Writing data to a file of several functions of reminders.

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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.

• 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.

• 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

• storage, reading and writing data to the file

  Hello world

  I am new to the Labview and his community.  Asked me to acquire data on the measurement of the pressure using Labview.  I could build the code and got it working, but when I look at my data that has been collected, there no stopping point.  I just spent a lot of time looking at the data in the place where it begins and where it ends.  The question I ask is how to create a code to read the pressure, storage, in memory until there finishes, collect data and then to write in a .csv file.

  I use the NI USB-6009 case and hook upwards to ai0 and ai4.  See the attached code so uncertain.

  I want to record 100 data points and the system stops after these collection.

  Thank you

  John H.

  You have a certain time which means your VI will continue to run until you press your button to stop the loop.

  The DAQ Assistant is already set to 100 samples.

  Just delete the while loop!

• writing data to the file of measure

  Hi all

  I'm trying record rpm with an encoder in quadrature (200 ppm) in a LVM file with a timestamp of each saved value. It seems to work, except that it registers more values in the file LVM I want. I put the DAQ Assistant to save read 1 sample at a frequency of 1 Hz. However, when I open the file LVM generated by writing custom file Express VI, sometimes I get 42 values per second, sometimes I get 13 and so on. If I don't get a constant number of measurements per second. How can I specify just measure of folder 1 per second, or 5 measures and so on?

  I'm using LabVIEW 2011. The encoder values be read as a frequency and then converted in rpm. Thank you! Files and images attached.

  Your Express VI is not configured to play at 1 Hz. The synchronization method is the default value, which is used for the reading of the frequency as you do. This basically means you're sampling on the rising edge of the input signal, then you're really sampling rate at the same rate as your frequency.

  To do what you want, you can change to mode 1 sample (on request) and add a 1000ms waiting your loop.

• Problem writing data to the file that is inside the SD card.

  Hello

  I am trying to write the data to a text file that was inside the SD card in my application.

  Everything worked well. If once I connect my camera to the PC via a USB port, then unplug the unit that also data are not added to the file system. Please can someone help me solve this problem.

  Thank you

  Schott Perfecto

  1 single source can access both microSD card.  So if the BlackBerry Smartphone is connected to a PC and mass storage mode, your application will not be able to access the microSD card.  Mass storage mode allows your PC watch the microSD as a drive on your PC.  It is configurable in the Options of the device.  You can set it to on, off or invites.

• 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.

• Writing data in the text file or excel spreadsheet

  Hello

  I have a silly question to ask questions about the writing of data in a text file or a spreadsheet. I have an example that simulates a sine-swept DAQmx. The output it provides is the (amplitude and phase) frequency response function that is plotted on a graph (see VI) attached. I like to use these data for further analysis by transmitting the data to a text file or a spreadsheet. I've tried a few things, but the thread is broken. I guess I use the sink badly - so I was wondering, can you please advise me on what sink should I use?

  Your help would be very appreciated,

  Thank you very much

  REDA

  The wire is broken, because you cannot connect this type of data to one of these two functions. The data source type is a table 1 d of the clusters, where each cluster contains two tables. The text file write accepts strings, not clusters. Writing on a file action accepts dynamic data, and while you can convert dynamic data tables, there is no built-in mechanism to convert a table 1 d of the clusters of two matrices.

  What you need to do is to convert the data in a format which can be accepted by these functions. Since you want to have a "spreadsheet" file then you should use writing to the spreadsheet file that creates a delimited text file. Since the frequency data would be the same for the plot of the magnitude and phase diagrams, you can have 3 columns: frequency, amplitude, and phase. You can take off the items using Unbundle by name, and then create a table 2D of each element of the cluster. The real question is to know if you want to save the data at each iteration and if you simply add on the file. The attached figure shows write an initial header and then adding just streaming the data.

• Writing data to extend the acquisition of data for the sampling rate high file

  These are the tasks that I have to do to take noise measurements:

  (1) take continuous data to USB 6281 Office, in a sample of 500 k (50 k samples at a time) rate.

  (2) save data continuously for 3 to 6 hours in any file (any format is OK but I need to save in a series of files rather than the single file). I want to start writing again file after every 2 min.

  I enclose my VI and pictures of my setup of the task. I can measure and write data to the file continuously for 15 minutes. After that, I see these errors:

  (1) acquisition of equipment can't keep up with the software (something like that, also with a proposal to increase the size of the buffer...)

  (2) memory is full.

  Please help make my VI effective and correct. I suggest to remove him "write in the action file" loop of consumption because it takes a long time to open and close a file in a loop. You can suggest me to open the file outside the loop and write inside the loop. But I want to save my data in the new file, after every 2 min or some samples. If this can be done efficiently without using Scripture in the measurement file then please let me know.

  Thank you in advance.

  This example here is for a single file and a channel, you should be able to loop over that automatically. The background commentary should be the name of the channel, no group namede the name of the channel in the control.

  

• TDMS file creates several tabs data. You want to create only one.

