RT-write to TDMS hourly

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• Executable file do not write in tdm/PDM files.

  Hello

  I wrote a wrapper around a VI that controls the entries to designed the hardware and monitors the outputs for the prolonged lifetime of testing purposes.  We use compact DAQ for control and data acquisition.  We do not wish to moor a LabVIEW license for six months to run the desired test, I compiled an executable and built an installation program.  Everything worked without problems on a PC with LabVIEW and everything seemed to work well on a PC without LabVIEW with the executable... until I decided it was time to start analyzing the outputs recorded (tdms files).  The application is able to not control my material, no problem, I could see it passes through different States and key measures that I display on the user interface are valid, but the log files are simply cannot be created, not even an empty file.  At the lowest level, the open storage VI [TDM] is called to open or create the file (filename is entered by the user or created with timestamp if he did not) and each 'bit' of data is written by writing data [group of channels] and write data [channel] live on the PC with LabVIEW, the output files are created without problem.

  Did not work with executables before.  How can I start to debug (without installing LabVIEW on the PC in question - and when all goes well when run on a computer with LabVIEW installed)?  Have tried to build the executable with active debugging, but do not know how to "enable" debugging or a walk through as in LabVIEW... or if it's even possible...  I don't get warnings or errors during the race.  Is there something special I need to do in the construction of my executable or installer, particularly writing executables TDMS files?

  Thanks in advance

  -Andy

  
  

• TDMS first write delay

  I am trying to broadcast a large amount of data to an FPGA Flexrio/ent before continuous scanning to

  disc HDD-8265 continuously. I use the advanced functions of PDM, preallocating the

  size of the file with the correct sector size, etc. and when I listen 2 G - 50 G samples (u32), it doesn't work

  problem.

  As I increse my sample from 2 G to 50 G size, I noticed that the target-to-Host FIFO through which I send

  My data is beginning to be fiulled upward during the first time I try to write the .tdms file. Once the writing is recommended

  is called it firt time, everything is ok and writing advanced catches up.

  I noticed when I exceed 80G samples of the target-toHost FIFO overflow and I lose events. I'm trying to fix this problem; I need to keep all the events which me providning an absolute timestamp (GPS)

  which is generated by a number fixed events since the start of data acquisition. If I drop the events, I lose my ability to TimeStamp any particular DAQ sample.

  I keep my the same sampling rate through the tests, so it seems that the problem is associated with

  Some are looking kind of time of the first entry in the .tdms file; It seems to stretch and longer

  the file is large, then once that he firt writing it is not a problem.  Once the HDD-8265 starts

  write, there is no problem juggling; It's just kind of initialization time-out that is proprtional to the

  the file size is allocated.

  I'm preallocating space using the advanced features of .tdms and tried to put a wait after this function but

  has no effect on the time of the first entry.

  Is it possible to start the HDD-8265 to get ready to take data without actually writing the events? I guess I could write a dummy block of fixed length, wait a second and then select the data acquisition system, but this seems like a terribly stupid thing to do. I would rather not write dummy data blocks for the HDD-8265 just to get rid of the delay until the disk can fully manage the flow of data cointinuous.

  OK, this definitely helps. If you have a large file, say 1 TB, then you will have to wait a few seconds after the flush before the 8265 is ready to take data. It seems that the reader begins to map the allocation of files after the flush.

  I put a delay time of 5 seconds after the flush, and it seems to work perfectly for a 1 TB file. I suspect 5 TB

  should maybe 10s or more. See the joint .png

  I did not consider that you could mix regular functions and advanced .tdms... Thanks for the help!

• allow to create or write a PDM file with labview 2014

  Hello

  I need help. I'm new with LabView. I tried to create a PDM file, but it does not work. My code in the link below is really simple, but I don't know what the problem is. My code doesn't throw any errors so I don't know what to look for in the internet. Once my code is excuting, no file is created. I use LabView 2014 and my laptoop has windows 7 on it.  My question is, in all I need to do whenever I create a new VI of specific configurations that will be play/create/write a .tdms so that my code may work correctly because the writing in a .txt file works perfectly.

