HEIDENHAIN iTNC 530 (340 422) ISO programming - Manual (Page 402)

402 9 Programming: Subprograms and Program Section Repeats
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9.1 Labeling Subprograms and
Program Section Repeats
Subprograms and program section repeats enable you to program a
machining sequence once and then run it as often as desired.
Labels
Subprograms and program section repeats begin with the function
G98 L
in the part program. The letter L stands for "label."
A label is identified by a number between 1 and 254. Each label
number can be set only once with G98 in a program.
Label 0 (G98 L0) is used exclusively to mark the end of a subprogram
and can therefore be used as often as desired.
If a label is set more than once, the TNC sends an error
message at the end of the G98 block.
With very long programs, you can limit the number of
blocks to be checked for repeated labels with MP7229.