Loss of data on a file writing

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• Writing data to the file when the trigger is activated?

  Hi all

  I'm quite new in lab mode, and I find it difficult to find a solution to this problem quite simple. I installed a gauge on a tank, and each time, he reached the limit of overflow of the VI should write all data to a file. I implemented my data tables, but I am struggling to find a way to have the VI writing the data when the specific trigger (the tank overflow) occurs. I'm sure the solution is quite simple, but was faced with this during a few days now so I decided to ask for help.

  See you soon,.

  Gasim

  Gasim wrote:

  Seems to work, but the program stops when the trigger activates and asks you a file name to write on and then reset the whole process. Is that anyway so he can write the data automatically, without any interruptions?

  Yes, simply son by the name of desired file in VI of file write. If a cable it won't entice.

• trigger data acquisition on a file writing

  I have trouble getting my DAQ to write data to a file based on an external analog input.  The challenge is that the analog input signal is only about 1 ms long and I use an old NI 9172 cDAQ.  The analog input is not very active, so I want the program to write to the file when the voltage is 5V in<>

  I can see the trigger fires when I run the program at all times, but it's not write to the file.

  Any help would be greatly appreciated

  I think that I thought about it.  Or at least I did something that works now.  I added the function of 'Max and Min for the table' which allows me to only read the minutes of the data and allow to compare then to writing.

• Toshiba satellite which is stuck in the installation of service Pack 1. I have service pack 2, can not fix with this cd, can I install service Pack 2 on it without loss of data or files?

  I have the laptop (Toshiba satellite) friend who's stuck in the installation of the service Pack 1.  I have service pack 2 and am wondering, since I can't fix with this cd, can I install service Pack 2 on it without loss of data or files?

  PC claims service pack1 cd with file asms

  When you use service pack 2 cd can not load product catalogues, it is fatal error, the Setup logs files should contain more information.

  Why not integrate Service Pack 2 and Service Pack 3 on her XP CD by following the instructions here (using another PC):

  http://en.community.Dell.com/support-forums/software-OS/w/microsoft_os/1443.aspx
  Copy all data on an external hard drive, do a clean install using the XP CD updated (preferably on the BIOs)
  Then, install the drivers from the system, then Microsoft Security Essentials, Windows 7 Firewall Control (XP free Version) and Malwarebytes' AntiMalware (free or Pro) or whatever you prefer security.
  Then copy the files over.
  This will probably lead to the best performance.

• . Files NEF (Nikon D600) in Camera Raw (bridge CC) appear extremely saturated to the point of loss of data. When exporting, the images are very good.

  . Files NEF (Nikon D600) in Camera Raw (Adobe CC) appear extremely saturated to the point of loss of data. When exporting, the images are very good. There is no update available.

  As it appears in Camera Raw

  

  Exported

  

  In Bridge, open camera raw preferences and uncheck the option of graphics processor at the bottom of the dialog box.

• Data loss with the opening of files the customer CS6 in the clouds

  Installed all recent updates...

  Files the customer cloud version...

  Opened in CS6 with the Error Message "the file '-' was generated by a newer version of Illustrator.» You want to import this file? Data loss can occur.

  A LOSS OF DATA OCCURRED.

  What is going on?

  Rebuilt all of the relevant files related to the program, Mac OS x 10.7.5 cleaned

  All... always referenced the file opens with missing data (colorful box and setting the white guy in two areas on the product)

  Not good legacy import

  Not good feature in the production

  Not good

  Someone needs to open the file in CC and save in a compatible version of CS6. CS6 can open older versions, without data loss, but not the files of CC.

• Writing data to the file trigger

  Hello

  I'm new to Labview and I'm having difficulty trying to make this work correctly.

  What I do is followed the release of a transducer and when it reaches a certain critical value I want to write data to a file.

  I have this part works fine, but I'm currently using a higher vi / equal to check the value against the flow of the instrument, so when the value is less than the critical it to stop recording.  I want to continue to save for a number of minutes after reaching the critical value.

  How can I do this?

  Look at using the Express VI of elapsed time.  So when the condition is met, it triggers the VI and it will keep logging data until the Express VI shows the elapsed time.

