Siemens SINUMERIK 840D sl Function Manual page 794

Positioning Axes (P2)
Motion behavior and interpolation functions
Linear interpolation is always performed in the following cases:
● For a G-code combination with G0 that does not allow positioning axis motion, e.g.:
● With a combination of G0 with G64
● when a compressor or transformation is active,
● in point-to-point (PTP) travel mode
● when a contour handwheel is selected (FD=0)
● in case of an active frame with rotation of geometry axes
● if nibbling is active for geometry axes
Non-linear interpolation
Features:
● Each path axis interpolates as a single axis (positioning axis) independently of the other
● The channel-specific delete distance-to-go command via the PLC and synchronized
In non-linear interpolation, with reference to the axial jerk:
● The setting of the concerned positioning axes BRISKA, SOFTA, DRIVEA
or
● the setting in the machine data:
The existing system variables which refer to the distance to go ($AC_PATH, $AC_PLTBB
and $AC_PLTEB) are supported.
As traversal of another contour is possible with non-linear interpolation, synchronized
actions that refer to coordinates of the original path may not be active.
794
G40, G41, G42, G96, G961 and MD20750 $MC_ALLOW_G0_IN_G96 == FALSE
axes at the rapid traverse velocity defined in the following machine data:
MD32000 $MA_MAX_AX_VELO
actions is applied to all positioning axes that were programmed as path axes.
MD32420 $MA_JOG_AND_POS_JERK_ENABLE
and
MD32430 $MA_JOG_AND_POS_MAX_JERK
CAUTION
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
Extended Functions