HEIDENHAIN iTNC 530 (34049x-08) ISO programming - Manual (Page 484)

484 Manual operation and setup
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Basic rotations from the preset table rotate the coordinate
system about the datum, which is shown in the same line
as the basic rotation.
When setting a datum, the TNC checks whether the
positions of the tilting axes match the corresponding
values of the 3D ROT menu (depending on the setting in
the kinematics table). Therefore:
 If the "Tilt working plane" function is not active, the
position display for the rotary axes must be = 0° (zero
the rotary axes if necessary).
 If the "Tilt working plane" function is active, the position
displays for the rotary axes must match the angles
entered in the 3-D ROT menu.
The machine manufacturer can lock any lines in the preset
table in order to place fixed datums there (e.g. a center
point for a rotary table). Such lines in the preset table are
shown in a different color (default: red).
The line 0 in the preset table is write protected. In line 0,
the TNC always saves the datum that you most recently
set manually via the axis keys or via soft key. If the datum
set manually is active, the TNC displays the text MAN(0) in
the status display
If you automatically set the TNC display with the touch-
probe cycles for presetting, then the TNC does not store
these values in line 0.
Danger of collision!
Keep in mind that moving an indexing feature on your
machine table (realized by changing the kinematics
description) may also shift datums that are not directly
connected to the indexing feature.