Siemens SINUMERIK 840D sl Function Manual page 356

Compensations (K3)
5.4 Interpolatory compensation
Note
Table parameters containing positional information are automatically converted when the
system of units is changed (when the setting in the following machine data is altered):
MD10240 $MN_SCALING_SYSTEM_IS_METRIC
(basic system metric)). The position information is always interpreted in the current
measuring system. Conversion must be implemented externally.
Automatic conversion of positional information can be configured by the setting in the
following machine data:
MD10260 $MN_CONVERT_SCALING_SYSTEM=1
External conversion is no longer necessary.
References: /FB1/ Function Manual, Basic Functions; Velocities, Setpoint-Actual Value
Systems, Closed-Loop Control (G2)
Example
The following example shows compensation value inputs for machine axis X1.
%_N_AX_EEC_INI
CHANDATA(1)
$AA_ENC_COMP[0,0,X1] = 0.0
$AA_ENC_COMP[0,1,X1] = 0.01
$AA_ENC_COMP[0,2,X1] = 0.012
$AA_ENC_COMP[0,800,X1] = -0.0
$AA_ENC_COMP_STEP[0,X1] = 1.0
$AA_ENC_COMP_MIN[0,X1] = -200.0
$AA_ENC_COMP_MAX[0,X1] = 600.0
$AA_ENC_COMP_IS_MODULO[0,X1] = 0 ; compensation without modulo function
M17
:
MD38000 $MM_ENC_COMP_MAX_POINTS ≥ 801
(number of interpolation points for interpolat. compensation (SRAM))
356
CAUTION
When the compensation values are entered it is important that all interpolation points be
assigned a position value within the defined range (i.e. no gaps). Otherwise, the
previous valid position value is used for these interpolation points.
; 1st compensation value (≙ interpolation point 0)
; +0μm
; 2nd compensation value (≙ interpolation point 1)
; +10μm
; 3rd compensation value (≙ interpolation point 2)
; +12μm
; last compensation value
; (≙ interpolation point 800)
; interpolation point distance 1.0 mm
; compensation starts at -200.0 mm
; compensation ends at +600.0 mm
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions