9144 EtherCAT refresh rate

Hi all, I am designing an application that will make use of several 9144 chassis for remote i/o EtherCAT. I need a minimum of a 2 kHz update rate with ~ 40-50 for this application on the EtherCAT ring channels (16 bit). After reading the EtherCAT documentation available on the Web site of NEITHER, it appears that the update rate is primarily limited by the analysis of the control engine because it is treatment in the real-time operating system and not the FPGA.

I also saw the benchmark EtherCAT here: http://www.ni.com/white-paper/52642/en/

Unfortunately this reference does not include the most recent RIOs Compact. Does anyone have experience with rates updated on the most recent cRIOs based on Linux (906 x series, x 903 series)? For those who have done this before, 2 kHz makes it seem like a reasonable rate update for 50 channels (over 3-4 EtherCAT frame) using one of these more recent cRIOs?

Shansen,

I think that you should be able to achieve rates of 2 kHz with new cRIO-903 x performance. However you must consider that there are other factors which could affect/bottleneck your performance.

-Architecture code is great. Inefficient code can cause a high CPU load and affect your timing.

-Module update rate. Your slower module usually defines the "maximum speed" of your system.

Tricks like disable debugging for VI mode or request a RT improves performance as well.

Tags: NI Products

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