HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 198)

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4.16 Zero Point Shifts
You can program several zero point 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
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G53, G54, G55:
„ Relative shift
„ Shift from parameters
„ Reference: Previously defined workpiece zero point
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G56:
„ Additive shift
„ Programmed shift
„ Reference: Workpiece zero point defined at present
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G59:
„ Absolute shift
„ Programmed shift
„ Reference: Machine zero point
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