Shared Variables and Event Structure

[Alefbb]

Hello, I'm new to Labview and I'm having some problems understanding how to use the Event Structure. Let's say I have a VI with a while loop updating at each iteration a variable X (which is shared because I will have to send it to another VI). I inserted an Event structure because I would like that when the user changes the value of the boolean 'Reset' in the front panel, then the variable X is set to zero and the while loop starts updating X from zero again, but this is not working, what am I doing wrong? I attach a snippet of the VI.

Thanks for any advice and/or correction of the code

[GerdW · Accepted solution]

Hi Alef,

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@Alefbb wrote:
I would like that when the user changes the value of the boolean 'Reset' in the front panel, then the variable X is set to zero and the while loop starts updating X from zero again, but this is not working, what am I doing wrong?

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You are doing a lot of thing wrong:

• there should be a timeout event case and no additional wait in the loop
• when you want to write to the shared variable then that variable belongs into the loop
• just overwriting that shared variable does NOT change the value in the shift register!
• the wire holding your "X" value should be wired through the event structure: no need to write to the shared variable inside the event case when you can change the wire directly…
• you might also add an event to handle the stop button…

[Alefbb]

Thanks a lot, I managed to make the code work as expected!