill or for the timeout expires (default 10 seconds).

  One way to avoid getting stuck is not to ask for samples that do not exist already.  You can query a DAQmx Read property, known as the "Samples available" or something like that and son of this result in a call to DAQmx Read.  Such a call will return immediately whatever data are currently available.  Subsequent calls will give you samples.

  -Kevin P

• 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.

• Error usb-6212 "reading port.vi digital" reading: Subvi is missing

  Hello

  I try to have the LabVIEW to recognize my USB but I got the error "digital port.vi read" is missing. I was wondering if there was a resouce for sample VI? Or how to write a VI in order to recognize/read the digital signals of e/s?

  Thank you very much!

  Hi blizabeth37.

  If I understand you correctly, you are looking for e.g. screws, correct?  Have you tried looking at the example Finder LabVIEW?  Examples in LabVIEW, click Help.  "Once in the Finder of the example, for digital i/o, obtained material input and output" DAQmx "digital generation or numerical measures.  Carefully read these files, and you should find something that does what you want.

  Alternatively, you can go to the online community to find, for example, code: www.ni.com/community

  I hope this is what you were asking.  Good luck with your application!