HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 249)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 249
4.13 Zer
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point shif
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4.13 Zero point shifts
You can program several zero shifts in one NC program. The
relationships of the coordinates (for blank/finished part, auxiliary
contours) are retained by the zero offset description.
G920 temporarily deactivates zero point shifts—G980 reactivates
them.
Overview of zero point shifts
G51:
 Relative shift
 Programmed shift
 Reference: Previously defined workpiece zero point
page 250
G56:
 Additive shift
 Programmed shift
 Reference: Workpiece zero point defined at present
page 251
G59:
 Absolute shift
 Programmed shift
 Reference: Machine zero point
page 252