How to log waveform chart data in any file at specific interval

i am using labview 7.0. i want to save waveform chart data in the file at specific interval given by user. Please give me solution for that.
falgandha

Open the example finder (Help>>Find Examples) and look at the Write Datalog File example. You can also convert your data to text to save a simple text file. Also, the tutorials in the following links probably cover something similar.
To learn more about LabVIEW, I suggest you try searching this site and google for LabVIEW tutorials. Here, here, here, here and here are a few you can start with and here are some tutorial videos. You can also contact your local NI office and join one of their courses.
In addition, I suggest you read the LabVIEW style guide and the LabVIEW user manual (Help>>Search the LabVIEW Bookshelf).
Try to take over the world!

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How to take waveform chart data and put it into an array

Hello all,
I am new to programming in Labview, and am learning basically by watching youtube video and such. My question is how to take a set of random data that I have written code for and linked to a waveform chart, and put the data into an array so I can calculate the mean of the data set. If there is an easier way to calculate the mean of the data set I am all ears, but I need to be able to display the mean on the front panel each time the code is run. I have attached a file of my code.
Thanks
Attachments:
CA1.vi ‏11 KB

Welcome.
If you have not done so, look at the on-line tutorials on Getting Started with LabVIEW on the NI web site.
A chart has a property known as History which retains some previous values. You can get access to the the History property by popping up on the block diagram terminal of the chart and selecting Create >> Property Node. Note that the history length can be set via a pop up menu. The default length is 1024.
Other comments: When you know the number of iteration in advance you should use a for loop rather than the while loop.
You can also use an autoindexing tunnel at the boundary of the loop to create an array. It only contains the values from the current run, unlike the chart history which can retain values between runs (as long as the VI remains in memory). Watch the two Mean indicators as you run this VI several times.
The error wire is to assure that the history property node runs after the loop. Disconnect the wire and watch the Mean and Mean 2 indicators carefully.
The Wait is to slow things down a bit so that you can see what is happening.
Lynn
Attachments:
CA1.2.vi ‏11 KB

How to Write Waveform graph data to Text File with user option to do so

So, I'm new to labview and am having trouble writing one program in particular. I have a waveform graph that runs for 120 seconds generating a sine curve. I am, however, having a difficult time getting the program to write the x and y coordinates into a text file. I have attached what I have so far.
The first task I was assigned was to write a program that creates a snusoidal curve on the front pannel adding one data point each half second for 120 seconds. The plot should only start when the user presses a start button.
The next part involves giving the user an option to write the generated data to a spreadsheet file called "sine.txt". The file name and location should be hardcoded. The file should contain the x and y coordinates of each data point in columns separated by tabs, also known as delimited.
I have spent several hours tweaking the attached program and I just can't seem to get it to work right. Any suggestions would help at this point.
Sincerely,
A frustrated chemistry student whose research mentor is out of town
Solved!
Go to Solution.
Attachments:
Sinusoidal Curve (saving to excel).vi ‏45 KB

First, you are not creating Excel files. You are creating text files. And it seems that your Write to file is already creating X (time) vs. Y (data curve) that is tab delimited.
Everything else you are doing is just too complicated or a Rube Goldberg.
All you need is the attached.
Attachments:
Sinusoidal_Curve_(saving_to_Text_file).vi ‏69 KB

How to download the script data into pdf file

how to download the script data into pdf file
i have one option to download the script data to pdf file --->rstxpdft4 program.
i have one doubt how to use this proogram.or any function module to download the script data to pdf file.
Thanks and regards,
Sri.

Hi Sri Sai,
I know one method to convert the sapscript to pdf file :
first generate a Spool Request for the required Sapscript
then goto transaction SP01 and copy the generated Spool Request number
now execute the SAP report RSTXPDFT4
here enter the copied Spool request number and the target directory into the parameters
execute the report
required pdf file will be generated into the target directory
i hope it will help you out
Please refer this simple program:
http://www.sapdevelopment.co.uk/reporting/rep_spooltopdf.htm
Reward points if found helpful....
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Eshwar.