  Thank you and sorry for my English

  Hi bmtanguay,

  you want to run your VI on your cRIO9074?

  Where do you think your cRIO creates this file? A cRIO is a clean computer - and it has its own 'hard drive '. This is where your file is created: C partion on your cRIO!

  You cannot create a file on your Windows pc from a VI running on your cRIO!

• TDMS plugin

  I try to use screw express data storage to write of TDMS files but I get the error-2588 to try to open the file.

  Here:

  http://zone.NI.com/reference/en-XX/help/371361H-01/lverror/storage_error_codes/

  the error code is translated into "Failed to register the use. The use of .uri file may contain information of invalid use. ", but the message box that reports the error says"Labview cannot open the data storage file.

  I (re)? installed the plugin from the site, NOR unsuccessfully. I'm using Labview 2011.

  Any ideas?

  It's the opening and process of creation of the file which was not.

  The VI attached shows the problem, although now, I discovered the reason for this. "Open data storage" VI insists on the .tdms extension is provided in the path while the VI 'TDMS Open' adds the extension itself.

  I still think that the description of the error-2588 code is useless, or the error code is issued wrongly.

• Encrypting data by connecting to tdms files

  Hello

  The project I'm working on that saves its data in tdms files.

  But it is necessary to protect the intellectual property of the data, so that the client wants the encrypted data.

  Does anyone have a suggestion regarding best practices for encrypting the files in data/PDM?

  THX

  Ben Engelen

  TDMS is not a built-in encryption feature. There are several options as to how you can manage encryption.

  1. You could write a TDMS files unencrypted to the disk and encrypt it using a 3rd party software (e.g. PGP).
  2. You can use a file encrypted hard disk, partition or container you write directly the TDMS file (TrueCrypt is a good choice for this).
  3. If you consider the temporary presence of a dangerous unencrypted file, you can also encrypt all the relevant parts of the file (names of properties and vales, raw data) within your application LabVIEW and then write to PDM. Of course, you then have a player application that implements the decryption.

  Hope that helps,

  Herbert

• How to record a FFT in no time fixed

  Hello!

  I'm new to LabView and I work with version 12.0. I developed my VI by search through the internet and using the help option, but now I got to a point where I can not find a solution.

  I'm analyzing a signal, which i Messure continiously with 2 Mhz. (Puffer = 10 000).

  So far, I've saved the FFT by activating the hypothesis of backup through the Boolean operator. This was allowed in order to document the rough behavior of the signal, but I need a continuous record now.

  It would be perfect to make a snapshot of the FFT in no time fixed and save data with time according to in an excel file. In the first place, the result should be something like a matrix that I can use for an additional post-processing.

  I would like to run this VI more likely a few hours and I realized, that too much data is created.

  Is there a possibility to save for example only every 10th point of data or any other way to reduce the amount of data?

  Attached is my attempt so far.

  With greetings

  Hi, Mr. Pete,.

  You are welcome. If you want VI to write to TDMS as shown in your screenshot attached, you can change the code as follows:

  Since for every 'real deal', so we store the data in a column. So what we want to do, is that for each real, we are writing to different column, but with a different as header 1 FFT, FFT 2 and etc. So true as shown below, you must add a counter (we'll call it the column counter) that is incremented every time it's true. Of course, it must initialize the counter of the column outside the while loop so that we start to TFF 1 every time you start the VI. Let's say for the first real trigger of the data storage meter, the meter of the column is equal to 1. However, this counter of the column should be converted to a string, so we use "format in string.vi. So, since one uses a common name, we use FFT at the beginning of the string.vi of conconate. As the results of the conconate string.vi will be 'TNI 1' and data will be stored in a column called "TFF 1". This will be repeated for each increment of counter column (to be noted that this increase count of column occurs only if the case is true).

