Altivar ATV320 does not have a built-in potentiometer. It has a rotary knob, that under certain configurations can be used for entering reference speed.
If FR1=LCC [HMI] then the rotary knob is used as a frequency reference and so the value of frequency reference can be read from the LFR variable or FRH (frequency reference before ramp)
To read LFR by ATV logic, use an "ADL container", see printscreen. The range of LFR is -599.9 to +599.9

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