HEIDENHAIN iTNC 530 (60642x-03) - Manual (Page 576)

576 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:\.
PRESET.PR is editable only in the Manual Operation and
Electronic Handwheel modes. In the Programming and Editing mode
you can only read the table, not edit it.
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:\.
There are several methods for saving datums and/or basic rotations in
the preset table:
 Through probing cycles in the Manual Operation or El. Handwheel
modes (see Chapter 14)
 Through the probing cycles 400 to 402 and 410 to 419 in automatic
mode (see User’s Manual, Cycles, Chapters 14 and 15)
 Manual entry (see description below)
You should definitely use datum management if:
 Your machine is equipped with rotary axes (tilting table
or swivel head) and you work with the function for tilting
the working plane
 Your machine is equipped with a spindle-head changing
system
 Up to now you have been working with older TNC
controls with REF-based datum tables
 You wish to machine identical workpieces that are
differently aligned
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.
If you switch the position display to INCH with the MOD
function, the TNC will also show the saved datum
coordinates in inches.
Machine parameter 7268.x can be used to arrange or hide
columns in the preset table as desired (see "List of general
user parameters" page 691 ff).