Siemens SINUMERIK 840D sl Function Manual page 364

Compensations (K3)
5.4 Interpolatory compensation
● Compensation with modulo function ($AN_CEC_IS_MODULO[t])
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.
With setting:
MD10260 $MN_CONVERT_SCALING_SYSTEM=1 (basic system switchover active)
the system of units can be configured in the following machine data:
MD32711 $MA_CEC_SCALING_SYSTEM (system of units of sag compensation)
External conversions of position information are no longer necessary with a measuring
system change.
References:
/FB1/ Description of Functions, Basic machine; Velocities, Setpoint-Actual Value
Systems, Closed-Loop Control (G2)
364
When compensation with modulo function is activated, the compensation table is
repeated cyclically, i.e. the compensation value at position $AN_CEC_MAX[t]
(interpolation point $AN_CEC[t,k]) is immediately followed by the compensation value at
position $AN_CEC_MIN[t] (interpolation point $AN_CEC[t,0]).
These two compensation values should be the same as otherwise the compensation
value jumps from MAX to MIN at the transition point and vice versa.
$AN_CEC_IS_MODULO[t]= 0: Compensation without modulo function
$AN_CEC_IS_MODULO[t]= 1: Compensation with modulo function
If modulo compensation is to be implemented with a modulo rotary axis as base axis, the
compensation table used has to be modulo calculated as well.
Example:
MD30300 $MA_IS_ROT_AX[AX1] = 1 ; rotary axis
MD30310 $MA_ROT_IS_MODULO[AX1] = 1 ; modulo 360°
$AN_CEC_INPUT_AXIS[0]=AX1
$AN_CEC_MIN[0]=0.0
$AN_CEC_MAX[0]=360.0
$AN_CEC_IS_MODULO[0]=1
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
Extended Functions