HEIDENHAIN iTNC 530 (340 49x-02) Pilot - Manual (Page 23)

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When you edit contours you can also position the cursor with the orange
axis keys so that the coordinate entry is identical to the conversational
entry. You can also switch between absolute and incremental or
Cartesian and polar coordinate programming with the relevant plain-
language keys.
Function when the form is active (right side of screen) Key
Select input field for X axis
Select input field for Y axis
Select input field for Z axis
Switching between incremental and absolute input
Switching between Cartesian and polar coordinate input