one dialog button

[Norbert_B]

Ok, now i am quite sure that i was correct with my suspicion:
DO NOT use the RUN CONTINUOUS button!!!!!!


hope this helps,
Norbert

[LW42]

Sorry but I sent a wrong vi, a vi without the while loop that I use. And please note that I don't use the run contineously button.

Thanks

[MikeS81]

Hi thorfano,
the dialog pops up, when the number is smaller than 0. So why do you connect -99999 to the output of the case in which the dialog is? -99999 is smaller than 0. To solve this problem you should connect 0 or a positive number to this output.

Mike

Message Edited by MikeS81 on 05-13-2008 11:53 AM

[LW42]

Hi Mike. I was asked to build this vi as a practice lesson, thus the -9999 was not my selection. However, I sent this vi just to show you the problem that I have to overcome using the one button dialog

Theodora

[Norbert_B]

Ah, now i see.....
you have an untimed while loop, so it executes as fast as possible. So after you acknowledge the dialog, the next iteration starts immediatly. Since you have no chance to change the value of "number", you will always "enter" a number smaller than 0, leading to a neverending loop.
So you have to insert a nice timing giving the user time to change the value.

hope this helps,
Norbert

[MikeS81]

Hi Theodora,

yes you are right, this is not the problem. The point is, that the value of your control not change after the dialog pops up. You can use a property node or a local varibale to reset the control value.

Mike

Message Edited by MikeS81 on 05-13-2008 11:59 AM

[LW42]

Thank you. One more question. When I add a delay to a vi is it possible to cause other problems in the vi execution? I am asking that because trying to add a delay in a similar vi caused a delay also in the stop button (please note that the stop button controls the operation of a number of instruments like pumps an valves etc.) and of course I don't want something like that.

Theodora

[LW42]

Thank you Mike. I appreciate your help.

[Ray.R]

Typically, adding a small delay should not affect the functionality.  Unless you have nested loops where the delay gets called many times before the program gets to handle the stop button request.

When dealing with operator events (ie pressing a button), it is wise to use an Event Structure.  The Event Structure would also handle changes in value of any control, thus allowing you to enter a non negative value by taking all the time you need to enter it. 😉

I have not looked at your code since I do not have LV installed on this PC.  However, to answer your question, adding a small delay should not impact your code. 

RayR

[LW42]

Thanks a lot.

Thorfano