  Hello NOR community,

  I am currently using the DAQ Assistant with my pots of chain record travel over a long time interval (see annex VI). I then use the vi "Write to a file as" to save the data in a file TDMS (see 'Write the file settings' photo attached for all the parameters chosen for the writing of the file). The file is written, however when I open the PDM file, the document creates a tab in Excel for every second of recorded data (please see attachment ""). It seems that the TDMS file is grouping all data every second, and then by creating a new group of data.

  How can I get the file to write all data on a single tab instead of creating multiple? I don't want to concatenate hundreds of tabs in a single great sheet.

  Thank you

  Chris

  You should not use the comment.  I just removed who and everything worked for me.

• Reading/writing data to files in the directory "data" of the application

  I'm trying to write and then read a little data, and it does not work. The size of the file is back by '0' because I wrote the file:

  char* ptr = NULL;
  write_file("./data/test.txt", "testing!");
  read_file("./data/test.txt", &ptr);
  fprintf(stderr, "HERE: %s\n", ptr);
  
  void write_file(char* file_name, char* data)
  {
      FILE* file = fopen(file_name, "w");
  
      if (file == NULL)
      {
          fprintf(stderr, "Cannot write to file: %s\n", file_name);
      }
      else
      {
          fprintf(file, data);
      }
  
      close(file);
  }
  
  int read_file(char* file_name, char** data)
  {
      FILE* file = fopen(file_name, "r");
  
      if (file == NULL)
      {
          fprintf(stderr, "Cannot read from file: %s\n", file_name);
  
      }
      else
      {
          struct stat st;
          int rc = stat(file_name, &st);
  
          if (rc)
          {
              return -1;
          }
  
          long num_bytes = st.st_size;
  
          *data = malloc(num_bytes + 1);
  
          fread(*data, 1, num_bytes, file);
  
          (*data)[num_bytes] = NULL;
      }
  
      close(file);
  
      return 0;
  }
  

  Don't know what I'm doing wrong here...

  No idea, but a few tips:

  • Have you created the directory data?
  • Put an exit if the entry is successful, so you can be sure that your code is executed
  • Close the file only if opened successfully
  • Close the file with fclose. Close may not do and cause it is not emptied, the content can be empty. See http://www.cplusplus.com/reference/clibrary/cstdio/fopen/
  • Add a fflush (normally not used) after writing

• faced with the question when writing data to a flat file with UTL_FILE.

  Hi gurus,
  
  We have a procedure that writes the data from the table to a flat file. RAC is implemented on this database.
  While writing data if the current instance, this procedure creates two copies of the data in parts.
  
  Any body can help me to solve this problem.
  
  Thanks in advance...

  I also asked this question, but it seems no final solution...

  In any case, here are two possibilities
  (1) the directory for the file among all nodes share
  (2) run you a procedure on a specific node

• Windows Media Player 11 Date added function - please stop repeating the date for EACH file.

  I have been using Media Player 9, decided to upgrade to Windows Media Player 11, and the only thing I can not stand on Player 11 is how it sorts Date added media files.  In Player 9 when I chose the column Date added, the program would list all the files on a given under a SINGLE date.  With Windows Media Player 11 it lists EACH file with a date so that instead of see Tuesday, December 14, 2010 once and then listing all of the files under it, I see Tuesday, December 14, 2010 about twenty times.  I download podcasts once a week and dump it on my phone, but it's a worry now.  Is it possible to stop Windows Media Player 11 to repeat the date again and again and force him to the date that the list only once?  Think back to Player 9.  Alex

  Hi Alex103,

  It's design in Windows media player 11 and it is also included in Windows Media player 12.

  However, you can uncheck this option, follow the steps below:

  a. open windows Media player

  b. right-click on one of the sorted column

  c. click Choose column

  d. uncheck data added

  With regard to:

  Samhrutha G S - Microsoft technical support.

  Visit our Microsoft answers feedback Forum and let us know what you think.

• Problem writing data analog and entry of informed

  Hi, I created a labview program that acquires 3 analog inputs (2 current and 1 tension), encoder out of whack angle and 4 temporary sensors. The Analogue inputs record against lunatics of an engine angle, once the engine has reached the point dead high simulateously in a single file. In another temperature record since signals file they are a lower sampling rate. Both files at the same time record by using the structure of flat sequence to the duration of the pulse encoder TDC events. The program works well with simultaneous recording.

  However, I believe that in the file of analog inputs, the current readings are by crank angle but channel voltage readings are not. There a lot of zeroes inbetween pressure readings as if DAQ is not intervene for the tension. I can't understand why my program does that because the analog all the readings are in the same time of the sample and analog read the task.

  I tried a program separate labview using only express DAQ and have the same 3 channels and saves the data in a file of lvm - it works even at the same pace. I do not wish to use Express functions in my program since fast flow and writing, he will miss values due to the explicit functions opening and closing of files (explicit writable) and creating the same physical channel (in daq express).

  Please can someone help?

  I have attached my program and a sample file entry.

  Thank you very much

  Notay

  I think your problem is that you are indexing column 2 for voltage instead of rank 2. That's why you have only three elements in this table in the cluster.