National Instruments BridgeVIEW 用户手册
Appendix A
HMI Function Reference
© National Instruments Corporation
A-23
Get Historical Tag List
Use the Get Historical Tag List VI to obtain the list of tags that have historical data available
in the historical database.
in the historical database.
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
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.
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
executes. For more information about this control, see the section
in this appendix.
history tag list is the list of tag names that have historical data logged.
Citadel path out is the path to the directory containing historical data files.
first timestamp is the date and time associated with the first data point
logged in the given set of historical data files.
logged in the given set of historical data files.
last timestamp is the date and time associated with the last data point
logged in the given set of historical data files.
logged in the given set of historical data files.
error out is a cluster that describes the error status after this VI executes.
For more information about this indicator, see the section
For more information about this indicator, see the section
in this appendix.