Appendix A
HMI Function Reference
A-16
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National Instruments Corporation
error indicates that an error occurred when executing Read Alarm Tag, or
that the value returned by Read Tag Alarm is not valid.
shutdown indicates that the BridgeVIEW Engine is shutting down. In this
case, the Read Tag Alarm VI no longer waits for a change in the tag alarm
state and returns immediately with both timeout and shutdown TRUE.
You can use shutdown to exit any loop that uses the Read Tag Alarm VI.
changed? is TRUE when Read Tag Alarm returns a new alarm state from
the Real-Time Database. If changed? is FALSE, the Read Tag Alarm VI
probably timed out before the tag alarm state was updated.
alarm message is the user defined string message displayed along with the
alarm notification for a discrete tag. Notice that this output is not valid for
any tag type other than discrete.
