HEIDENHAIN TNC 640 (34059x-05) ISO programming - Manual (Page 283)

Nesting 8.5
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TNC 640 | User's ManualDIN/ISO Programming | 1/2015
283
8.5 Nesting
Types of nesting
Subprogram calls in subprograms
Program section repeats within a program section repeat
Subprogram calls in program section repeats
Program section repeats in subprograms
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: 19
Maximum nesting depth for main program calls: 19, where a
G79 acts like a main program call
You can nest program section repeats as often as desired