Set the indicator value only once

Hello

I'm relatively new to LabVIEW, so I was wondering if you could give me some advice as how to accomplish a task.

I am trying to store the timestamp at which a signal caused a block "Trigger and gate" trigger. I joined my current attempt to do this. The idea is essentially to wait the trigger signal to go out and put the component 't0' of it within an indicator. The problem is that after I store the t0, the while the iteration is complete. For the next iteration, new data comes from. Because the trigger is already triggered the previous iteration (it has no trigger stop), this new data t0 will then write to the indicator. But this isn't what I want. Is it possible to write data only to an indicator if it does not contain a value already?

My plan is to take the blocks from the trigger and active in the end (see the picture I have attached) and create a Subvi from it. The data source will be outside the Subvi, so I can connect different sources during the tests. It means (as far as I know), that the Subvi is unclear it is integrated inside a loop, so I won't be able to use the features of a loop (ie: shift registers) to solve my problem.

Do you have any suggestions as to what I should try?

Thank you!

PS: Has the computer on which the final code will run on LabVIEW 8.6

kkrizka wrote:

Is it possible to write data only to an indicator if it does not contain a value already?

"" Place the indicator insde the true case of a structure of the case and the wire the "first call?" primitive to the terminal selector.

Tags: NI Software

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