Siemens SINUMERIK 828D Function Manual page 196

B1: Continuous­path Mode, Exact Stop, LookAhead
3.4 Dynamic adaptations
The contour sampling factor is set with the machine data:
MD10682 $MN_CONTOUR_SAMPLING_FACTOR
The effective contour sampling time is calculated as follows:
T = f * T
s 1
where T = effective contour sampling time
s
:
T = Interpolation cycle time
1
f = Contour sampling factor (value from MD10682)
The default contour sampling factor is "1", i.e. the contour sampling time equals the interpolation cycle.
The contour sampling factor can be both greater or less than "1".
If a value less than "1" is set, monitoring of contour sampling precision is disabled.
The set sampling time may not be below the configured minimum contour sampling time:
MD10680 $MN_MIN_CONTOUR_SAMPLING_TIME
Note
MD10680 is specifically set for every controller model and cannot be changed.
Programming
Depending on the setting in machine data MD20606 $MC_PREPDYN_SMOOTHING_ON, "Free-form surface
mode: Basic functions" can be switched on and off in the part program by changing the active dynamic response
mode.
Example:
By assigning the parameters MD20606 $MC_PREPDYN_SMOOTHING_ON[2-4] = 1 and MD20606
$MC_PREPDYN_SMOOTHING_ON[0-1] = 0, the function can be switched on via the commands DYNROUGH,
DYNSEMIFIN, and DYNFINISH and switched off via the commands DYNNORM and DYNPOS.
See also
Rounding of tangential block transitions (G645) Rounding of tangential block transitions (G645) [Page 169]
Velocity-dependent jerk adaptation (axis­specific) Velocity-dependent jerk adaptation (axis­specific) [Page 241]
Free-form surface mode: Extension function Free-form surface mode: Extension function [Page 176]
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions