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Select append but automatically overwrites

We are trying to use the write to measurement file vi and are trying to append the file. We have our file as .lvm to save to. We have selected the append button, yet the data does not append. When we had .tdm, it appended perfectly, yet we switched so that we can add some other data into the file. When clicking on the write to measurement vi after we've run the program, the dot jumps to overwrite for a second and then jumps back to append. Is there an easy fix? Maybe something isn't clicked that should be?
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I have managed to replicate all the behaviour you have described except the problem. Yes, then you open the Properties... window, the option starts at "Overwrite" and then jumps to "Append" (if that was selected before). But then I write to the measurements file, it appends the data just like it should. I am using the same format (.lvm). Maybe your code is somehow specific.
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While evaluating my code please have in mind that I am a LV novice. Therefore sometimes my code might violate some coding rules that I have to learn about myself. But how else could I do that... 🙂

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Here are my files, they're fairly simple. One thing is that I have 8.6 on this computer and the newest one on the desktop i'm writing the program. So I can't run the program on this computer even though I've saved it as 8.6 because of the write to file VI. But this will show you at least the code. Unfortunately, the computer I'm writing on which has the newest labview is to be used in a hospital so it has no internet connection at this time so sorry I can't post that.
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Test1.jpg

 

It works just fine. The second writer appends perfectly too. 

 

I'm using LV 9.0.

 

Are you sure you have closed the files you are appending to before writing to them? Also then I have opened your VIs, I have had to repeatedly set Write to Measurement File.vi property to "Append". You could try the same just in case.

Message Edited by Giedrius.S on 02-19-2010 11:24 PM
EDIT:
I have tested it in LabVIEW 8.6 and it does not work as it should (yet in the similar conditions in LV 9.0 it does work).
Probably a bug, which has been fixed in LV 9.0 (?).
Message Edited by Giedrius.S on 02-19-2010 11:30 PM
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While evaluating my code please have in mind that I am a LV novice. Therefore sometimes my code might violate some coding rules that I have to learn about myself. But how else could I do that... 🙂

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Hello All,

 

This behavior was an issue originally documented in Signal Express 3.0 via Corrective Action Request (CAR) #125759. It version for repair was listed as 2009. As there are many shared components between the LabVIEW development system, and the Signal Express environemnt, likely a lower level addition was made that affects both platforms. 

 

I have also confirmed this behavior, with respect to 8.6 testing vs. 2009. As you have uncovered here, upgrading to 2009 should resolve the issue.

 

Thank You,

 

PCorcs

Patrick Corcoran
Application Engineering Specialist | Control
National Instruments

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