variable sharing, missing data, the timestamp even for two consecutively given


I have a problem with missing data when I read a published network shared variable.

Host VI:

In a host of VI on my laptop (HP with Windows XP Prof.) I write data to the shared Variable 'data '. Between two consecutively write operations is a minimum milliseconds of wait time. I use it because I want to make sure that the time stamp of each new value of data is different then a preview (variables shared the resolution is 1 ms)

VI target:

the VI target cRIO-9012 bed only of new data in the way that it compares the timestamp of a new value with the time stamp of the last value on a device in real time.


rarely, I'm missing a data point (sometimes everything works fine for several hours, transfer thousands of data correctly above all of a sudden failure occurs). With a workaround, I'm able to catch the missing data. I discovered that the missing data have the timestamp exactly the same, then the last point of data read, is so ignored in my data 'legal '.

To summarize, the missed value is written to the variable shared host, but ignores the target because its timestamp is wrong, respectively the same as the last value, despite the host waits for a minimum of 10 milliseconds each time before writing a new value.


The shared Variable is hosted on the laptop and configured using buffering.

The example is simple only to display the function of principle, in real time, I also use a handshake and I guarantee that there is no sub - positive and negative.

Simplified example:


Anyone has an idea why two consecutively data can have the same timestamp?

Where timestamping (evil) Finally comes (System?)?

What would be a possible solution (for the moment with shared Variables)?

-> I tried to work around the problem with the clusters where each data gets a unique ID. It works but it is slower that comparing the timestamps and I could get performance problems.

It would change anything when I animate the shared on the RT System Variable?

Thanks for your help




This problem has been resolved in LabVIEW 2010.  You can see other bugs corrections in theReadme of LabVIEW 2010.

Tags: NI Software

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    After upgrading Firefox, I decided I didn't like the look of the new progress bar and it turns off in Tab Mix Plus. I disabled and deleted from Tab Mix Plus later, opting to use the utilities tab instead. Since I removed the Tab Mix Plus, tab load bars are missing.

    I tried to reinstall Tab Mix Plus, which makes progress bars to reappear... until I removed the TMP it's (without disabling the progress bar in TMP this time).

    Y at - it an option of chrome that I disabled because of Tab Mix Plus?

    Firefox 4 does not include a loading tab progress bar. Mozilla testing one for Firefox 4 development but removed because of performance issues. You will need to use an add-on like Tab Mix Plus or status-4-Evar to get a progress bar.

  • Sticker missing with the product key for Vista

    I am in Europe and IV ' e just fresh installed copy of Windows Vista Home Premium I got another computer with key on this subject, but that key is maxed out on activation... so I'm in a little trouble here, got a few numbers in my another serial key and some are missing and others had to put my eye but can guess their how I have some or not all the figures for the barcode on the sticker with the license... How can I get the serial key full, I think it's really really frustrated if I have to buy me yet another copy of windows, I have a lot of XP series and so on, have need, I need this code, so I can upgrade my cpu to win 7... help please

    * original title - Hi, I had a problem, I don't see the serial key in the stick on my computr, I had X letter is missing, DDDDd-DDDDd-XXXXX-DDDDD-DELALANDRE... but I have several on the bardcode. !! *

    I am in Europe and IV ' e just fresh installed copy of Windows Vista Home Premium I got another computer with key on this subject, but that key is maxed out on activation... so I'm in a little trouble here, got a few numbers in my another serial key and some are missing and others had to put my eye but can guess their how I have some or not all the figures for the barcode on the sticker with the license... How can I get the serial key full, I think it's really really frustrated if I have to buy me yet another copy of windows, I have a lot of XP series and so on, have need, I need this code, so I can upgrade my cpu to win 7... help please

    Hey Bjarnikr

    If you have already reinstalled vista and you don't know the product key we can not help you

    If you had contacted these forums before you reinstalled vista we helped you with key finder programs

    but as this is a new installation of vista not activated we cannot help you find the product key

