HEIDENHAIN 530 (340 49x-07) Pilot - Manual (Page 154)

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Unit 70 Positioning
This unit is used to define a positioning movement that the TNC should
run between any units.
Parameters:
U Approach end position : If desired, enter a position to be approached
by the TNC. Positioning sequence: First the tool axis (Z), then the
machining plane (X/Y)
U Workpiece reference system : Coordinates entered are referenced to
the active workpiece datum
U M91 : Coordinates entered are referenced to the machine datum (M91)
U M92 : Coordinates entered are referenced to a machine-set position
(M92) defined by the machine manufacturer