Auxiliary Function Outputs; Continuous-Path Mode (G64, G641, G642, G643, G644, G645, Adis, Adispos) - Siemens SINUMERIK 840D sl Programming Manual

Path action

11.2 Continuous-path mode (G64, G641, G642, G643, G644, G645, ADIS, ADISPOS)

11.2 Continuous-path mode (G64, G641, G642, G643, G644, G645, ADIS,
ADISPOS)
Function
In continuous-path mode, the path velocity at the end of the block (for the block change) is not
decelerated to a level which would permit the fulfillment of an exact stop criterion. The
objective of this mode is, in fact, to avoid rapid deceleration of the path axes at the block-
change point so that the axis velocity remains as constant as possible when the program
moves to the next block. To achieve this objective, the "LookAhead" function is also activated
when continuous-path mode is selected.
Continuous­path mode with smoothing facilitates the tangential shaping and/or smoothing of
angular block transitions caused by local changes in the programmed contour.
Continuous­path operation:
• Rounds the contour
• Reduces machining times by eliminating braking and acceleration processes that are
required to fulfill the exact-stop criterion
• Improves cutting conditions because of the more constant velocity
Continuous­path mode is suitable if:
• A contour needs to be traversed as quickly as possible (e.g. with rapid traverse)
• The exact contour may deviate from the programmed contour within a specific tolerance
for the purpose of obtaining a continuous contour
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...
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Programming Manual, 09/2011, 6FC5398-1BP40-2BA0
Fundamentals