National Instruments BridgeVIEW - Manual (Page 344)

Appendix A HMI Function Reference
BridgeVIEW User Manual A-24 © National Instruments Corporation
Get Historical Trend Info
Use the Get Historical Trend Info VI to obtain the first and last timestamp available in the
historical database for a given tag, and the type of the tag, whether analog or discrete.
Citadel path in is the path to the directory containing the Citadel historical
database. If this path is empty, the VI attempts to use the historical data
directory configured in the active
.scf file. If this has not been configured,
the VI prompts you to select a data directory.
tag name is the tag about which you want to obtain historical trend
information.
error in (no error) is a cluster that describes the error status before this VI
executes. For more information about this control, see the section
Errors
Not Reported by the BridgeVIEW Engine in this appendix.
data type is the type of tag, whether discrete, analog, or bit array.
Citadel path out is the path to the directory containing historical data files.
first timestamp is the date and time associated with the first value logged
in the database for this tag.
last timestamp is the date and time associated with the last value logged in
the database for this tag.
error out is a cluster that describes the error status after this VI executes.
For more information about this indicator, see the section
Errors Not
Reported by the BridgeVIEW Engine in this appendix.