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Sync Lock Lost Detection

Last Modified: July 16, 2019

Network-synchronized devices that are part of a time network are synchronized to a grand master. When the network conditions cause a chassis to lose synchronization, any task running on that chassis will error.

This can be configured in a task through the DAQmx Channel Property SyncUnlockBehavior, which defaults to StopTaskAndError, and can be disabled by setting the value to IgnoreLostSyncLock. If IgnoreLostSyncLock is configured, the task will keep running regardless of synchronization status. To query the state on a given task, the DAQmx Read or Write Property Sync.UnlockedChansExist returns whether the target is currently locked to the grand master. Sync.UnlockedChans returns the channels from the devices in an unlocked target.

Network-synchronized devices include the following devices:
  • cDAQ-9185, and 9189.
  • FD-11601, FD-11603, FD-11605, FD-11613, FD-11614, FD-11634, and FD-11637.
  • cRIO-9040, 9041, 9042, 9043, 9045, 9046, 9047, 9048, 9049, 9053, 9054, 9055, 9056, 9057, and 9058.
  • sbRIO-9603, 9608, 9609, 9628, 9629, and 9638.

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