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System-wide Programming Options - Clock Switching
When the primary clock source is not able to provide the system clock, the secondary clock source is used, if it exists and is capable of providing the system clock. If the secondary clock source is incapable of providing the system clock, the tertiary clock source is used.
If none of these is capable of providing the system clock, the system searches 800 NI-BRI, 100D, 100R INA, and 100DCD modules for a clock source, starting from the first module in the system and ending with the last module. The clock is chosen with the following order of preference:
