HEIDENHAIN iTNC 530 (60642x-04) ISO programming - Manual (Page 272)

272 Programming: Subprograms and Program Section Repeats
8.5
Nesting
8.5 Nesting
Types of nesting
 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 main program calls: 30, where a G79
acts like a main program call
 You can nest program section repeats as often as desired