Siemens SINUMERIK 840D sl Programming Manual page 441

Frame change
All statements, which refer exclusively to the base coordinate system, are permissible
(FRAME, tool radius compensation). However, a frame change with G91 (incremental
dimension) – unlike with an inactive transformation – is not handled separately. The
increment to be traveled is evaluated in the workpiece coordinate system of the new frame –
regardless of which frame was effective in the previous block.
Exceptions
Axes affected by the transformation cannot be used
● as a preset axis (alarm),
● for approaching a checkpoint (alarm),
● for referencing (alarm).
Job Planning
Programming Manual, 06/2009, 6FC5398-2BP20-0BA0
6.10 Constraints when selecting a transformation
Transformations
441