HEIDENHAIN TNC 406 - Manual (Page 195)

174 9 Programming: Subprograms and Program Section Repeats
9.1 Labeling Subpr
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ams and Pr
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am Section Repeats
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 labels.
A label is identified by a number between 1 and 254. Each label can be
set only once with LABEL SET in a program.
LABEL 0 (LBL 0) is used exclusively to mark the end of a subprogram
and can therefore be used as often as desired.
For a better overview in this program window, LBL blocks and CALL
LBL blocks are indented to the left by one character.
If a label is set more than once, the TNC sends an error
message at the end of the LBL SET block.