Siemens SINUMERIK 840Di Function Manual page 166

Detailed Description
2.3 Continuous-path mode
Expansion
Rounding with G642 and G643 has been extended so that the length of the rounding
distance can be specified directly instead of entering the maximum tolerances.
As with G641, the language commands ADIS = ... for G01 and ADISPOS = ... for G00 are
used respectively for this purpose.
Machine data:
MD20480 SMOOTHING_MODE
determines whether G642, G643 or the maximum rounding length is specified.
The following applies:
SMOOTHING_MODE = x4
SMOOTHING_MODE = 4x
Profile for limit velocity
The hundred's place in machine data:
MD20480 SMOOTHING_MODE
can be used to control the use of a velocity profile during rounding.
Hundred's place:
< 100:
≥100:
1xx:
2xx:
Note
See also MD28530 MM_PATH_VELO_SEGMENTS.
2-18
G643 with ADIS or ADISPOS
G642 with ADIS or ADISPOS
A profile of the limit velocity is calculated within the rounding area, based on the
defined maximum values for acceleration and jerk on the participating axes or
path.
This can lead to an increase in the path velocity in the rounding area and
therefore to the acceleration of the participating axes.
A profile of the limit velocity is not calculated for rounding blocks with
G641/G642. A constant velocity limit is specified instead.
This prevents the participating axes being accelerated into the rounding area
during rounding with G641/G642. However, in certain cases, this setting can
cause the rounding blocks to be traversed too slowly, especially in large
rounding areas.
No velocity profile for G641
No velocity profile for G642
Continuous-Path Mode, Exact Stop, LookAhead (B1)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0