HEIDENHAIN ITNC 530 - Datum setting on machines with spindle-head changing systems; Position display in a tilted system; Limitations on working with the tilting function

620 Manual Operation and Setup
14.10 Tilting the working plane (software option 1)
Datum setting on machines with spindle-head
changing systems
If your machine is equipped with a spindle head changer, you should
use the datum table to manage your datums. Datums saved in datum
tables account for the active machine kinematics (head geometry). If
you exchange heads, the TNC accounts for the new head dimensions
so that the active preset is retained.
Position display in a tilted system
The positions displayed in the status window (ACTL. and NOML.) are
referenced to the tilted coordinate system.
Limitations on working with the tilting function
 The probing function for basic rotation is not available if you have
activated the working plane function in the Manual Operation mode.
 The actual-position-capture function is not allowed if the tilted
working plane function is active.
 PLC positioning (determined by the machine tool builder) is not
possible.