Siemens SINUMERIK 840D Function Manual page 378

B2: Acceleration and jerk
12.2 Functions
FIR filter (5)
A FIR lowpass filter requires that the following machine data are set:
● MD32407 $MA_AX_JERK_FIR_FREQ = (corner frequency (-6dB) of the axial FIR jerk filter
smoothing)
● MD32408 $MA_AX_JERK_FIR_ORDER (order of the filter for the axial FIR jerk filter
smoothing)
● MD32409 $MA_AX_JERK_FIR_ORDER (window type of the axial FIR jerk filter smoothing):
– Window type 0 does not use a window
– Window type 1 uses a Hamming window.
– Window type 2 uses a Blackman-Harris window.
– Window type 3 uses a Gauss window.
● MD38020 $MA_MM_CPREC_FIR_POINTS (number of points for characteristic
approximation of FIR filters for CPRECON)
The function "programmable contour accuracy" uses a table for approximation of the
inverse characteristic of FIR filters. The memory-configuring machine data MD38020
specifies the number of table values. The larger the value, the more precise the
approximation. The recommended value is the value of MD32407
$MA_AX_JERK_FIR_FREQ. If no value is entered, it is not possible to execute the function
and alarm 10990 is output.
Further information:
For information about "Programmable contour accuracy", see:
Function Manual Monitoring and Compensating; Contour tunnel monitoring >
Programmable contour accuracy
378
Axes and spindles
Function Manual, 06/2019, A5E47437747B AA