HOW CAN U CORRECT THE DATA IN UR FILE WHICH CONTAINS 1 LAKSH RECS

Hai Frnds,
i Attend an interview they asked this questions can u know the answeres . tell me .
In File to file scenario how can we reprocess records which failed records.
HOW CAN U CORRECT THE DATA IN UR FILE WHICH CONTAINS 1 LAKSH RECS
Thanks in advance
thahir

Hi,
Refer these links:
this might help you
Generic Approach for Validating Incoming Flat File in SAP XI - Part 1
Generic Approach for Validating Incoming Flat File in SAP XI - Part 1
validating against schema file for the output XML file
Informing the sender about bad records
Regards,
Nithiyanandam

In Firefox 4 how can I cause the date on downloaded files to be the current date? (Some are and some are not. In FF3 the dates were ALWAYS the current ones.)

In Firefox 4 how can I cause the date on downloaded files to be the current date? (Some are and some are not. In FF3 the dates were ALWAYS the current ones.)
== This happened ==
Every time Firefox opened
== I upgraded to Firefox 4 (beta)

Firefox 3.6.* and earlier set the downloaded file's modification time to the current time. In Firefox 4.0 the behavior has been changed, if a server returns a timestamp telling when the file was last modified (Last-Modified header), it is used instead.
You can revert to the previous behaviour by using the [https://addons.mozilla.org/en-US/firefox/addon/93121/ Download Timestamp] add-on.

How to set waveform chart to start data since beginning of run

Solved!
Go to Solution.
Attachments:
TCs.vi ‏106 KB

You need to check the update mode of your chart.
Strip Chart—Shows running data continuously scrolling from left to right across the chart with old data on the left and new data on the right. A strip chart is similar to a paper tape strip chart recorder. Strip Chart is the default update mode.
Scope Chart—Shows one item of data, such as a pulse or wave, scrolling partway across the chart from left to right. For each new value, the chart plots the value to the right of the last value. When the plot reaches the right border of the plotting area, LabVIEW erases the plot and begins plotting again from the left border. The retracing display of a scope chart is similar to an oscilloscope.
Sweep Chart—Works similarly to a scope chart except it shows the old data on the right and the new data on the left separated by a vertical line. LabVIEW does not erase the plot in a sweep chart when the plot reaches the right border of the plotting area. A sweep chart is similar to an EKG display.
From the help menu:
The waveform chart maintains a history of data, or buffer, from previous updates. Right-click the chart and select Chart History Length from the shortcut menu to configure the buffer. The default chart history length for a waveform chart is 1,024 data points. The frequency at which you send data to the chart determines how often the chart redraws.
Attachments:
resp2.jpg ‏36 KB

How to pass waveform chart in a loop in a sub vi to calling vi

It has been awhile since I made my last application. It has escaped me how to run a VI with a loop in it as a sub VI and still pass the waveform chart up to the calling VI. I am trying to use the Bridge Continuous example as a sub VI and pass that waveform chart up to the calling VI that selects which load cells to monitor. But when i run the calling VI it stops at the sub VI with a green arrow.

Your acquisition needs to run in parallel with your main loop. You should also use a queue or notifier to send that parallel process commands (like to stop). I would use a User Event to send the data from your aquisition to your main loop's event structure. You can then update the chart inside of the event structure.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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How to clear waveform chart

How i can clear a waveform chart with dynamic datas? The normal procedure with handover a empty array doesnt work.
Uwe Augst
Muehlbauer AG
Germany

Hi,
here´s a small example with a property node (Historie), everytime you restart that VI, first the chart is cleaned up and than refilled again.
Hope this helps,
AlexMessage Edited by Alex R on 05-03-2005 11:18 AM
Attachments:
Clear Waveform-Chart.vi ‏21 KB

Waveform chart data to file

dear sir,
iam getting eight different plots on waveform chart with system date and time. Now i want to store this eight values with system date and time in excel file as per specified time interval. it shoould be online because i don't want to stop my vi to save that data in file. Is it possible? If yes please help me.
thanking you
falgandha

Falgandha,
this can be done with ActiveX or just saving the data as spreadsheet file and then importing it to Excel.
If you like to know more about Excel and ActiveX, you should take a look into the ActiveX-examples of LabVIEW.
Saving data as spreadsheet file is available as examples as well, but maybe it is sufficient for you to use the "Write To Spreadsheet File.vi" from the file IO palette.
hope this helps,
Norbert B.
CEO: What exactly is stopping us from doing this?
Expert: Geometry
Marketing Manager: Just ignore it.

How Clear a WaveForm Chart Programmatically?

