Siemens SINUMERIK 840D sl Function Manual page 741

Four modes can be set via machine data:
● MD10602 $MN_FRAME_GEOAX_CHANGE_MODE = 0
The current complete frame is deleted when geometry axes are switched over, when
transformations are selected and deselected, and on GEOAX().
The modified geometry axis configuration is not used until a new frame is activated.
● MD10602 $MN_FRAME_GEOAX_CHANGE_MODE = 1
The current complete frame is calculated again when the geometry axes are switched over,
and the translations, scalings and mirrorings of the new geometry axes are effective. The
rotations of the geometry axes which were programmed before the switchover remain
effective for the new geometry axes.
For TRANSMIT, TRACYL and TRAANG, see Section "Frame for selection and deselection of
transformations (Page 743)".
● MD10602 $MN_FRAME_GEOAX_CHANGE_MODE = 2
The current complete frame is calculated again when the geometry axes are switched over,
and the translations, scalings and mirrorings of the new geometry axes are effective. If
rotations are active in the current basic frames, the current settable frame or the
programmable frame before the switchover, it is aborted with the alarm "Frame: Geometry
axis switchover not allowed".
For TRANSMIT, TRACYL and TRAANG, see Section "Frame for selection and deselection of
transformations (Page 743)".
● MD10602 $MN_FRAME_GEOAX_CHANGE_MODE = 3
The current frame is deleted when selecting and deselecting transformations.
With GEOAX(), the current complete frame is calculated again and the translations, scalings
and mirrorings of the new geometry axes come into effect.
The rotations of the geometry axes which were programmed before the switchover remain
effective for the new geometry axes.
The workpiece geometry is described by a coordinate system that is formed by the geometry
axes. A channel axis is assigned to each geometry axis and a machine axis is assigned to
each channel axis. An axial frame exists for each machine axis and for each frame (system
frame, basic frame, settable frame, programmable frame). When a new machine axis is
assigned to a geometry axis, the axial frame components of the machine axis, such as
translations (coarse and fine), scaling and mirroring of the appropriate frame, are also applied.
The new geometry in the channel is then generated by the new contour frames resulting from
the new geometry axes (up to three in number).
The current valid frames are calculated again on the geometry axis switchover and a resulting
complete frame is generated. The data management frames are not included unless they are
activated.
Example:
The channel axis is to become a geometry axis x through geo axis substitution. The
substitution is to give the programmable frame a translation component of 10 in the x axis. The
current settable frame is to be retained.
MD10602 $MN_FRAME_GEOAX_CHANGE_MODE = 1
Program code
$P_UIFR[1] = CROT(x,10,y,20,z,30)
G54
TRANS a10
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
K2: Axis Types, Coordinate Systems, Frames
Comment
; Frame is retained after geo axis substitution.
; Settable frame becomes active.
; Axial offset of a is also substituted.
10.5 Frames
741