How to configure the loop rates ?

[rishab_kr]

Hello,

I am trying to execute two time loop one at a rate of 1000 Hz and other at rate of 200 Hz. The problem I am facing right now is when I am executing the code they are not operating at the assigned frequency. Also I wanted to stop the loop execution when the 1st loop (200) Hz stops, the 2nd should also stop.   

 

[GerdW · Accepted solution]

Hi rishab,

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@rishab_kr wrote:

I am trying to execute two time loop one at a rate of 1000 Hz and other at rate of 200 Hz. The problem I am facing right now is when I am executing the code they are not operating at the assigned frequency.

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Again you failed in attaching all subVIs…

The loops can only iterate as fast as the code inside can be executed: which loop rates do you achieve in comparison to the "assigned frequency"? (THINK DATAFLOW!)

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@rishab_kr wrote:

Also I wanted to stop the loop execution when the 1st loop (200) Hz stops, the 2nd should also stop.

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Then you need to change the stop condition of the 2nd loop…

(Maybe another program structure might be useful: why do you need to output the same values 5 times per calculation of those values?)

General recommendation:

Cleanup the block diagram to use straight wires.

Never hide labels in the block diagram.

[rishab_kr]

Related to attaching VIs : I am not sure weather it will work or not in your system as it contain lots of file like FPGA and Sub VI.

I have shared the final one with one screenshot the upper time loop I executing at 1000 Hz and the lower one is at 200 Hz. Also I am not able to figure out how to stop the upper loop when the bottom one stops executing. 

Also I am not able to understand your question about the " why do you need to output the same values 5 times per calculation of those values" ?

I wanted to understand the possible reasons of such behavior, like the loop rates  ? 

I am really learning a lot out of your comments. Your comments are really crisp and to the point . Waiting for your another valuable guidance. 

Thanks in advanced.

[GerdW]

Hi rishab,

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@rishab_kr wrote:

I have shared the final one with one screenshot the upper time loop I executing at 1000 Hz and the lower one is at 200 Hz.

I wanted to understand the possible reasons of such behavior, like the loop rates  ? 

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You did not answer my question: which loop rates do you achieve?

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@rishab_kr wrote:

Also I am not able to figure out how to stop the upper loop when the bottom one stops executing. 

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You already know how to stop the loops in the first two sequence frames using the STOP button using a boolean function.

You know how to stop the TimedLoops based on the STOP/Stop buttons.

But now you don't know how to stop those loops based on conditions calculated from several boolean values???

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@rishab_kr wrote:

Also I am not able to understand your question about the " why do you need to output the same values 5 times per calculation of those values" ?

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One loop is calculating a matrix at (desired) 5ms intervals.

The other loop is using that matrix at (desired) 1ms intervals.

What happens inside the subVI so you need to use the same calculation result 5 times per calculation?