What is the reason make i lose data?

Question

I using a lot global variable in main vi, to control and display some nummeric in test.vi, and display graph of test.vi.
Test.vi take the value from 2 vi: value.vi and position.vi..
Test.vi, Value.vi and Position.vi using Queue Operations functions
I want to use main vi to read the iterationof value.vi
when I use run main vi , the number indicator in main, not save with indicator in value.vi. it's only same with test.vi. And it's slower 2 time than in value.vi
But when I run only test.vi. the indicator in test.vi is almost same with in value.vi ( but it's different = 1. if indicator show in value.vi = 10, i in indicator in test
sao 9)
Any hint for this problem?Thx

Answer 1

ha noi,
It looks like the individual components of your project are working:  the read_sensor.vi is queueing the index, the test.vi is dequeueing and writing to the shared variable, and the main VI is reading from the shared variable.  The difference in performance you are seeing between running the test.vi and running the main.vi is probably due to the amount of other code that you have running in the main VI.  Your application uses a lot of parallel loops, so it is difficult to guarantee how often different sections of code will be run.  In this case, it seems that your read_sensor.vi continually queues elements, but the test.vi is not reading elements from the queue fast enough to keep up.
Devin K
Systems Engineering - RTT & HIL