Opens a trace in a Citadel database to allow writing. Use the Close Trace VI to close the reference opened by this VI. You must manually select the polymorphic instance to use. If you do not wire the database URL parameter, this VI writes data to the database associated with the default LabVIEW Datalogging and Supervisory Control (DSC) Module process. This VI returns an error if there is already an active writer for the selected trace.

Use the pull-down menu to select an instance of this VI.


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Examples

Refer to the Database Direct Write Demo.lvproj in the labview\examples\lvdsc\Data and Alarm Historical Logging\Database Direct Write Demo directory for an example of using the Open Trace VI.