HEIDENHAIN TNC 128 (77184x-01) - Manual (Page 286)

286 Manual operation and setup
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Datum management with the preset table
Saving the datums in the preset table
The preset table has the name PRESET.PR, and is saved in the directory
TNC:\table
. PRESET.PR is editable in the Manual Operation and El.
Handwheel modes only if the CHANGE PRESET soft key was pressed.
It is permitted to copy the preset table into another directory (for data
backup). Lines that were written by your machine tool builder are also
always write-protected in the copied tables. You therefore cannot edit
them.
Never change the number of lines in the copied tables! That could
cause problems when you want to reactivate the table.
To activate the preset table copied to another directory you have to
copy it back to the directory TNC:\table\.
There are two methods for saving datums and/or basic rotations in the
preset table:
 Via touch probe cycles in the Manual Operation and El. Handwheel
modes (see "Using the 3-D touch probe" on page 291)
 Manual entry (see description below)
You should definitely use the preset table if until 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.
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 PR MAN(0)
in the status display.