Nesting; Subprogram Within A Subprogram - HEIDENHAIN TNC 426 B User Manual

9.5 Nesting

You can nest subprograms and program section repeats in the
following ways:
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: 8
Maximum nesting depth for calling main programs: 4
You can nest program section repeats as often as desired

Subprogram within a subprogram

Example NC blocks
BEGIN PGM SUBPGM MM
...
17 CALL LBL 1
...
35 L Z+1 R FMAX M2
36 LBL 1
...
39 39 CALL LBL 2
...
45 LBL
46 LBL 2
...
62 LBL
63 END PGM SUBPGM MM
HEIDENHAIN TNC 426 B, TNC 430
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Call the subprogram marked with LBL1
Last program block of the
main program (with M2)
Beginning of subprogram 1
Call the subprogram marked with LBL2
End of subprogram 1
Beginning of subprogram 2
End of subprogram 2
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