Siemens SINUMERIK 828D Programming Manual page 345

Note
The extent of smoothing of the contour transitions depends on the feedrate and the overload
factor. The overload factor can be set in MD32310 $MA_MAX_ACCEL_OVL_FACTOR.
Setting MD20490 $MC_IGNORE_OVL_FACTOR_FOR_ADIS means that block transitions
will always be rounded irrespective of the set overload factor.
The following points should be noted in order to prevent an undesired stop in path motion
(relief cutting):
● Auxiliary functions, which are enabled after the end of the movement or before the next
● Positioning axes always traverse according to the exact stop principle, positioning
However, intermediate blocks containing only comments, calculation blocks or subprogram
calls do not affect continuous-path mode.
Note
If
FGROUP
block transitions for those axes excluded from FGROUP; the control limits this change in
velocity to the permissible values set in MD32300 $MA_MAX_AX_ACCEL and MD32310
$MA_MAX_ACCEL_OVL_FACTOR. This braking operation can be avoided through the
application of a rounding function, which "smoothes" the specific positional interrelationship
between the path axes.
Fundamentals
Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
11.2 Continuous-path mode (G64, G641, G642, G643, G644, G645, ADIS, ADISPOS)
movement interrupt continuous-path mode (Exception: High-speed auxiliary functions).
window fine (as for
G601
mode is interrupted on the path axes.
does not contain all the path axes, there is often a step change in the velocity at
). If an NC block has to wait for positioning axes, continuous-path
Path action
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