HEIDENHAIN iTNC 530 (340 49x-01) ISO programming - Manual (Page 245)

HEIDENHAIN iTNC 530 245
8.2 P
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Effect of the point tables with Cycles G210 to G215
The TNC interprets the points as an additional datum shift. If you want
to use the points defined in the point table as starting-point
coordinates, you must define the starting points and the workpiece
surface coordinate (Q203) in the respective milling cycle as 0.
Effect of the point tables with Cycles G251 to G254
The TNC interprets the points of the working plane as coordinates of
the cycle starting point. If you want to use the coordinate defined in
the point table for the spindle axis as the starting point coordinate, you
must define the workpiece surface coordinate (Q203) as 0.