6-9
TNC 426/TNC 425/TNC 415 B/TNC 407
6
Subprograms and Program Section Repeats
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3
4
2
5
1
6.4 Nesting
Subprograms and program section repeats can be nested in the following
ways:
• 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 subpro-
grams.
Maximum nesting depth for subprograms: 8
Maximum nesting depth for calling main programs: 4
Subprogram within a subprogram
Program layout
% UPGMS G71 *
e.g. N17
L1,0 * ....................................................... Call subprogram at G98 L1
e.g. N35
G00 G40 Z+100 M2 * .............................. Last block of main program (with M2)
N36
G98 L1 *
e.g. N39
L2,0 *
e.g. N45
G98 L0 * ................................................... End of subprogram 1
N46
G98 L2 *
e.g. N62
G98 L0 * ................................................... End of subprogram 2
N99999
% UPGMS G71 * ..................................... End of main program
Program execution
1st step:
The main program UPGMS is executed up to block 17.
2nd step:
Subprogram 1 is called, and executed up to block 39.
3rd step:
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.
4th step:
Subprogram 1 is called, and executed from block 40 to block 45.
End of subprogram 1 and return jump to the main program UPGMS.
5th step:
Main program UPGMS is executed from block 18 to block 35.
Return jump to block 1 and end of program.
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Subprogram 1
with call of
subprogram 2
Subprogram 2