  

  So given that we do not want this VI writing on the same column continuously while the VI runs continuously. We are to use the shift registers to inherit the value brought from the previous iteration to the next. That means that the column counter will always be 1 until the next 10 data points. So when the iteration of the loop is not equal to 10, the column counter is always at 1 until when the loop iteration is equal to 10 (meaning 10 data point), the box structure is set to true and the column counter is equal to 2 and therefore to store in the column 'FFT 2 '.

  

  If this process continues for the FFT 2 and 3 of the FFT, etc. until you stop the vi.

  

  It will be useful.

  Warm greetings,

  Lennard.C

• can not access my 2 phones from verizon on PC by uploading photo.

  I have a 2 year, HP pavilion slimline computer desk, model # is S5-1224. I improved our Verizon phones recently and told me that the USB cord for the charger could also enter the PC to d/l images. Cool I thought, but it does not work. I'm working my way to my list of USB, and there is a yellow warning triangle with! mark in it. When checking more, it says "device is not available, code 10." I did a google on it and found that the USB driver is likely bad. I've updated until I'm blue in the face and it still shows the driver in 2006! but the construction date is 9-2012! How this can be.

  Anyway, I went to HP and they linked to some "test site" that said, I had 16 drivers 'old or ancient' and of course wanted $29.95 to "solve" the problem. Can't believe that HP has no updated driver but outsources for money. Anyway, when I pull the usb cord, the yellow triangle disappears. I plug my phone 2 days years wifes, Panel yellow returns! Be very sick of this problem. All I want to do is d/l my pictures from my camera to my pc. Does anyone know of a difficulty which only costs $29.95? Just don't have it right now.

  Thank you.

  Mark in Phoenix

  Well, another day has come and gone and I could write for another hour, but won't. Really wish I knew I talked on the phone yesterday at HP. What I ended up doing was moving the USB cable to the BACK of my HP POS computer and guess what? Yep, the USB in my device manager warning flag came out and the LG CDMA USB Modem icon presented in the section "other devices." I finished then setting all the other stuff then got a popup from Verizon saying that LG had an update available for the phone, so I jumped on it. So even if pillar 2 USB front still does not recognize my phone, those back do. Sorry, I mean no one tech on the phone could at least tell people to give it a try when they know that no one is broken, like just about everyone out there the pinhead is perhaps.

  In any case, support of HP, nice work, trying to sell your plan of $227 'service', but rather all do you this, we have P * sing off the coast of what was a loyal user of HP. No more HP for me. Products are so-so at best, and the "customer service" lives up to its name.

  BTW, I'll add this to my Moose to Meg Whitman email I sent yesterday, and which included a copy full of my post above. I hope that you have a good day well!

  Mark in Phoenix

• Does not clear the PDM buffer

  I use TDMS written and PDM rinse functions in a state machine application. I write to TDMS in two States and rinse after every write.

  Worth that I will have is that hunting TDMS takes the time to write data on the disk, but does not seem to fade from the buffer, such as duplicate data following emptying. Interestingly, this happens only for a single State.

  The first State, which has no problem, writes 30 items in each of the 16 channels, writes an element for each channel during each iteration of a loop and a I have FLUSH after I exit the loop.

  The status of the second loop is more critical time, so writing TDMS is that after the exit of the loop, and I store the data between the two in a shift register to write. I have create a new name and group every time I write to PDM data is duplicated in each new group corresponding to the State second, but not the first State. The second State writes a variable number of items in each of the 7 channels, but an equal number of each channel.

  States managed in a 1, 2, 1, 2, 1, model 2, so I'm confused why it is rinsed and the other is not.

  Any ideas? Thank you!

  rjmartinator wrote:

  I use TDMS written and PDM rinse functions in a state machine application. I write to TDMS in two States and rinse after every write.

  Worth that I will have is that hunting TDMS takes the time to write data on the disk, but does not seem to fade from the buffer, such as duplicate data following emptying. Interestingly, this happens only for a single State.

