Ending time delay with stop button

I am trying to create a stop button to control multiple vi's at once. A problem is that my subvi has a time delay. To solve that problem the time delay is divided into multiple time delays so that I can interrupt it with a stop button.I am building off of Al S's example on the forums found here. I tried adding a global variable but it is not working.
Any ideas? Thank you
Solved!
Go to Solution.
Attachments:
Delay.zip ‏19 KB

I wanted to thank everyone for their incouragement to learn notifiers. So I finally did and notifier were the solution I was looking for. I found help from DianeS with her 1st post here and from WayneS1234 with their 1st post here.
I am posting my code to show what I learned. I think it might help someone else. Note that this is like a block diagram with working notifiers of my larger project that I am working on.
Attachments:
Main VI Notifier.vi ‏21 KB
sub VI Notifier.vi ‏14 KB

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Stop dependant while loops with 1 button

Hi,
I am developing a utility that allows a user to configure up to 2 devices (both use same driver with a different board number), click initialize, which then brings up a file dialog and displays arrays for the data to be collected and some error messages for each measurement. The user then clicks the Start/Stop button to begin collecting and logging data. Currently i have a Wait(ms) block to allow the user to set often the measurement should be made. Currently the Start/Stop button allows collection to be started, paused, and started again. My problem is trying to have a master stop button that should stop all loops immediately when it is pressed.
I tried using a global variable for the stop button, but the measurement and logging while loop doesnt stop until after the wait(ms) block times out. Can anyone give suggestions. If i need to restructure the VI into different loops, I can do that. I just want to understand the right way to program something like this.
The VIs are attached. I removed the device specific measurement VI so that anyone can open the vis and run them to see how it works.
Attachments:
2Devices_withoutMeasurementVI.vi ‏112 KB
BuildOutput.vi ‏27 KB
stopGlobal.vi ‏5 KB

Ok. I had a chance to take a look at your code and I think you don't quite understand the concept of "dataflow". Let me see if I can help.
First of all...when I refer to your upper structure, I am referring to the first while loop, sequence structure, and subsequent while loops. When I refer to your lower structure, I am referring to the while loop containing the event structure. Just so we get our terminology straight.
I believe that you are under the illusion that your upper structure contains three parallel while loops. It does not. It contains three SERIAL while loops. There is dataflow dependency between the while loops. The sequence structure requires data that is not available until the first while loop has finished executing, so the sequence structure cannot start executing until the first while loop has terminated.
The second while loop requires inputs from the first frame of the sequence structure (which, by the way, you don't need and should get rid of...the sequence structure, I mean), so it cannot start executing until the first frame of the sequence structure has terminated. The third while loop requires inputs from the second while loop...so, again, the third while loop cannot run until the second while loop has finished executing.
Now, for your stop button. You have that global stopping all three loops. So here's what is happening in your program:
Your program starts. The first while loop executes in parallel with the loop which contains the event structure.
At some point you press the "stop" button. Both the first while loop and the loop containing the event structure finish executing.
The first frame of your sequence structure executes.
The second frame of your sequence structure executes. The second while loop reads the "stop" value from the global, so it executes once and then finishes.
The third while loop starts executing. Again, the loop reads the "stop" value from the global, so it executes once and then finishes.
Then your program terminates.
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Output power off with emergency stop button

I am using Labview 6.0.2 version, I have a state machine and within that state machine I have sequences, one sequence consist of "Auto" meaning when user press Auto button from the front panel the automated part of the program starts :basically I have alot of sequences within this sequence and using shift register the sequence numbers are passed to the next sequence and sequence number is compared outside the while loop and value defferece keeps my auto sequences running, the question is that I also have an emergency button but within the sequence I have dialog boxes show up for user to do certain things, if the user turn the power on of the device and hits the emergency stop button my sequence is taking precedence over emergen
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I can't claim to be an expert, but it sounds to me like you want to
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Noman wrote in message news:<[email protected]>...
> I am using Labview 6.0.2 version, I have a state machine and within
> that state machine I have sequences, one sequence consist of "Auto"
> meaning when user press Auto button from the fron
t panel the automated
> part of the program starts :basically I have alot of sequences within
> this sequence and using shift register the sequence numbers are passed
> to the next sequence and sequence number is compared outside the while
> loop and value defferece keeps my auto sequences running, the question
> is that I also have an emergency button but within the sequence I have
> dialog boxes show up for user to do certain things, if the user turn
> the power on of the device and hits the emergency stop button my
> sequence is taking precedence over emergency stop so if anyone has any
> idea how to deal with this let me know. thanks

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Ending time delay with stop button

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