Siemens SINUMERIK 840D sl Programming Manual page 296

Fundamentals
2.11 Path action
Continuous-path mode is not suitable if:
● A contour needs to be traversed precisely
● An absolutely constant velocity is required
Note
Continuous-path mode is interrupted by blocks which trigger a preprocessing stop implicitly,
e.g. due to:
● Access to specific machine status data ($A...)
● Auxiliary function outputs
Syntax
G64 ...
G641 ADIS=...
G641 ADISPOS=...
G642 ...
G643 ...
G644 ...
G645 ...
Meaning
G64:
G641:
ADIS=... :
ADISPOS=... :
G642:
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Continuous-path mode with reduced velocity as per the overload factor
Continuous-path mode with smoothing as per distance criterion
Distance criterion with G641 for path functions G1, G2, G3, etc.
Distance criterion with G641 for rapid traverse G0
The distance criterion (= rounding clearance) ADIS or ADISPOS describes the
maximum distance the rounding block may cover before the end of the block, or
the distance after the end of block within which the rounding block must be
terminated respectively.
Note:
If ADIS/ADISPOS is not programmed, a value of "zero" applies and the travers‐
ing behavior therefore corresponds to G64. The rounding clearance is automat‐
ically reduced (by up to 36%) for short traversing distances.
Continuous-path mode with smoothing within the defined tolerances
In this mode, under normal circumstances smoothing takes place within the
maximum permissible path deviation. However, instead of these axis-specific
tolerances, observation of the maximum contour deviation (contour tolerance) or
the maximum angular deviation of the tool orientation (orientation tolerance) can
be configured.
Note:
Expansion to include contour and orientation tolerance is only supported on
systems featuring the "Polynomial interpolation" option.
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
NC programming