HEIDENHAIN TNC 620 (73498x-01) ISO programming - Manual (Page 194)

194 Programming: Subprograms and program section repeats
7.
1 Labeling subpr
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a
ms and pr
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m section r
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peats
7.1 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 labels (G98 L).
A LABEL is identified by a number between 1 and 999 or by a name
you define. Each LABEL number or LABEL name can be set only once
in the program with the LABEL SET key or by entering G98. The
number of label names you can enter is only limited by the internal
memory.
Label 0 (G98 L0) is used exclusively to mark the end of a subprogram
and can therefore be used as often as desired.
Do not use a label number or label name more than once!