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The maximum hm2 encoder count rate depends on the sample frequency
At the maximum 7I90HD encoder sample frequency of 100 MHz, the built in 3 clock (filter off)
input digital filter means that a quadrature  input signal must last at least 30 ns to be detected.
This means an approximate maximum count rate of ~60 MHz. Practical
real world signal integrity  considerations limit maximum count rates to about 10 MHz.

Dear elovalvo
Did you install successfully igh ethercat for Rasp 5?
I tried to install, but I got the error.
This error is " modprobe: FATAL: Module ec_master not found in directory /lib/modules/6.6.21-rpi999-rpi-2712"

The 7i90HD manual mentions a medium speed real time interface (around 1 Mbyte/sec) in EPP. However, I'm specifically interested in the maximum encoder count rate. Could someone please provide this information?.

Thank you.