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 # Once

 Last update: 17.07.2025 

Returns true once the input property has been true.

The following figure shows the output prop for the input p:

![Once](/sites/default/files/git_ansys/scade_one_library_2024_r2_18_07_24/check__once_00.png)

## Interface

NameKindTypeCommentpIboolInput propertypropOboolOutput property**Constraint**: The ratio period / timeSample must be greater than 2.

**Parent topic:**[Check](../../libraries/check/check.md)