• Writing data to a file of several functions of reminders.

  Hello

  I'm new to LabWindows and I try to save test data in a file where my project directory. I was able to save the data to test the function main cvicallback in result.txt but not the test data of another cvicallback function that were called by the function main cvicallback in result.txt. Can someone tell what I'm doing wrong here? Here's what I have in the main call feature cvi back.

  GetProjectDir (path);
  MakePathname (path, "result.txt", path);
  FID = fopen (path, "a +");

  status is fprintf (fid, 'Test data' or hand CVICallback message);.

  fclose (fid);

  And here's what I have in the other cvicallback who was called by the main function of cvicallbak.

  FID = fopen (path, "a +");

  status = fprintf (DIF. "The data to test the CVICallback another message");

  Thank you

  Yuna

  Yuna:

  Do you get any error messages?

  How is the second function called?  Are you sure it is called?  You can set a breakpoint on one of its lines of code to make sure.

  You must post more code to get the bigger picture.

  Is the overall or is path - this local to your hand?

  If pathname is local, how it is passed to the second function?

  You close the file in your second function?

  I'm guessing that it's just a typo, but the fprintf in the second function shows a period after that IDF and there should be a comma.  You are better to paste the code in your message instead of having to retype.

• Problem in writing data to flat file

  Hello
  
  I created a table as the source interface and the file as a target. My interface has been around for a long time, but it's not write data to the file. Any clue?
  
  -Chikk

  Hello

  Please, take a look if the target file is locked.

  Try to remove and put the 'Truncate' revenge option to yes.

  Cezar

• 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.

• save data in binary file

  Hello

  I have 700 2D double table to save and I would save in 700 different .dat extension (binary) files. I know that I can save a table in a binary format, but using a dialog box that opens a window so that I can choose the file. Since there are 700 table I don't want to have to choose the right way every time.

  I use a dialog box create a folder where I want to save 700 files. For now I earn 700 tables in the text file of 700 different using the "write to the spreadsheet file" VI and I works well, but it creates text files...

  Is it possible to do the same thing but by memorizing the data in the binary file and without using a bow of dialogue for each file?

  Thanks in advance

  Use writing binary vi to write in binary file. http://zone.NI.com/reference/en-XX/help/371361J-01/Glang/write_file/

  You could ask the user to select the folder you make below and then programatically generate paths, something like this:

  

• Loss of data for the network flow

  I have an application where I need a chassis CRIO 9068 stream to a PC, and I'm running into some problems with data loss.

  The CRIO is sampling data, put in a picture 2D tanks (the size depends on the number of channels and the sampling frequency) and it streaming on the PC.  Data loss is not consistent, sometimes no data will be lost. Also the size of the array be listened to believe makes no difference, sometimes I won't lose data 24 channels 25 kech. / s, and sometimes I'll lose data 1-channel 10KS/s.

  The VI (host PC) runs in a non-timed while loop, it runs generally to about 50 Hz, sometimes hiccups system will make it slower for a loop or both.  Wirte CRIO loop runs at 20 Hz.  I think that the loss of data occurs when the PC has an if its hiccups, I know well that the size of the buffer to the stream network could absorb these hiccups.  If I make the size of the buffer is bigger, I seem to have a memory leak and the CRIO crashes after a few minutes.  I have also the CRIO record data directly without streaming, and no data is lost here, so I know its disappear somewhere in the stream.

  I also have a separate Standard TCP connection between for command and control, do not know if this could cause an interfereing with the network flow problem.

  I have attached photos of the screws where the endpoints are creadted and where data is written and read.

  I'm using Labview/RT 2013

  Thank you

  Suggestion of the AGJ is a good thing.  I had trouble keeping your code - there were so many things with wires everywhere...

  I have an application that runs on a PXI-8106 controller streaming 24 channels of data collected at 1 KHz (or 24K s/s).  He gets streaming via network to the host computer and from there flows streaming to disk.  At the same time, I'm streaming "Events" (transitions State, DIO line changes, etc.) to another stream from network to another data file.  A key step is that the data is off the network stream, they are put in a queue for sending the disk.  There are several parallel running loops, and I never lose a sample (I can tell because one of my channels is a "clock", the index of the loop timed running on the PXI system that produces the data that is sent to the host through the network stream - I can inspect this channel and see that each point is different from the previous one by 1).

