HEIDENHAIN TNC 640 (34059x-02) ISO programming - Manual (Page 242)

Programming: Subprograms and program section repeats
8.5 Nesting
8
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TNC 640 | User's Manual for DIN/ISO Programming | 5/2013
Subprogram within a subprogram
Example NC blocks
%UPGMS G71 *
...
N17 L "UP1",0 *
Subprogram at label G98 L1 is called
...
N35 G00 G40 Z+100 M2 *
Last program block of the
main program (with M2)
N36 G98 L "UP1" Beginning of subprogram SP1
...
N39 L2,0 *
Subprogram at label G98 L2 is called
...
N45 G98 L0 *
End of subprogram 1
N46 G98 L2 * Beginning of subprogram 2
...
N62 G98 L0 *
End of subprogram 2
N99999999 %UPGMS G71 *
Program execution
1 Main program UPGMS is executed up to block 17.
2 Subprogram SP1 is called, and executed up to block 39.
3 Subprogram 2 is called, and executed up to block 62. End of
subprogram 2 and return jump to the subprogram from which it
was called.
4 Subprogram 1 is called, and executed from block 40 up to block
45. End of subprogram 1 and return jump to the main program
UPGMS.
5 Main program UPGMS is executed from block 18 up to block 35.
Return jump to block 1 and end of program.