Siemens Sinumerik 840D sl Programming Manual page 313

Note
ATRANS can be used to program an offset to be added to existing frames.
ATRANS X... Y... Z...
Translation through the offset values programmed in the specified axis directions. The currently
set or last programmed zero point is used as the reference.
Fundamentals
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Coordinate transformations (frames)
13.3 Programmable zero offset
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