Hi LabView Masters!
Can I Clear a WaveForm Chart Programmatically?
I know that I can clear the chart clicking with the mouse, but I need to
clear it when a particular variable is high. (Programmatically)
I have been testing the Attribute Node but I didn't got it.
Thanks in advance for your help!.
Francisco Javier Fernandez Luna
Ingeniero Tec. Industrial en Electronica.
Tel: 619 81 98 31
E-mail:[email protected]
ó [email protected]
"Let's make things better" (PHILIPS)

try to use property node of the chart and connect an empty array to
"history data" field
Paco Luna a écrit dans l'article
<01beae87$7fe22e60$[email protected]>...
> Hi LabView Masters!
>
> Can I Clear a WaveForm Chart Programmatically?
> I know that I can clear the chart clicking with the mouse, but I need to
> clear it when a particular variable is high. (Programmatically)
>
> I have been testing the Attribute Node but I didn't got it.
>
> Thanks in advance for your help!.
> --
> Francisco Javier Fernandez Luna
> Ingeniero Tec. Industrial en Electronica.
> Tel: 619 81 98 31
> E-mail:[email protected]
> ó [email protected]
>
> "Let's make things better" (PHILIPS)
>

Save chart data to the file constantly

I am aqcuiring analog data from DAQ USB 6000 and outputing it on the chart. I have to save all the data to a file as well (text or excel...or at least some file). It is easy to configure it so, that the data is saved after the stop button was pressed- so only at the end of the run. However, I need to write to a file during the programm running because it might be running for days. In a such long time, the buffer is overloading, and the data is lost.
Could you please advise any way of how to write data to a file constantly during the measurement, wthout saving it into the buffer?
Solved!
Go to Solution.

Personally, I would use the DAQmx Configure Logging function. This will make DAQmx stream the data to a TDMS file as you read the data. You just tell it where to put the file. It is extremely simple and fast. There is a free add-on to view TDMS files in Excel, if that is a concern.
EDIT: Just noticed that you are useing the DAQ Assistant. There is a Logging tab in there to set up the streaming to TDMS. I recommend getting away from the Express VI and learn the actual DAQmx API. You can make things a lot more powerful and efficient if you do. They will also be easier to debug since you do not have to open up a configuration window just to see your settings.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines

Charting data from text file in LabVIEW 5.1 for Windows

I am having some difficulties trying to figure out how to plot a chart with
data from a file. I would like to be able to read data from a text file
into a chart using LabVIEW 5.1 for Windows. I have looked in the help
within the program and online. I have also looked in the user manual and
the book "LabVIEW for Everyone". Could you please give me specific
instructions on how I would construct the program to be able to do this.
Thank you.

Hi Ellie,
It depends on how data is stored in that txt file. Usually you load the data into an array either using or , the array if necessary and send it to the graph indicator in required form. If you want a more detailed answer, send me a sample data file ([email protected]).

How do I get the date of a file in an FTP?

As stated in the subject.
I am at wits end trying to get the date of a file from FTP(Stuck for days).
I tried the "URLConnection" Class but could only get me the size of the file with "getContentLength()"
"getContentDate()" & "getLastModified()" both give me a 0. They only works for files on HTTP but not FTP.
Anyone has any simple solution on how to get the date of a file on FTP?
Thanks in Advance.

The FTP specification has long awaited the magical file meta-data access protocol, which never came. There is no FTP defined manner to obtain the date of a file. The common work-around is to get the containing directory list and <shudder> parse the format of the returned text for the target file and date. Since there is no standard directory listing format, there is no guarantee that you will be able to get that date, and your application would have to cry to the user for help.
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I hope you find this of some help.

How to submit pdf xml data to a file server

Hi, I am hoping someone can help me. I have created a dynamic pdf in livecycle designer ES, which appears as the requester wants it to. I now just need to work out how to collect the submitted data. Is it possible to submit the xml data to a file server? I have succeeded in emailing the data, but each response is separate xml attachment and would then need to collated, etc. It would be preferable to submit the data directly to a file server if this is possible. Even if it submitted into a database or something. From everything I have read so far, it seems that this is not possible, unless I am missing something. As a newbie to this, any assistance would be much appreciated. Thank you.

You can submit the data as XML or URL-encoded data (HTTP POST). In either case you will need to have a server-side process to receive and parse the data stream. The server-side process may be a JSP, a servlet, PHP or any technology that can manage HTTP requests/responses.
See About submitting data using a button at http://help.adobe.com/en_US/livecycle/9.0/designerHelp/000330.html .
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How to log waveform chart data in any file at specific interval

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