HEIDENHAIN TNC 128 (77184x-02) - Manual (Page 287)

Datum setting without a 3-D touch probe 11.4
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TNC 128 | User's Manual HEIDENHAIN Conversational Programming | 5/2014
287
Datum management with the preset table
You should definitely use the preset table if:
Up to now you have been working with older TNC
controls with REF-based datum tables
The preset table can contain any number of lines
(datums). To optimize the file size and the processing
speed, you should use only as many lines as you
need for datum management.
For safety reasons, new lines can be inserted only at
the end of the preset table.