Siemens Sinumerik 840D sl Programming Manual page 685

Restrictions
• It is not possible to switch the geometry axes over during:
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• If the geometry axis and the channel axis have the same name, it is not possible to change
the particular geometry axis.
• None of the axes involved in the changeover may be involved in an action that can go
beyond the block limits – e.g.type A positioning axes or for following axes.
• Geometry axes can only be replaced using the command GEOAX if they were already
available when the system was powered-up (this means that no new ones can be
defined).
• An alarm is output if an attempt is made to replace an axis with GEOAX while executing the
contour table (CONTPRON, CONTDCON).
Supplementary conditions
Axis state after replacing
An axis replaced by the changeover in the geometry axis group can be programmed as
supplementary axis after the changeover operation via its channel axis names.
Frames, protection zones, working area limits
All frames, protection zones and working area limits are deleted after changing over the
geometry axes.
Polar coordinates
Replacing the geometry axes with GEOAX sets analog to a level change with G17-G19, the
modal polar coordinates to a value of 0.
DRF, ZO
A possible handwheel offset (DRF) or an external zero offset (ZO) remains effective after the
changeover.
Basic configuration of the geometry axes
The GEOAX() command calls the basic configuration of the geometry axis group.
The system automatically changes back to the basic configuration after POWER ON and
when changing over into the "reference point approach" mode.
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
Active transformation
Active spline interpolation
Active tool radius compensation
Active fine tool compensation
14.2 Replaceable geometry axes (GEOAX)
Additional functions
685