HEIDENHAIN TNC 426, User Manual

Page: 372 / 502

346 9 Programming: Subprograms and Program Section Repeats
9.5 Nesting
9.5 Nesting
Types of nesting
n
Subprograms within a subprogram
n
Program section repeats within a program section repeat
n
Subprograms repeated
n
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.
n
Maximum nesting depth for subprograms: 8
n
Maximum nesting depth for calling main programs: 4
n
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 1 Calling a subprogram at LBL 1
...
35 L Z+100 R0 FMAX M2 Last program block of the
main program (with M2)
36 LBL 1 Beginning of subprogram 1
...
39 CALL LBL 2 Call the subprogram marked with LBL2
...
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