Global variable in an event loop

[Thijs Boeree]

Hi,

I have a global variable from one VI and want to read it in another VI but
only if the value has changed, i want to do it with an event case but it
doesn't do any thing when a read my Global variable in an event when the
value has changed?

Does anyone knows how to do this?

Best regards,
Thijs

[Mads]

You'll either need to generate a user event, or set the value using a value (signaling) property and let the "listener" create a dynamic value change event based on a reference to the indicator in use.

With user event:
Create a user event and give both the VI that is to react to a change event and the global (functional global) a reference to that event. Inside the global you check if the value differs from the previous one whenever it is written to, and if it is then fire the event.

[Feroz]

Hi,
The reason why the event structure is not detecting the event is explained in the document below:

Event Structure Does Not Capture the Value Changed Event...

Sincerely,
Feroz
National Instruments