case timestamp

[oMme]

Hi,

I have case structure inside the while loop (time Vi). I want to get the timestamp when the case structure becames true. I just need single time stamp.

Thanks

[GerdW]

Hi oMme,

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@oMme wrote:

I want to get the timestamp when the case structure becames true.

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So you want to get the timestamp when the case condition changes from FALSE to TRUE?

A boolean change is called "edge", and there are rising and falling edges. You want to know the timestamp of the rising edge of your case condition!

Happily LabVIEW comes with a BooleanCrossing function…

[oMme]

Hi, Im beginer in labview. can you please provide the example? i have checked forum but could not find similer problem. 

Thanks 

[GerdW]

Hi oMme,

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@oMme wrote:

can you please provide the example?

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Please:

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@oMme wrote:

Hi, Im beginer in labview.

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Did you notice those Training resources offered in the header of the LabVIEW board?

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@oMme wrote:

i have checked forum but could not find similer problem. 

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I know there are lots of threads about the problem of detecting rising edges in boolean signals…

[altenbach]

For good measure, I would also recommend to set the VI properties to "clear indicators when called", else your indicator might show a stale value until the first trigger.

I typically just use a feedback node.

(You might want to tune according to your requirements. For example what should happen if the boolean is already true when the program starts?)

[RTSLVU]

This is where Event Structures work better than polling. 

[altenbach]

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@RTSLVU wrote:

This is where Event Structures work better than polling. 

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Yes, if the boolean is a user control. In a typical application it is polling of a condition (DI, threshold reached, etc.).

(Just guessing. Cannot look at the original VI posted in LabVIEW 2025)