  Do you use queues to stamp your data in and out of the network stream?

  BS

• Best way to record 50 kech. / s data to the file

  I'm reading a data acquisition data at a sample rate of 50 kech. / s and save it in a file. My application must run for at least a few hours. At first, I tried a model of loop of consumer-producer with a writing on measurement file Express VI, but he wrote the data too slowly, and my queue. Now, I'm trying to use the Write to VI file spreadsheet with or without a loop of producer-consumer model (see attached screws). Both seem to write data to the file, but no written records the number of datapoints I expect (the two have a lot less datapoints).

  What is the best way to write data to the file? Seems like a basic question, so if it has already been discussed in detail in another forum, or if there are examples of what someone could point me to, that would be appreciated also.

  Thank you!

  Hvea look at "stream directly to disk with TDMS in LabVIEW".

• What is the best method to add data to a file stored on a usb flash drive to avoid too many write cycles?

  Hello

  I'm trying to store an important data on a cRIO sampled stream in the USB flash drive.

  I believe that there are two ways to add data to a file:

  1. open the file outside of the loop, then write to the file loop, then close the file outside the loop.

  Pros; More quickly and efficiently than the opening and closing of files in a loop is resource heavy equipment.

  Disadvantages; If the program fails partially through, all data is lost.

  2. open the file, write to the file and close the file, all in the loop.

  With the advantages and disadvantages as opposed to option 1.

  As my cRIO is finally deployed in a hostile environment and data are valuable and processing speed is not an issue of concern in this project, I'm leaning towards option 2, but after a few basic calculations that I realize that I'll be writing/opening/closing the file of thousands of times and I wanted to know if this will wear out the flash memory?

  My uncertainty is due to not understanding what happens when a file is opened written to and closed.  He writes the new data to new areas of the flash, or it write all data on top?  The latter would cause me problems not too long term!

  Any help gratefully received.

  A big thank you and best regards,

  Ed

  The 'magic' is not in the File Format (PDM vs vs binary text), but in the "life" of the file.  This solution creates a file of 24 hours and maintains a different file for each day.  If the USB "dies", you lose everything you have not backed up somewhere.  If the program dies (or errors), you lose the data for the current day.  You end up with multiple files (which can be a more or less), but we must still make the trade-off between (duration) of the file and the file number opens (which relates to your concern for the longevity of the USB).  By the way, I suspect that a good quality USB key (it's what you mean, right?  Or do you mean a hard drive USB powered?  Comments probably apply both) can predict today to not die on you, everything just because you make a lot of reads/writes (of course, you could get in-a-thousand...).

  Bob Schor

• How can I write snapshot of my data to the file measured every 5 seconds

  Hello

  I try to take a snapshot of my stream once every 5 seconds and write it to a. File LVM. I have problems with the VI "write to a measurement file. The pace at which it writes data to the file seems to be dictated by the 'Samples to Read' parameter in the DAQ assistant. I tried placing the VI 'Write in a file measure' within a business structure and the launch of the structure to deal with a "time up" VI. As a result only in a delay of 5 seconds before the insiders 'Write in a file as' VI. Once the VI 'Write in a file as' is launched, it starts writing at 20 x per second. Is there a way to change it or dictate how fast the exicutes VI 'Write in a file measure'?

  My reason for slowing down the write speed are, 1) reduce space occupied by my data file. (2) reduce the cycles of CPU use and disk access.

  The reason why I can't increase the value of 'Samples to Read' in the DAQ Assistant (to match my requirement to write data), it's that my VI will start to Miss events and triggers.

  I don't know I can't be the only person who needs high-frequency data acquisition and low-frequency writing data on the disk? However, I see a straight road to key in before that.

  The equipment I use is a NI USB DAQ 6008, data acquisition analog voltage to 100 Hz.

  Thanks in advance for your help

  See you soon

  Kim

  Dohhh!

  The re - set feature has not been put in time elapsed VI!

  Thank you very much!

  See you soon

  Kim