HEIDENHAIN TNC 426 (280 476) Pilot - Manual (Page 33)

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Subprograms
S = Jump; R = Return jump
Subprogram Nesting:
A Subprogram within a Subprogram
1
The main program runs up to the first subprogram call CALL LBL1.
2 Subprogram 1 runs up to the second subprogram call CALL LBL2.
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!