HEIDENHAIN TNC 320 (340 55x-03) - Manual (Page 366)

366 9 Programming: Subprograms and Program Section Repeats
9.5 Nesting
9.5 Nesting
Types of nesting
„ Subprograms within a subprogram
„ Program section repeats within a program section repeat
„ Subprograms repeated
„ Program section repeats within a subprogram
Nesting depth
The nesting depth is the number of successive levels in which
program sections or subprograms can call further program sections or
subprograms.
„ Maximum nesting depth for subprograms: approx. 64 000
„ Maximum nesting depth for main program calls: The nesting depth
is limited only by the available working memory.
„ You can nest program section repeats as often as desired.
Subprogram within a subprogram
Example NC blocks
0 BEGIN PGM SUBPGMS MM
...
17 CALL LBL “SP1” Call the subprogram marked with LBL SP1
...
35 L Z+100 R0 FMAX M2 Last program block of the
main program (with M2)
36 LBL “SP1” Beginning of subprogram SP1
...
39 CALL LBL 2 Call the subprogram marked with LBL 2
...
45 LBL 0 End of subprogram 1
46 LBL 2 Beginning of subprogram 2
...
62 LBL 0 End of subprogram 2
63 END PGM SUBPGMS MM