Boolean Crossing PtByPt VI

[glendale]

Hi, I am new to LabVIEW and have try to use the Boolean Crossing PtByPt Vi as attached but it does not cross into the stage when I trigger the input. Can you advise? Thank you.

 

[StevenD]

Looks like you are trying to capture the event of a boolean changing. Lucky for you there is a structure to help called an event structure.

See what happens when you make a vi like this:

[glendale]

Thanks, Steven

[wiebe@CARYA · Accepted solution]

---

@glendale wrote:

Hi, I am new to LabVIEW and have try to use the Boolean Crossing PtByPt Vi as attached but it does not cross into the stage when I trigger the input. Can you advise? Thank you.

---

You didn't attach a VI, you attached an image of the VI.

The crossing probably is detected, but your VI runs so fast (without a wait) that you won't be able to tell. The crossing is only true for one iteration, and that will last for <1 ms.

Run the VI with execution highlighting on. Or put a wait in the VI. Or make the loop stop if the condition it true.

Once you get the problem, step up to the suggested event driven solution.

[glendale]

Thanks, Wiebe

Yes, I get to know where is my problem here, thanks for sharing.

TS