Stop in subvi also aborts execution of mainvi

IS there any function that allows you to stop the mainvi's execution via the subvi i.e. stop the running of the program entirely?
Thanks

There is no generic function for doing that, except the Quit LabVIEW node and it shutsdown LabVIEW completely. That will work, but like a friend of mine once said:
"You can sucessfully stop you car by running it into a tree -- but there can be unintended consequences..."
The problem is that if you quit LV in a subVI there is no orderly shutdown, execution stops immediately. And depending upon what your code is doing this can be a Very Bad Thing.
What exactly is it that you are wanting to accomplish? How is the program in question structured?
Mike...
Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion
"... after all, He's not a tame lion..."
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How to stop a period counter in a while loop without using abort execution%3F

I am using a NI x series 6343 andcounting pulses, but when i try to stop the counter with a boolean operator nothing happens, ihave to go and use abort execution,
Help

the stop sign does not do anything, it just stops after the timeout.
Which is exactly what you're asking it to do.
The STOP button is not a magic ABORT function. It's a simple TRUE/FALSE variable.
The way you have it set up is:
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It's going to check that STOP value (is it pressed or not) ONCE, sometime during the loop. Maybe before your GET DATA, maybe during, maybe after - you don't know.
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If you want to abort the GET DATA operation, you have to find another way.
One way is to use a shorter timeout. Do you have to track it down to 1 pulse every 10 sec? If not shorten your timeout and go from there.
Another way is to find a way to abort the operation.
Again, I'm not familiar with the EXPRESS stuff you're using, so I don't know the details. In all my 26 years of LabVIEW programming, I've never once used EXPRESS stuff.
Using the regular NIDAQ stuff, you would
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Howto stop a subvi

Hi,
I have a question, I am running a SubVI within a control VI (kind of wizard like with subpanels) and I want to use an abort button in the main VI to stop the SubVI thats still running (just like the stop button within labview (next to run and loop)) Can someone help me...
thnx
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BartB wrote:
Hi,
I have a question, I am running a SubVI within a control VI (kind of wizard like with subpanels) and I want to use an abort button in the main VI to stop the SubVI thats still running (just like the stop button within labview (next to run and loop)) Can someone help me...
thnx
Bart bakels
Are you saying that you want to use LabVIEW "Abort" button to stop a VI? If so, instead of using the LabVIEW "Abort" button you use a while loop controlled by a boolean button. then when the user presses the stop button execution of your top level VI will stop. Also, you can use a Global Variable to pass the value of the boolean button to your subvi. Then when the user clicks on the boolean button, the value change will be seen by the top level VI and subVI.
You should not use the LabVIEW "Abort" button to stop execution of a program. The "Abort" button is intended to be used for development purposes.
See the attached example and run "Global Variable-Top Level VI.vi"
Chad
Attachments:
Global Variable-example.zip ‏26 KB

Abort Execution leaves USB port open

My VI opens a USB port and then processes the data in a while loop for as long as I let it run. When I manually exit the while loop the VI closes the USB port and then stops execution. Using the start control starts the loop again and the VI runs. However if I use the abort execution button on the toolbar the VI stops without closing the USB port and the VI will not run again unless I close and reopen it. How do I avoid this problem?
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So I suggest always stop the program from the front panel button.
You can hide the toolbar so that the the abort button can not be clicked.
Best Regards
Hu Yu

VI executable (.exe) without running, running continuously, abort execution and pause button

Dear All,
I want to make build an application (.exe) from a VI and I don´t want the front panel to show the running, running continuously, abort execution and pause buttons (VI Toolbar Buttons). The purpose is to make a SCADA application without the risk of accidental STOP.
Maybe the question is too trivial but I am new to LabVIEW and I don´t find the way to do it (I unchecked the "Show Abort Button", from the VI properties menuo of the Build Specifications but nothing happens).
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Stopping a SubVI without stopping the main VI

Hi,
I have a VI with two SubVIs which are being executed sequently, with the second SubVI waiting for an user event in the first SubVI. The SubVI front panels are open and used as the user interface when they are executed. When I push the stop button on the second SubVI's front panel, I do not want the whole VI to stop, but only that SubVI and execute the first SubVI once again.
Does anyone have any idea how to achieve that?
Thanks,
LordSnow.

P@Anand wrote:
LordSnow wrote:
Hi,
I have a VI with two SubVIs which are being executed sequently, with the second SubVI waiting for an user event in the first SubVI. The SubVI front panels are open and used as the user interface when they are executed. When I push the stop button on the second SubVI's front panel, I do not want the whole VI to stop, but only that SubVI and execute the first SubVI once again.
Does anyone have any idea how to achieve that?
Thanks,
LordSnow.
I am bit confused of what you try to achive. How you are executing your sub vi's if you can attach your ode it would be easy to see what you are trying to do.
Regretfully, I can't upload my code. Therefore, I will try to be more precise in my description. I open the main VI and execute it. This opens and executes the first SubVI, which waits for the user to interact with the front panel. Once this interaction has taken place, the second SubVI is executed which includes pretty much all the code there is. When I did everything I wanted to do in this second SubVI I push the previously mentioned stop button in order to stop that SubVI and that SubVI only, but right now all the VIs stop. My intention is to open the first SubVI again after I stopped the second SubVI.
Does that help?

Can I put abort execution button and Run button in GUI ?

Dear All ,
Can I put "abort execution button" and "Run button" in GUI with bigger buttons ?
Thanks.....

Hi wMw.
Aborting normally works fine for very small applications or architectures but not for anything after that. Aborting a VI can leave things in states that you don't want to be in or references open. Sometimes you do need to Abort the code though (other programming environments use Abort buttons) so I don't think we can get rid of it entirely.But try to avoid it maximum.
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Stop/ abort execution in case when the task inside while loop can not be completed

I am using Count digital events example from LabVew. This VI is using DAQmx Read vi. If I press Stop button before this DAQ gets required amount of samples VI does not stop. I tried to change amount of samples on a fly with stop button but it did not work either.
Please help.

This is directly related to the way LV handle the data. Your question is similar to "How can I stop a For-Next loop before completion ?". The answer is : No way, except changing the loop for a while loop (ie: change the algorithm) or stop the whole vi.
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Abort execution

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Main vi stops when subvi appears

Hello,
In my main vi I have a lot of thing happening in it, one of them is giving signals to a USB relay device which I connected with DAQ Assistent.
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SplitUp.PNG ‏16 KB

Stop in subvi also aborts execution of mainvi

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