The sample clock signals when all the analog or digital output channels in the task update. Sample Clock can be generated from external or internal sources as shown in the following figure.

Figure 28. Analog and Digital Output Timing Options

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The name of terminal using the Sample Clock task can be queried using the Sample Clock Terminal Property.

Routing Sample Clock to an Output Terminal

You can route Sample Clock to any output PFI terminal. The Sample Clock is active high by default.