National Instruments NI-IMAQ - Manual (Page 38)

Chapter 4 Programming with NI-IMAQ for 1394 VIs
NI-IMAQ for IEEE-1394 Cameras User Manual 4-12 ni.com
Error Handling
Every NI-IMAQ for 1394 VI contains an error in input cluster and an
error out output cluster, as shown in Figure 4-12. The clusters contain a
Boolean value that indicates whether an error occurred, the code for the
error, and the source or the name of the VI that returned the error. If error
in indicates an error, the VI passes the error information to error out and
does not execute any NI-IMAQ for 1394 function.
Figure 4-12. Error Clusters
You can use the Simple Error Handler VI (Functions»Time&Dialog
palette) to check for errors that occur while executing a VI. If you wire an
error cluster to the Simple Error Handler VI, the VI deciphers the error
information and displays a dialog box that describes the error. If no error
occurred, the Simple Error Handler VI does nothing. Figure 4-13 shows
how to wire an NI-IMAQ for 1394 Cameras VI to the Simple Error
Handler VI.
Figure 4-13. Error Checking using the Simple Error Handler VI