how to aviod delays stopping time delayed secondary loop

[holomorph]

I have a program with muliple loops, one of which does som edata logging.  All while loops terminate when a single stop button is pressed.   The problem is, my logging loop has a time delay in it, which can be set quite high (10 min sometimes) and when I click stop, that loop waits for the time delay to finish before terminating, effectively hanging my program until it finishes.  So I'm loooking for a better way, where the program will always shut down in a few seconds, no matter what my logging interval is.   I've attached an example vi that illustrates my setup.

[johnsold]

You have no way of interrupting the logging loop to detect the stop. Here is a modified version which will do what you want, I think.

Lynn

[holomorph]

Thanks for the tip.

since I didn't care about slowness on the timescales of wire vs property node this is what I came up with; I use an event structure monitoring the stop indicator value change and having the log writing occur when that event strucure times out

I attached my new example VI in case someone else has a similar problem and wants to see a couple of different methods of solving it.

[JAMR]

I'm having a similiar problem, I'm only using one while loop and would like to stop it regarless of the delay

which can get as high as 30 minutes or more! how can I do this?

[Jared_B]

JAMR,

Could you post your VI that you are using so we can see how your program is controlled?

[JAMR]

Hi, All it is is while loop with a stop control or the error status as control to stop it.

if I insert a delay and wish to stop using the stop button this is  dependent ofn the delay

wait for millisecond function  value, this becomes a problem if the delay is for example 30 minutes

since it waits for the next loop iteration.

I would like to stop the vi as soon as I push the stop button regardless of the delay value

Thanks 

[Jared_B]

JAMR,

It sounds like you are wanting some form of "break" statement.   This does not exist for what you are wanting.  What I would recommend is having a case structure in your while loop and a counter.  When the counter reaches a certain level, it will then run the code that you are wanting to do every X minutes.  This will then allow the while loop to iterate much more frequently so that you could click the stop button and stop the loop quicker.

[JAMR]

Thanks Jared_B,

Where can I find an example of this application?

[Dennis_Knutson]

Just use the Elapsed time function.

Message Edited by Dennis Knutson on 07-17-2008 12:18 PM