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Slow DI response

Hi Jim,

 


@JimMarihew wrote:

But it's set to read 10 samples in the TC task.


The setting in the task definition is irrelevant when you use DAQmxRead in "1 sample" mode: you request one sample, you get one sample!

 


@JimMarihew wrote:

The DI was just added yesterday.  Before that it ran for hours with no errors.  Right now I am running it with the DI task disabled and it is over 40k iterations without the error.


So you have a loop running fast enough to handle those 100 S/s for the TC task even with reading one sample per iteration (or: less than 10ms execution time per iteration). Now you added more code, which increases the execution time per iteration to >10ms: Now the TC task will give a "buffer overrun error" after some time/iterations…

 

Again:

Run all those DAQmx tasks in parallel. Don't chain them (THINK DATAFLOW!) due to using a single error wire from one to the next!

I still recommend to place each task in its own loop…

Best regards,
GerdW


using LV2016/2019/2021 on Win10/11+cRIO, TestStand2016/2019
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