"Newbie" Unable to run two actions at the same time please help

Hello
I'm a newbie (2 weeks) on Labview, so I hope my problem will sound easy for some of you.
I want to read a file and at the same time get the reading from my sensors (4 sensors).
My program is working when I do each thing in a different program but when I add them the program only read the text file and stop reading the sensor signals...I attach the program file.
The goal is with the text file to add an exact time for each sensor signal I record.
Is there any other possibilities to include a time with the sensors signals recorded ? I need to do this to synchronize the sensors values with CAM program.
Thanks
/Xavier
Ps I used a scan rate of 12000/s but I try 1000/s
and the sensor acquisition is still not working
Attachments:
test3Rdif2802.vi ‏493 KB
readfile.txt ‏195 KB
sensoracquisition30s.txt ‏210 KB

from a glance at your code, it appears that you have nested a loop to read your file, inside a loop to read your sensors. this means the nested loop to read your file must finish before the outside loop to read your sensors can run through another iteration. what you want to do is separate the two loops to run independently of each other (in parallel). use a global variable to know when to stop the loop (if they need to stop at the same time) and if you need to pass data between the loops use a queue (easiest) or you can also use globals with semaphores.

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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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"Newbie" Unable to run two actions at the same time please help

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