User's Manual TNC 360 (from 259 900-11) - heidenhain

6 Subprograms and Program Section Repeats
6.4 Nesting
Nesting depth
TNC 360
Subprograms and program section repeats can be nested in the following
variations:
• Subprograms in subprograms
• Program section repeats in program section repeats
• Subprograms can be repeated
• Program section repeats can appear in subprograms
The nesting depth is the number of successive levels for which subprograms
or program sections can call further subprograms or program
sections.
Maximum nesting depth for subprograms: 8
Maximum nesting depth for calling main programs: 4
Subprogram in a subprogram
Program layout
0
.
BEGIN PGM 360069 MM
.
.
1
e.g. 17
.
CALL LBL 1 .............................................. Call of subprogram at LBL1
.
.
5
e.g. 35 L Z+100 R0 FMAX M2 ............................. Last program block of main program (with M2)
36
.
LBL 1
.
.
2
e.g. 39
.
CALL LBL 2
.
.
4
e.g. 45 LBL 0 ........................................................ End of subprogram 1
46
.
LBL 2
.
.
3
e.g. 62 LBL 0 ........................................................ End of subprogram 2
63 END PGM 360069 MM ............................ End of main program
Sequence of program execution
Step 1: Main program 360069 is executed up to block 17.
Step 2: Subprogram 1 is called and executed up to block 39.
Step 3: Subprogram 2 is called and executed up to block 62.
End of subprogram 2 and return to subprogram from
which it was called.
Step 4: Subprogram 1 is executed from block 40 to block 45.
End of subprogram 1 and return to main program 360069.
Step 5: Main program 360069 is executed from block 18 to block 35.
Return jump to block 1 and program end.
A subprogramm ending with LBL 0 must not be nested in another subprogram!
Subprogram 1
with program call of
subprogram 2
Subprogram 2
6-9