Reads the historical data for a given variable using the specified time interval, up to the max points per trace specified. You must manually select the polymorphic instance to use.

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


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Read Trace Details

If database URL is unwired, this VI reads the trace name from the database associated with the default DSC Module process.

If you do not wire time interval, this VI returns all historical data for the trace, up to max points in trace specified. If you do not wire max points in trace, this VI returns all points between the start and stop timestamps set in time interval.

Examples

Refer to the NIHyperTrend Graph XML Configuration.lvproj in the labview\examples\lvdsc\HMI Design\NIHyperTrend Graph XML Configuration directory for an example of using the Read Trace VI.