Two timed loops in parallel

[chrisstef98]

Im working on a simple project where i need to have two loops. One updates a numeric indicator every 10ms and the other updates a numeric indicator every 100ms and stop button is supposed to stop both loops. 

Problem is when i use two timed loops in parallel only one runs and the other not.

[Bob_Schor]

Remember the Principle of Data Flow, which is the central "Rule" of LabVIEW -- with (very) few exceptions, no Structure (such as a Timed Loop) can be entered until data are present on all of its inputs, and until a Structure (such as a Timed Loop) exits, data will not be presented on any of its outputs.

Your two Timed Loops are connected (serially) by a pair of wires.  Until the first loop finishes, the second cannot begin.  The other interesting "feature" is that you have a feedback node (which I rarely use, as I find their metaphor confusing to me) seems to be connected "backwards", input side connected to an input, and output side connected to an output (note -- it might be correct, but, as I said, I find it confusing enough that I haven't "mastered" its use).

Bob Schor

[altenbach]

You already learned about dataflow and data dependency, so here are a few more observations:

• Equal comparisons on DBL values are dangerous. Maybe you want to change to integers instead?
• If you need to pick between three possible strings for an indicator, zero or one case structure is sufficient.
• You don't really need two loops. You can update the other indicator every 5th iteration.
• I doubt you need a timed loop. A plain while loop with a wait would be fine here. (not shown)
• Please check the help on "elapsed time". Whatever you have wired to the target time ("[i]" or "high resolution relative seconds") makes absolutely no sense!
• You don't really need the elapsed time express VI.
• Most likely your feedback node got auto-inserted because you created a wire loop, so don't worry about it and just delete it.
• Instead of three different comparisons (>, =, <), you can subtract the two values and see if the sign of the result is -1, 0, or 1.
• Learn about arrays. they greatly simplify the code.
• If you have three LEDs where only one can be TRUE at any given time, a radiobutton indicator would be more reasonable (not shown).

The attached modification is probably not the exact solution you want, but study it. Maybe it can give you some general ideas.