Siemens Sinumerik 840D sl Programming Manual page 683

Examples
Example 1: Switching two axes alternating as geometry axis
A tool slide can be traversed using channel axes X1, Y1, Z1, Z2:
The geometry axes are configured so that after powering-up, initially Z1 is effective as 3rd
geometry axis under the geometry axis name "Z" and together with X1 and Y1 forms the
geometry axis group.
Axes Z1 an Z2 should now be used, alternating, as geometry axis Z in the part program:
Program code
...
N100 GEOAX(3,Z2)
N110 G1 ...
N120 GEOAX(3,Z1)
...
Example 2: Changing over the geometry axes for 6 channel axes
A machine has 6 channel axes with the names XX, YY, ZZ, U, V, W.
The basic setting of the geometry axis configuration via machine data is:
Channel axis XX = 1st geometry axis (X axis)
Channel axis YY = 2nd geometry axis (Y axis)
Channel axis ZZ = 3rd geometry axis (Z axis)
Job planning
Programming Manual, 02/2011, 6FC5398-2BP40-1BA0
14.2 Replaceable geometry axes (GEOAX)
Comments
; Channel axis Z2 acts as 3rd geometry axis (Z).
; Channel axis Z1 acts as 3rd geometry axis (Z).
Additional functions
683