HEIDENHAIN iTNC 530 (340 49x-05) Pilot - Manual (Page 142)

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Definin
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Machining Operations
Unit 70 Positioning unit
With this unit you can define a positioning that the TNC should run
between any units.
Parameters:
 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)
 Workpiece reference system : Coordinates entered reference the
active workpiece datum
 M91 : Coordinates entered reference the machine datum (M91)
 M92 : Coordinates entered reference a machine-set position (M92)
defined by the machine manufacturer