User's Manual TNC 360 (from 259 900-11) - heidenhain

6 Subprograms and Program Section Repeats
6-2
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 subprograms.
• 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 executed
at least once even without being called.
0 BEGIN PGM ...
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1
CALL LBL 1
3
L Z+100 M2
LBL 1
2
LBL 0
END PGM ...
Fig. 6.1: Flow diagram for a subprogram.
S = jump, R = return jump
R
S
TNC 360