15-20 time of latency to see the changes in analog inputs
I inherited a program extremely complex. I find that I see 15-20 seconds latency on the changes to the analog inputs. I can't post the code - (it has more than 200 sub screw) but I have captured the relevant section in the long latency period of the changes.jpg of analog input attached.
I tried to change the sampling rate and see the same problem from 1 Hz to 25 Hz (limit of reliable sampling with this PC). I'm looking at indicators which are directly related to the acquisition of data Read.vi as evidenced by the big red arrow.
I modeled the nested struct in the template attached without latency problems.jpg. There is no perceptible latency but it duplicates the nested structures.
The only thing not shown is that there are several cases of Read.vi of data acquisition using the same physical changes but not of them are in the loops that need to run at the same time.
The data are consistent with the entries, just delayed.
The Signal processing device is a USB-6343. I am running these screws on LabVIEW 2011 edition.
Any ideas?
Yes, instead of getting just 1 sample buffer, try to get all the samples.
Then you can retrieve the most recent example of all the samples you get and take the rest of them.
Or you can change the configuration of taks for only once every time that you call the read function.
Tags: NI Software
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If you can't give us any VI we have difficulties with to help you.
Because I Donat knowledge how your program is mounted it is not easy to know where you should enter signals.
Here's a question similar to yours:
http://forums.NI.com/T5/LabVIEW/best-way-to-measure-time/TD-p/178704
and 2 external links:
http://www.ehow.com/how_8698983_measure-time-LabVIEW.html
http://objectmix.com/LabVIEW/385152-how-can-i-use-LabVIEW-measure-time-between-analog-pulses.html
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