HEIDENHAIN iTNC 530 (340 49x-03) Pilot - Manual (Page 42)

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Subprogram Nesting
Subprogram within a subprogram
1 The main program runs up to the first subprogram call CALL LBL 1.
2 Subprogram 1 runs up to the second subprogram call CALL LBL 2.
3 Subprogram 2 runs to its end.
4 Subprogram 1 resumes and runs to its end.
5 The main program resumes.
„ A subprogram cannot call itself.
„
Subprograms can be nested up to a maximum depth of 8
levels.