    If it is preinstalled, I suggest that you contact the manufacturer of your computer and ask them about recovery disks

    normally, they do not require you to select a product key when you use them to reinstall vista

    you don't say how you reinstalled vista

    and a vista license = a vista installation

    and the oem licenses cannot be transferred to another machine

    the retail license can be transferred, but that only one installation per license is allowed at any time

    Walter, the time zone traveller

  • Rufus (free utility) takes 2 minutes to create a USB bootable for ESXi installation starting source who becomes the target of the installation, even for 5.5

    Just info, one of these open Windows source rare beads that are becoming more and more difficult to find on the web these days, in the middle of a see payloads of downloader.

    Rufus I found to be very convenient for the quick creation of a USB flash drive you can start from, and then only install, for ESXi, no command-line stuff to memorize necessary and very fast:

    works very well with ESXi 5.5 also:

    and when finished with this flash drive and you want to use it for something else (but normal reformatting does not work), she who manages, even on Windows 8.1:

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    Format a USB to start the ESXi Installation or upgrade

    Documentation Centre of vSphere 5.5

    Windows diskpart commands or potentially dangerous. Really fair, fast and useful for pretty much everyone.

    Thoughts and opinions?

    Just a follow up on my comment about several injection of VIB in the ISO that you use as a file source for Rufus (a few months back, seen above):

    Here is the article that came out of this subject (Yes, it works!):

  • Please help me with the Alternative of queries to replace the UNION ALL for two queries

    Hi all

    I have the query to retrieve assets employees salary count and in so far as below:

    Select ename, emp_no, sum (sal_till_2010), sum (sal_till_2014) of

    (select emp_no, ename, salary as sal_till_2010, 0 as sal_till_2014 of employee e1

    where effective_date < = 1 January 2010 ' and not exists (select 1 from e2 employee_deletion where e2.emp_no = e1.emp_no and e2.deletion_date < = January 1, 2010 "")


    Select ename, emp_no, 0 as sal_till_2010, salary as employee e1 sal_till_2014 - here is a dummy 0 salary until 2010 for the union of all the

    where effective_date < = 1 January 2014 "and not exists (select 1 from e2 employee_deletion where e2.emp_no = e1.emp_no and e2.deletion_date < = 1 January 2014") "

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    In this query, I get the total salary until 2010 and until 2014 in the employee table, dates are dynamically passed to the procedure, and this can change.

    But assume the date above and let me know the alternative of queries to improve performance because I use Union ALL and read the same table twice in the above query.

    Advice me with request to read the table once to fetch the same data as the above query.

    Thanks in advance.


    Thanks for the display of the data of the sample; It's very useful!

    I think OP wants something like this:

    WITH cutoff_dates AS


    SELECT TO_DATE (January 1, 2010 ', ' DD/MM/YYYY') AS cutoff_date, 2010 UNDER the label OF dual UNION ALL

    SELECT TO_DATE (1 January 2014 ', "DD/MM/YYYY"), double 2014


    SELECT e.emp_no, e.ename

    , NVL (SUM (CASE WHEN c.label = 2010 THEN e.salary END), 0) AS sal_till_2010

    , NVL (SUM (CASE WHEN c.label = 2014 THEN e.salary END), 0) AS sal_till_2014

    E employee

    JOIN cutoff_dates c ON e.effective_date<=>


    SELECT 1

    Of employee_deletion ed

    WHERE ed.emp_no = e.emp_no

    AND ed.deletion_date<=>


    E.emp_no GROUP, e.ename

    ORDER BY e.emp_no


    Output of your sample data:


    ---------- ------ ------------- -------------

    1 Mickey 450 0

    2 Donald 750 0

  • I'll be able to use the Apple Watch for two weeks before the arrival of my new iPhone?

    My watch will happen before my iPhone. I'll be able to use it for the basic functions such as read the time and counting took place before my phone arrives?


    No, I'm afraid not - you only will be able to set up your Apple Watch after having coupled with your iPhone.

    Set up your Apple Watch - Apple Support

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