Cards hand VI are not updated until end of sub VI

I have 1 main VI calling several Sub screws in sequential order. The problem which I am facing is that real-time data created by one under that VI is not displayed in the hand VI UNTIL the sub VI ends.

The sub VI: in a While loop, an engine step by step is executed until a final position or charge threshold has been reached. The motor drive NI MID-7604 and NI 7340 motion controller are used for the two movements of the acquisition of stepper and the load cell data. The current position of the stepper motor and the load cell value returned permanently until the loop ends. I connected the variables corresponding to the position and load from within the While loop, as well as created global variables that are both inside and out of the While loop. Once the program is completed, a Boolean value is set to true, which is used by the main move program.

Main VI: the main program consistes of sequential images. Within the framework established by the Subvi above, VI sub is called with 4 inputs and 3 outputs (true/false condition finished and load and position settings). Also some time ago loop containing the two graphs corresponding to the position and load, as well as global variables (related to the graphs as well). It's just an attempt to see what works, of course, I want only 1 set of graphs. The condition for the while loop is true/false condition issued by the sub VI, and I know that the condition is set to false before the frame of the sequence.

In the Main VI that I tried put the global variables in a While loop, out of a While loop, both the Globals and the void VI in a While loop and placing the globals outside of the sequence. It goes same for no global variables that are related to the sub VI connectors. It appears as well as part of the sequence, the while loop containing the desired graphics is not started until the end of the Sub VI (I added a counter of debugging and she never increments).

If nothing is in a time loop, just the latest data points are graphically represented once the sub VI ends. If there is a while loop is nothing in graphic form.

If you have any suggestions I would be very happy.

Hello

It is a very basic question about the principles of data streams in LabVIEW. I suggest asking this question in forums of LabVIEW. You will get good responses and suggestions there. I also suggest that you post your vi there, because it makes things much more clear that describing it with words.

Thank you

Jochen

Tags: NI Hardware

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