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Internal PLL Unlock Status

Last Modified: May 2, 2019

Two NI-DAQmx Read attributes/properties allow you to check if the PLL was unlocked during data acquisition for a task. The first is PLL.UnlockedChansExist. This attribute/property returns a Boolean true if one or more channel PLLs became unlocked during the previous acquisition. The second is PLL.UnlockedChans. This attribute/property returns an array of strings indicating which channel PLLs (if any) became unlocked.

PLL.UnlockedChansExist can only be used when the task is in a stop state but is still reserved. You can also explicitly commit, start, and then stop the task without explicitly uncommitting using the DAQmx Control Task VI.

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