  The first State, which has no problem, writes 30 items in each of the 16 channels, writes an element for each channel during each iteration of a loop and a I have FLUSH after I exit the loop.

  The status of the second loop is more critical time, so writing TDMS is that after the exit of the loop, and I store the data between the two in a shift register to write. I have create a new name and group every time I write to PDM data is duplicated in each new group corresponding to the State second, but not the first State. The second State writes a variable number of items in each of the 7 channels, but an equal number of each channel.

  States managed in a 1, 2, 1, 2, 1, model 2, so I'm confused why it is rinsed and the other is not.

  Any ideas? Thank you!

  I guess the shift register that you use makes these messes are you compensation/Overwriting the shift registers. Anyway if you can put the code it would be then is to find the problem.

• error "memory is full" with writing a file permanently PDM

  Hello world

  I know that the problem of "memory we complete" has been often discussed in this forum, and I have read these messages, but still could not solve the problem.

  We have implemented a test function based on PXI5412 and 5122 modules. The program generates arbitrary waveforms to excite a DUT and acquires its response with digitizer and writing of the data acquired in a TDMS file (~ 40 MB for each measuring point). The program works fine in single point mode, i.e. in quiet passages. However, when I try to run it continuously in a loop TO measure several (up to 1,000) points, the program is always interrupted at halfway when ~ 10 GB of data is recorded with an error "memory is full".

  My computer has 4 GB of RAM and the operating system is Windows XP Professional 32-bit. I checked the RAM usage when the error "memory is full" happened. in fact we at least 2.5 GB unused. I learned that maybe it's because he is not a continuous free space in RAM for data. It is also suggested to increase virtual memory to 3 GB for Labview by modifying the boot.ini file. But after I did the program meets still another error "Invalid TDMS" the file reference, and so I could not write all data to a file of PDM.

  I joined the part of logging of data of my code here. Is there a another way around the problem of memory, as using the same block of memory for buffering of data between the memory of the digitizer and the hard drive?

  cheney_anu,

  I need to know your details of tdms files before I could provide a buffer appropriate setting.

  for example,.

  The current design: you write a tdms 40 GB file that contains 1000 groups (a point a group), each group contains 1,000 channels and each channel contains 1 d I16 table with 20 M of length. (Note: this 40 GB tdms file contains 1000 x 1000 = 1 M channels)

  Change:, you could write 1 d I16 table instead of table I16 2D, which could reduce the number of channel 1 M 1 k, and then reduce the memory usage.

  New design: you write a tdms 40 GB file that contains 1000 groups (a point a group), each group contains 1 channel and each channel contains 1 d I16 array with length 20G (for each point, call 'TDMS write' 1000 times in a "loop For ' and every time write 1 d I16 array with length 20 M). (Note: this 40 GB tdms file contains 1000 x 1 = 1 K channels)

• bug with the news of the spectrum

  Hello

  I have a problem with the FRF vi, which calculates the frequency response. The cluster 'info of the spectrum', the channel name is not changed when the FRF vi is looped. It seems that this problem is when the vi Polymorph selection is set to "1 stimulus, 1 reply.

  The attached vi shows my problem for a better understanding of the "bug".

  The channelname (and perhaps other properties of the spectrum) are not changed. I want to store the result of the FRF vi to a TDMS with polymorphic VI 'Write in TDMS' file available in the Toolbox for sound & Vibration. The Spectra must be registered with all of the properties and the channelname should change...

  Someone has an idea to fix this? Maybe I do not use the bandwidth as it should be, but it seems that there is a bug in the vi.

  Thanks for your help.

  Mathieu

  Hello

  I found what was wrong in my code.

  In order to have the good 'spectrum info', I put the entry "reboot on average" to true on the frequency response of vi.

  Mathieu

• Evaluate my model design AND the recommendation on LVOOP

  Hi y ' All!

  So today I would like to evaluate you my point of view on the producer consumer model pattern design (obtained after combining saw different designs on youtube / OR presentation/forum.)

