VI does not have dynamic user event

I have several screw running in parallel. I want to instantly communicate a VI data to another.  I am trying to achieve using user events.  All my screws share a dynamic event via a global variable reference.  When I run the event user a VI, about 80% of the time it is received correctly by the other VI.  The other 20% of the time, the event is not received, and the data is transmitted as planned.  Here is some information on the screws that make the transmission and reception:

Transmission of VI: front is open, no activity happening on the Panel, no calculation happening.  After I sent the user event, the event loop goes to the waiting state.

Recieviing VI: front is closed, any activity that happens.

What a bad way to pass data from a VI to another?  I don't like the use of global variables because you need constantly query variables and you can run in race conditions, but maybe it's what I do.  Does anyone have experience using the user events to pass data between the screws?

j_osh_o wrote:

Then I do a registration Dynamics refnum and record worldwide.

This is most likely the source of your problem. The documentation do not insist on this point (and LV does not apply it), but you should NEVER share event reg refnums between the structures of the event. Each structure the event must have its own reg for node events or your events will go away, as you saw.

As long as you remember this rule of thumb, the architecture you are using must be fine, although I would usually avoid putting references in globals. You seem to have got a few percautions (high level VI opens to them, made sure to write before running the readers as a writer), so it will probably not break for you, but still.

Anyway, as others have mentioned, there are also other means of transmission of data between screws autour

Tags: NI Software

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