Siemens SINUMERIK 840D sl Function Manual page 354

Compensations (K3)
5.4 Interpolatory compensation
Compensation interpolation points
For every machine axis and for every measuring system (if a 2nd measuring system is
installed), the number of reserved interpolation points of the compensation table must be
defined and the necessary memory reserved with the following machine data:
MD38000 $MA_MM_ENC_COMP_MAX_POINTS
(number of interpolation points for interpolat. compensation (SRAM))
MD38000 $MA_MM_ENC_COMP_MAX_POINTS[e,AXi]
with:
AXi = axis name, e.g. X1, Y1, Z1
e = measuring system
e = 0: 1. measuring system, e = 1: 2. Measuring system
Compensation table
The position-related compensation values are stored in the form of system variables for the
relevant axis in the compensation table.
The following measuring-system-specific parameters must be set for the table (see diagram
below):
● Compensation value for interpolation point N in compensation table
Note
The first and last compensation values remain active over the entire traversing range, i.e.
these values should be set to "0" if the compensation table does not cover the entire
traversing range.
● Interpolation point distance ($AA_ENC_COMP_STEP[e,AXi])
354
($AA_ENC_COMP [e,N,AXi])
For every individual interpolation point (axis position) the compensation value must be
entered in the table.
Interpolation point N is limited by the number of possible interpolation points in the
relevant compensation table:
(MD38000 $MA_MM_ENC_COMP_MAX_POINTS
(number of interpolation points for interpolat. compensation (SRAM))
The magnitude of the compensation value is not limited.
Permissible range of N: 0 ≤ N < MD38000 -1
The distance between interpolation points corresponds to the distance between the
compensation values in the relevant compensation table (see above for meaning of e and
AXi).
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions