Siemens SINUMERIK 840D sl Function Manual page 196

B1: Continuous-path mode, Exact stop, Look Ahead
4.3 Continuous-path mode
Value
2xxx:
3xxx:
4xxx:
5xxx:
Ten thousands digit
0xxxx
1xxxx
When specifying the maximum axial deviations (MD33100 $MA_COMPRESS_POS_TOL) or
the maximum rounding distance (ADIS / ADISPOS) the available rounding path is normally
not used, if permitted by the dynamics of the axes involved. Through this, the length of the
rounding path depends on the active path feedrate. In case of lower path speeds, one gets
lower deviations from the programmed contours. However, it can be set that in these cases
the specified maximum axial deviation or the specified rounding distance is utilized, if possible.
In this case the deviations depend on the programmed contour independent of the
programmed path feedrate.
Note
Apart from the ones mentioned, the following limitation can also become active additionally:
The rounding distance cannot exceed half the length of the original participating blocks.
196
Input the maximum possible frequencies of each axis in the rounding area using the ma‐
chine data:
MD32440 $MA_LOOKAH_FREQUENCY (smoothing frequency for LookAhead)
The rounding area is defined so that no frequencies in excess of the specified maximum
can occur while the rounding motion is in progress.
Any axis that has a velocity jump at a corner traverses around the corner with the maximum
possible dynamic response (maximum acceleration and maximum jerk).
SOFT:
If SOFT is active, the maximum acceleration and the maximum jerk of each axis is main‐
tained.
BRISK:
If BRISK is active, only the maximum acceleration and not the maximum jerk of each axis
is maintained.
With this setting, neither the maximum deviations nor the rounding distance are checked.
The resulting deviations or rounding distances are determined exclusively by the dynamic
limits of the respective axis and the current path velocity.
As in case of 0xxx, the maximum deviations of each axis specified with the following ma‐
chine data are used:
MD33100 $MA_COMPRESS_POS_TOL
Contrary to 0xxx, the specified tolerance is also utilized, if possible. Therefore, the axis does
not attain its maximum possible dynamics.
As in case of 1xxx, the maximum possible rounding path is specified through programming
of ADIS=... or ADISPOS= respectively.
Contrary to 1xxx, the specified rounding path is also utilized, if possible. Therefore, the axes
involved do not attain their maximum possible dynamics.
The velocity profiles of the axes in the rounding area are determined without jerk limiting
for BRISK and with jerk limiting for SOFT.
The velocity profiles of the axes in the rounding area are always determined with jerk limit‐
ing, regardless of whether BRISK or SOFT is active.
Meaning
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic Functions