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

Hello

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.

Problem:

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.

Note:

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:

Question:

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

Concerning

Reto

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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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    Thank you
    Ankit

    >

    WebLogicCluster 127.0.0.1:7005, 127.0.0.1:7007, 127.0.0.1:7003, 127.0.0.1:7103, 127.0.0.1:7104
    MatchExpression /app1


    SetHandler weblogic-Manager
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    DebugConfigInfo WE
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    WebLogicCluster 127.0.0.1:7003, 127.0.0.1:7005, 127.0.0.1:7007
    MatchExpression /app2


    SetHandler weblogic-Manager
    WebLogicCluster 127.0.0.1:7003, 127.0.0.1:7005, 127.0.0.1:7007
    DebugConfigInfo WE
    PathTrim /weblogic

    >

    This configuration is a little weird. He has /app1 MatchExpression and MatchExpression /app2 and at the same time two sections . Are you sure you understand what means that the configuration?

    Try something like this...


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    DebugConfigInfo WE


    SetHandler weblogic-Manager
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    http://download.Oracle.com/docs/CD/E11035_01/WLS100/plugins/Apache.html
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    Hello
    DB: Oracle 11g (11.2.0.3.0)
    OS: RHEL 5

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    >
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    >
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    Execution Plan
    ----------------------------------------------------------
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    Hi all

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

    Thanks in advance.


    Hello

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

    I think OP wants something like this:

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    (

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

    )

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

    E employee

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    WHERE DOES NOT EXIST)

    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:

    EMP_NO ENAME SAL_TILL_2010 SAL_TILL_2014

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

    1 Mickey 450 0

    2 Donald 750 0

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