HEIDENHAIN iTNC 530 (340 422) ISO programming - Manual (Page 58)

Activate preset
Confirm activation of the datum. The TNC sets the
display and—if defined—the basic rotation
Leave the preset table
Activating the datum from the preset table in an NC program
Use Cycle G247 in order to activate datums from the preset table
during program run. In Cycle G247 you simply define the number of
the datum to be activated (see “DATUM SETTING (Cycle G247)” on
page 384).