6 – 302 HEIDENHAIN Technical Manual TNC 426, TNC 430
6.13.19 Datum Tables (.D)
You can define up to 255 different datums in a datum table:
7
77
7 In MP7226.1, define the size of the table.
With Cycle 7 “datum shift,” you can enter the new datum with absolute
coordinates or specify a line number from the datum table (see User’s
Manual).
With Modules 9092 to 9094 you can use the PLC to read from and write to the
current datum table (See "Tool Table, Pocket Table” on page 6 – 400).
With FN17 and FN18 you can read and overwrite the values in the datum table
(OEM cycles).
MP7226.1 Size of the datum table
Input: 0 to 255 [lines]
Reference for
values in the datum
table
The values from the datum table can be interpreted with respect to the
workpiece datum or to the machine datum (MP960.x):
7
77
7 Enter the datum in MP7475.
MP7475 Reference for datum table
Input: 0: Reference is workpiece datum
1: Reference is machine datum (MP960.x)
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