This was originally posted on the vision board, but I have moved it here after a suggestion.
I have up to now always coded labview in a
fairly linear manner. My applications typically involve one thing
happening, then the next, then the next. However, I now want to do
something a bit different, or at least try.
The purpose of
the VI is to monitor a spinning wheel with a video camera. Some times
we monitor one wheel, sometimes we monitor up to 12 wheels, each with
its own camera.
I have a parent VI that sets up the
parameters for testing (number of wheels, Camera number for each wheel
etc). It then call a subvi that loads the camera settings,and proceeds
to 'watch' the spinning wheel and make some machine vision measurements
based on the images. This proceeds for 10 minutes, then the VI does
some final calculations and closes and 'passes' the measurement data
back to the parent VI. If there is more than one wheel, it then calls
the same VI with the parameters for the next wheel.
What I
want to do is have the parent VI call many copies of my same subvi at
the same time, so that multiple wheels are being monitored at the same
time, not one after the other. I can't figure out how best to do this.
To date I have not used global variables, or libraries in Labview,
maybe these would make my problem easier. When I have needed more than
one camera at a time, I have opened and closed them in the same VI;
however, in this case I could need as many as 12, making the code really
ugly.
I could pull all the timing out of the subvi and
move it to the parent VI. I would also need tomove the open and close
camera portion of the subvi to the parent vi. But this approach will
make my code really ugly (which isn't the best to begin with!). So I
am looking for ways to approach the problem..
Cheers,
Andre
