Problems with the transmission of data between the screws

Hi all.

I have a question where my program slows considerably during the race.

The program is a producer-consumer, where I have the main consumer loops and loops producer for USE comms, measure the output power, input for measuring the power, thermal control, etc..

Regarding the issue, the measures of output loop takes readings and transmits the data to a separate VI which remains running (measure of output processor). This VI summarizes and on average the data and also displays data for the operator to see details if necessary. The operator shows and hides the front panel of this VI with a button on the main program. This VI also returns the summary data to the main VI, where it is read by my loop of consumer.

The main measures output VI loop takes about 200mS to run when the program is first started. Less than a minute, it is 400 MS, and it's all downhill from there.

I've isolated the problem to the way I pass data back (I think). I couldn't find a way to pass the reference of the queue between two screws not connected by wires. I open a reference to the VI processor and use Ctrl Val.Set and Get to pass the data back. If I take the intersection of the Subvi data, there is no slowdown.

My questions are:

(1) why the data passing by invoking a node of the control on the target would cause the downturn?

(2) how would I get/pass information of queue between the two screws are not connected?

(3) Alternately, could I start the VI processor in my main program, run and pass data in and out of it? I want to keep it running, because it is also part of the user interface.

I don't know that I have not explained this very clearly. I took some screenshots of my code, but don't see how to download here.

Thanks in advance,

Jim


Tags: NI Software

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