Run two vi at the same time

I WANT TO HAVE A VI RUNNING (WHILE LOOP, COLLECTING DA DATA, OPERATING AN ACTIVE TEST, ETC.) AND WHILE THAT IS GOING ON, OPEN ANOTHER VI (FROM WITHIN THE MAIN PROGRAM) TO DO SOME SEPERATE FUNCTION (PRINT OUT A LOG REPORT, PREVIOUS TEST RESULTS, ETC.). BUT EVERY TIME I OPEN ANOTHER VI's WINDOW, THE MAIN PROGRAM WINDOW's WHILE LOOP STOPS LOOPING.
I AM SURE IT IS JUST A SIMPLE SETTING, BUT SO FAR HAVE NOT BEEN ABLE TO FIND THE RIGHT SETTING OR AN EXAMPLE OF TWO VI LOOPING AT THE SAME TIME.
THANK YOU FOR THE HELP.
DOGFACE

I HAVE ATTACHED A ZIPPED FILE CONTAINING TWO SAMPLE FILES (CARL1MAIN.VI AND CARL1SUB.VI) THAT SHOW WHAT I WAS TRYING TO DO. I HAVE BEEN USING TEST POINT AND HAVE RECENTLY SWITCHED OVER TO LABVIEW, SO I AM STILL LEARNING. I TOOK BOTH BASIC COURSES (AND SCHEDULING ADVANCED COURSES IN LABVIEW). BUT BECAUSE OF THE DIFFERENCES BETWEEN LABVIEW AND TEST POINT, I MIGHT BE STRUCTURING THIS WRONG.
I AM OPEN TO ANY SUGGESTIONS.
THANKS.
Attachments:
CARL1.zip ‏16 KB

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"smartlander" wrote in message
news:[email protected]..
> Hi
>
> I want to control speed of the rotating shaft and force applied by the
> pneumatic cylinder using two different PIDs from the same program.
> I managed to get two PIDs to work separatly using PID control loop
> VI`s supplied with labview 6.1 (I got Kc, I and D right, so there is
> no overshoot). When I try to run
both PIDs within my vi they don`t
> work. I again tried various gains and managed to get one PID to work
> but not the other. Then through trial and error I managed to get a
> second PID to work but I had to change refresh time of the FOR loop
> from 100msec to 1msec.
> Does anyone have experience with running two PIDs in the same program?
> Does the timing of the FOR loop influence PID contorller? Does
> equiring of other data while running PID has effect on the PID?
> I would really appreciate any comments/help. I am pretty thrustrated
> at this time
> Thanks

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Attachments:
test3Rdif2802.vi ‏493 KB
readfile.txt ‏195 KB
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