  

  In so doing, I fell a lot on several video recommending OOP. Application, I'll build using this design model is an interface on screen touch (lots of controls) for a measurement system [OR usb acquisition, generate the signal, pool several analog sensors, sensors of control (sometimes not the same according to the customer), read/write file tdms (can end up being quite large), interact with PLC etc..]

  The current version of the application I'll inherit later (puns intended ) have what can be called a super-mega-gigantic cluster (cluster of clusters containing virtually all data types) happened quite a bit (loop producer and 4 loops of consumers and other places too).

  As an introduction, I used a mini cluster on this model and tried to make a comparison between the classes and groups:

  

  

  Then issue:

  1. I just do it?

  2-why the super cluster is bad? (it's so much easier to bundle - unbundle...)

  3 - What is the difference between the dynamic distribution and accessors? (On most of the tutorials and demos, I saw that they where with dynamic Dispatcher just to read and write to a class method, that I found on the accessors recently)

  4 must be done - must call parent

  5 having so much vi won't have a big impact on the performance of the system?

  6. dynamic load and more specific? (I think I understand one a bit, but any input is welcomed.

  That's all for now!

  Thank you!

  Hi Fabrice,.

  A look at this here's answers to your questions.

  1. you seem mostly right do based on what you told me that you are looking for. It seems that you have a decent knowledge on the architecture.

  2. a cluster containing a large number of items is bad because it takes a lot of memory every time that you use it. You must also transfer around the huge amount of data, which takes more time.

  3 dynamic dispatch is where a child gets automatically selected when its been based on criteria. The accessors are similar to get and set methods. If these two things are totally different.

  4. I don't understand what your question "must replace-must call parent."

  5. have a large VI does not necessarily apply the system performance. What you do in VI that affects it. However, keep in mind that you want to make your code readable by a smaller VI is therefore preferable.

  6 dynamics of just load load a class and more specific takes a parent and transforms a child.

  Let me know if you have other questions about this.

• Wrote a number to PDM

  Hi all! I have a task to implement some technical advances I/O in my code, so I decided to do a read/write with TDMS Subvi. The data that I need to write are a number, double type. The problem is that TDMS accepts the type of waveform, and when I convert my number to the PDM data type accepts, he does not write data to the file. He writes only the runtime and other irrelevant data. Is it possible to write data of double type?

  
  

• writing digital and analog/PDM

  Hi I have a PCIe6351 and try to read a digital port starting with a trigger and activating an analog trigger acquire analog data

  is there a way to do it and write a single file in a PDM

  in general, this is what I need, but for now I can not write digital TDMS when I try the collapse of the program without error message

  Each channel to a TDMS file can have a different data type.  What do you mean "the program collapses?  Have you tried to write to different groups in the file?

  If the data cannot be written to the file at the same time (in other words, if data is written sequentially in the file), you can do with the TDMS recording feature built into DAQmx: http://zone.ni.com/devzone/cda/tut/p/id/9574

• conditioning PDM output

  I have three open TDMS files and then the data is saved on my hard drive. Is it possible to control when the saving action begins and ends?

  Moreover, I can combine three TDMS files into one with separate strings?

  Your question: can I combine three TDMS files into one with separate strings?

  Answer: refer to http://forums.ni.com/t5/DIAdem/Appending-tdms-files-problem/td-p/1121142
  ----
  You can concatenate large TDMS files using the Windows command prompt (you can choose to delete the files TDMS_INDEX or concatenate them in the same order):

  copy/b "C:\temp\0.tdms", "C:\temp\1.tdms" + "C:\temp\2.tdms" "c:\temp\merged.tdms".
  ----

  Your question: is it possible to control when the saving action begins and ends?

  Answer: Sorry I don't understand your question. There is only "TDMS Write", not TDMS write Begin/End. You might put 'TDMS write' in a case of "True" (not the case 'False') of 'Structure box. You can set the terminal 'Structure Case' selector to control when to save data to the PDM file. Does make sense?