HEIDENHAIN 530 (340 49x-07) Pilot - Manual (Page 179)

179
Definin
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Mac
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ing P
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Defining a retraction height for positioning (FCL 3 function)
U Use the arrow keys to select any single position that is to be
approached at a height you define.
U Retraction height : Enter the absolute coordinate at which
the TNC is to approach this position. The TNC marks the
position with an additional circle.
The retraction height you define is always referenced to the
active datum.