Siemens SINUMERIK 840D sl Function Manual page 851

The following machine data can be used to set whether the ENS is with or without the
programmable frame, the transformation frame and $P_ISO4FRAME:
MD24030 $MC_FRAME_ACS_SET (setting of the ENS coordinate system)
As default, the value 1 is set.
Reconfiguring the SZS affects all SZS actual-value displays and the $AA_IEN[axis] system
variables. Traversing geometry axes in JOG mode in the SZS also depends on the
configuration.
Basic logic functions: Axes, coordinate systems, frames (K2)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0
Detailed description
2.4 Frames
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