Siemens Sinumerik 840D sl Programming Manual page 686

Additional functions
14.2 Replaceable geometry axes (GEOAX)
Tool length compensation
An active tool length compensation is also effective after the changeover operation. However,
for geometry axes that have been newly added or those where the position has been
replaced, it is still considered not to have been moved through. For the first motion command
for these geometry axes, the resulting traversing distance correspondingly comprises the sum
of the tool length compensation and the programmed traversing distance.
Geometry axes, which retain their position in the axis group after a replacement operation,
also retain their status with respect to tool length compensation.
Geometry axis configuration for active transformation
The geometry axis configuration applicable in an active transformation (defined using
machine data) cannot be changed using the function "replaceable geometry axes".
Should it be necessary to modify the geometry axis configuration in conjunction with
transformations, then this is only possible using an additional transformation.
A geometry axis configuration changed using GEOAX is deleted by activating a transformation.
If the machine data settings for the transformation do not match those for changing over
geometry axes, then the settings in the transformation have priority.
Example:
One transformation active. According to the machine data, the transformation should be kept
for a reset; however, at the same time, for a reset, the basic configuration of geometry axes
should be established. In this particular case, the geometry axis configuration that was
defined with the transformation is kept.
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Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
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