Siemens SINUMERIK 840Di sl Programming Manual page 244

Frames
6.4 Programmable rotation (ROT, AROT, RPL)
Plane change
Warning
If you program a change of plane (G17 to G19) after a rotation, the angles of rotation
programmed for the axes are retained and continue to apply in the new working plane. It is
therefore advisable to deactivate the rotation before a change of plane.
Deactivate rotation
For all axes: ROT (without axis parameter)
Caution
In both cases, all frame components of the previously programmed frame are reset.
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Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals