National Instruments BridgeVIEW - Manual (Page 377)

Appendix A HMI Function Reference
© National Instruments Corporation A-57 BridgeVIEW User Manual
value is the latest bit array value of the bit array tag read from the
Real-Time Database.
value timestamp returns the timestamp for when the tag value was last
updated.
error indicates that an error occurred when executing the Read Tag (bit
array) VI, or that the value output returned by Read Tag (bit array) is not
valid. See value status for the specific error condition.
shutdown indicates that the BridgeVIEW Engine is shutting down. In this
case, Read Tag (bit array) no longer waits for tags to be updated and returns
immediately with both timeout and shutdown TRUE. You can use
shutdown to exit any loop that uses Read Tag (bit array).
changed? is TRUE when Read Tag (bit array) returns a new value from the
Real-Time Database. If changed? is FALSE, Read Tag (bit array) probably
timed out before the tag value was updated.