dsc, alarm query time out

[ThHagel]

Hello,

I'm using LabVIEW 2009 SP1 with DSC-Module. Today I had trouble using the "Alarm&Event Qurey.vi" to read data from the citadel database. The Query worked well for days and delivered the data quickly. Well today it didn't, instead it delivered a time out and it didn't help to set the time out value parameter to higher values (normally I use the default value, 30s). It did not help to restart my application, nor LabVIEW, nor Windows (XP, by the way). It simply stopped working.

Then I tried my luck using the MAX and its Historical Data Viewer to retrieve the logged alarms and, unexpected, this worked! And after that, like there was magic in the air, the "Alarm&Event Query.vi" worked also again!

So, this doesn't feel very reliable. I do not interact with the citadel database using other ways than the Query vi and the Library-/SharedVariable-Settings (writing to the data base is managed by the shared variable engine).

Did someone experience the same problem and can I prevent this behavior somehow?

Thanks in advance,

Thomas

[UM]

Hello Thomas,

Unfortunately it seems that this behavior is not reproducible.

Has the error occurred again since your last post?

I checked our internal database and I was not able to find any hints, that this is a common issue.

Could you please post the important section of your code, if the error appears again?

So we can dive a little bit more into detail.

Regards

Ulrich
AE NI-CER