Eventstructure confused by different lock frontpanel preferences

[steinhagelvoll]

Hello,

I've encounterd a Problem, which might be a bug in Labview. I'm using LV 2011.

I have got a eventstructure within a whileloop. Eventcase A should not lock the frontpanel. Eventcase B should lock the fp. Here is the Problem:

First I trigger A und the fp isn't locked. While A is calculating I trigger B and even though B is not runnig yet the fp is already locked. This make no sense to me. Is this bug fixed in LV2012?

I attached an example.

Yours

Matthias

[crossrulz · Accepted solution]

Nope, that is normal behavior.  Once an event with the fp lock has been triggered, the front panel will be locked until that event case has completed.

[drjdpowell]

That's how it is intended to work.  The lock happens from the instant the event is triggered, not just while it is being handled.  If you don't want that then you must turn it off.

[Norbert_B]

This is expected behavior. You have several issues in the code regarding your event structure which are covered in the caveats of event structures.

The ones you break are:

• Remember to read the terminal of a latched Boolean control in its Value Change event case.
• If a While Loop that contains an Event structure terminates based on the value of a latched stop Boolean control, remember to handle the latched stop Boolean control in the Event structure

Additional, i suggest you to change the mechanical action of the boolean controls to latch (instead of switch) since a switch always should indicate a toogle function.

Norbert