Greetings,
The 6527 does not support triggering, but it does support messaging in the form of change notification. With change notification, the 6527 generates a message when one or more user-selected lines changes (low to high, high to low, or both). You could use this notification of a change to read the status of other input lines. An example using this feature is installed with LabVIEW in the following location:
Examples >> Hardware Input and Output >> DAQ >> Digital Input and Output >> 652x >> DIO652x Change Occurence.vi
Good luck with your application.
Spencer S.