LabVIEW
how to execute a case structure only once
Solved!
mia.lara wrote:I`ve searched in many threads this question but I still don´t undestand how to make an event to execute only once when true, without having to stop and run again the VI for executing once again...
If I wire a boolean control, for example, to a case structure that contains a beep VI, it sounds continously when true... I want it to beep only once when true, but if I switch to false and true again, that beeps again only once... I haven´t found how...
There are a couple of confusing points in your description, for example a value change event executes only when the value changes, so it will only execute going off->on and on>off and will not continuously fire as you describe. And stopping and running the VI again should not make a difference.
In the second paragraph you suddenly talk about a case structure (what happened to the event?)
Could you please be a bit more specific. Why not attach one of your code attempts so we can hopefully understant what you actually have.
If you want the button to go true for an instant and go back to false automatically once it was read by the code, use a latch action button. If you want the button to toggle whenever you press it, but still only trigger the beep when the state goes from false to true, all you need is a feedback node and an "implies".
Have a look at the logic for the Off>On LED in the example posted here.
