HEIDENHAIN TNC 360 User Manual - Manual (Page 125)

TNC 360 6-2
6 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 you wish.
Labels
Subprograms and program section repeats are marked by labels.
A label carries a number from 0 to 254. Each label number (except 0) can
only appear once in a program. Labels are assigned with the command
LABEL SET.
LABEL 0 marks the end of a subprogram.
6.1 Subprograms
Principle
The program is executed up to the block in which
the subprogram is called with CALL LBL (
1 ).
Then the subprogram is executed from beginning to
end (LBL 0) (
2
).
Finally, the main program is resumed from the
block after the subprogram call (
3 ).
Operating limits
• One main program can contain to 254 subpro-
grams.
• Subprograms can be called in any sequence and
as often as desired.
• A subprogram cannot call itself.
• Subprograms should be located at the end of the
main program (after the block with M2 or M30).
• If subprograms are located in the program before
the block with M02 or M30, they will be execut-
ed at least once even without being called.
0 BEGIN PGM ...
CALL LBL 1
L Z+100 M2
LBL 1
LBL 0
END PGM ...
Fig. 6.1: Flow diagram for a subprogram.
S = jump, R = return jump
1
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3
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R
S