5 nesting9.5 nesting – HEIDENHAIN TNC 426B (280 472) ISO programming User Manual
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9 Programming: Subprograms and Program Section Repeats
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9.5 Nesting9.5 Nesting
Program execution
1st step:
Main program UPGMS is executed up to block N170.
2nd step: Subprogram 1 is called, and executed up to block
N390.
3rd step:
Subprogram 2 is called, and executed up to block
N620. End of subprogram 2 and return jump to the
subprogram from which it was called.
4th step:
Subprogram 1 is called, and executed from block
N400 up to block N450. End of subprogram 1 and
return jump to the main program UPGMS.
5th step:
Main program UPGMS is executed from block N180
up to block N350. Return jump to block 1 and end of
program.
Repeating program section repeats
Example NC blocks
%REPS G71 *
...
N150 G98 L1 *
...
N200 G98 L2 *
...
N270 L2.2 *
...
N350 L1.1 *
...
N999999 %REPS G71 *
Program execution
1st step:
Main program REPS is executed up to block N270.
2nd step: Program section between block N270 and block N200
is repeated twice.
3rd step:
Main program REPS is executed from block N280 to
block N350.
4th step:
Program section between block N350 and block N150
is repeated once (including the program section
repeat between N200 and block N270).
5th step:
Main program REPS is executed from block N360 to
block N999 999 (end of program).
Beginning of program section repeat 1
Beginning of program section repeat 2
The program section between this block and G98 L2
(block N200) is repeated twice.
The program section between this block and G98 L1
(block N150) is repeated once.
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