On ATV320, is it possible to read frequency of pulses on LI5 that is used as freq.input?

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How to read Frequency of pulses on LI5 used as freq. input on Altivar 320 frequency inverter?

Yes, it is possible. But it is necessary at first to assign this frequency input to one of the variables. For example parameter FR2=RP. (No need to use FR2 as frequency reference at all).
Then from the register (logical address 13306, can open 16#2067/9) it is possible to read the frequency of LI5 input.