KEB COMBIVERT F5 Reference Manual page 248

FB - Field Bus Parameters
FB55
Software Filter
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By using FB55, the fieldbus input speed can be filtered. This allows for the
keypad operator to have an interpolation between the values that are being
given over the fieldbus. This allows for a less jagged response inside of the
inverter due to the update rate being 5 ms between keypad operator and
inverter, whereas the update rate between the controller and keypad operator
can be much longer.
The FB55 Software Filter is the amount of time in milliseconds in which the
filter will average over. If this is at least twice the input frequency (eg. serial
update time), then the keypad operator will be generating a new value for the
inverter during the acceleration and deceleration periods. If there is a telegram
loss, then the inverter will still receive a new value and the disturbance will
not be as great.
As a note, the LX11 Reference Splitting can also be used for interpolation of the
serial profile and is typically set at twice the serial update time, in milliseconds.