I have a loop made to read temperature 30 times and averages it down to one value which is then displayed on the screen.

Question

My problem is that this loop is not permitting me to abort instantly because I have to wait until the for loop is done. I am using event structure which is allowing me to interrupt at any time and jump to something else in the software but nothing stops the for loop and I really need to calculate temperature by taking at least 20-30 points. I have been moving this part of the software all over the software and if I solve one problem wherever I put this vi it slows down that part of the software where I put it. I need to read te temp. all the time whle software is running.
Do you have any ideas how to speed up this VI so that it doesn't take t
his long to execute or how to build this software so that read temp.vi doesn't affect software. Thanks for your time. Here is the read temp. vi
Attachments:
Read_temperature.vi ‏50 KB

Answer 1

Hello,
Here is a simple VI (saved in LabVIEW 7.0) that uses a control reference to pass a front panel control's value into a subVI. You can run the VI, then press the "Start SubVI" button, which will cause the subVI to start running. It waits until you press the "Abort SubVI" button, at which point the "Value" property of the boolean inside the subVI is read, and terminates the loop. I am then resetting the boolean value after the subVI returns a value (this is because you cannot use the Value property on latch booleans). This should be enough to get you started.
Keep in mind that you cannot perform this operation inside an event case of an event structure, since the UI is locked while the event structure is processing the event...t
hus, you wouldn't even be able to press the abort button. In your case, you should probably have a loop handling the UI events, and a separate loop handing the data acquisition.
For more examples on using Control References, check out examples\general\cntrlref.llb. There is also extensive help on them in the LabVIEW On-line Help.
Good luck,
-D
Darren Nattinger, CLA
LabVIEW Artisan and Nugget Penman
Attachments:
ctrlref.llb ‏29 KB