Siemens SINUMERIK 840D sl Function Manual page 772

P2: Positioning axes
11.3 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.
Selection of interpolation type
The interpolation type that should effective for G0 is adjusted with the following machine
data:
MD20730 $MC_G0_LINEAR_MODE (interpolation response in G0)
772
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, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions