Siemens SINUMERIK 802D sl Programming Manual page 55

04.07
Example
G17 U0 Y0
Parallel axis U is activated, replacing the X axis within the G17 plane.
Explanations
S The parallel axes command is emulated using the Siemens function
GEOAX(..,..). With the help of this function, a geometrical axis can be
exchanged by any available channel axis.
S For each of the geometrical axes, a related parallel axis can be determined
using machine data
$MC_EX--TERN_PARALLEL_GEOAX[].
S Only axes related to the programmed plane (G17, G18, G19) can be
exchanged.
S Usually, when exchanging axes, all offsets (frames) except for handwheel and
external offsets, work area limitation and protection zones are cleared. Be sure
to set the following machine data to prevent from clearing such values:
Offsets (frames)
$MN_FRAME_GEOAX_CHANGE_MODE
Protection zones
$MC_PROTA--REA_GEOAX_CHANGE_MODE
Work area limitation
$MN_WALIM_GEOAX_CHANGE_MODE
S Refer to machine data description for detail.
S Alarm 12726 is issued, if a basic axis is programmed together with its parallel
axis in a plane selection command.
© Siemens AG 2007 All rights reserved
SINUMERIK 802D sl/840D/840D sl/840Di/840Di sl/810D ISO Milling (PGM) - - 04.07 Edition
Movement Control Commands
3.1 The coordinate system
3-55