HEIDENHAIN TNC 320 (340 55x-03) - Manual (Page 367)

HEIDENHAIN TNC 320 367
9.5 Nesting
Program execution
1 Main program SUBPGMS is executed up to block 17
2 Subprogram 1 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 executed from block 40 up to block 45. End of
subprogram 1 and return jump to the main program SUBPGMS.
5 Main program SUBPGMS is executed from block 18 up to block
35. Return jump to block 1 and end of program.