Improvement of timeliness

HI again,

I enclose a developed VI which takes in data from an external source (engine in this case) and stores the data. However, its delivery rate is very slow.

I guess it happens so because I write data on the hard drive in the "block average VI. I tried using shift registers, but they do not seem to work in this case.

Please see the attached VI and suggest how to improve his speed because it will be used for the acquisition of data high-speed.

Thank you!

Dheeraj,

Is seeing several things that can contribute to your slow execution.

1. in the DT.vi channels you create channels, set up the calendar, start the task, read the data and stop the task.  Configuration does not change from one iteration to another so why repeat it? Implemented for continuous play and move everyuhing except the DAQmx Read out of the loop.

2. as you work with tables, why not read the data as a table 2D rather than an array of waveforms, which then converted to dynamic data, then back to berries?  A single Index Array function would replace the Signal Split and all the convert dynamic Date primitives.  In addition with the array of Index it is clearly evident what is happening. Dynamic functions and data structures tend to hide things behind configuration dialog boxes.

3. the Express calculators are probably quite slow compared to the screw assessment polynomial which act directly on the numeric data types.

4. the average Dt.vi of the block calculated exactly the same average as the average instant DT.vi, and then a little more.  Why the calculation twice?  Just make the average instant as an additional output of the DT.vi block average production and eliminate average instantaneous (or use it as a block average suVI.

5. you have several Quotient and the rest of the functions and comparison functions that duplicate the calculations.  Simply use the result of one of them in multiple places.

6. If the values of the controls cannot change in the course of a race, move them out of the loop.  The loop didn't need to read every time.  The values are treated as constants inside the loop.  Obviously Stop must be inside the loop because it changes during a run.

7 son run behind other objects and son achieve the difficult to read diagram.

See the image below for a purified to the top of DT version.  At the top of the loop is a construction showing what I was talking about points 2 and 3.

Lynn

Tags: NI Software

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