HEIDENHAIN iTNC 530 (340 49x-02) Pilot - Manual (Page 102)

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Unit 7 Datum shift (FCL 2 function)
With unit 7, datum shift, you define a datum number from the datum
table that you have specified in the program header.
Before you use unit 7 you must select in the program head
the datum table in which smarT.NC will apply the datum
numbers (see “Program settings” on page 29.).
Reset datum shift: Define unit 7 with number 0. Ensure that
in line 0 all coordinates are defined as 0.
If you want to define a datum shift by entering coordinates,
use the conversational unit (see “Unit 40 Conversational
Unit” on page 110.).