HEIDENHAIN TNC 410 ISO Programming - Manual (Page 342)

316 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
The beginnings of subprograms and program section repeats are
marked in a part program by G98 labels.
A label is identified by a number between 1 and 254. Each label 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.
For the TNC 426, TNC 430:
With very long programs, you can limit the number of
blocks to be checked for repeated labels with MP7229.