HEIDENHAIN PT 855 for Milling - Manual (Page 66)

I - 4 Programming POSITIP
64 Operating Instructions POSITIP 855
Subprograms and program section repeats
Subprograms and program section repeats only need to be entered
once in the program. You can then run them up to 999 times.
Subprograms can be run at any point in the program, while pro-
gram section repeats are run several times in succession.
Inserting program marks (labels)
You identify subprograms and program section repeats with labels
(abbreviated in the program to
LBL
).
Labels 1 to 99
Labels 1 to 99 identify the beginning of a subprogram or a program
section which is to be repeated.
Label 0
Label 0 is used only to identify the end of a subprogram.
Label call
In the program, subprograms and program sections are called with
the command
CALL LBL
.
The command
CALL LBL 0
is not allowed.
Subprograms:
After a
CALL LBL
block in the program, POSITIP executes the
called subprogram.
Program section repeats:
POSITIP repeats the program section located before the
CALL
LBL
block. You enter the number of repeats with the
CALL LBL
command.
Nesting program sections
Subprograms and program section repeats can also be "nested."
For example, a subprogram can in turn call another subprogram.
Maximum nesting depth: 8 levels.
Fig. 29: On-screen operating instructions for
program section repeats (page 3
shown)
Fig. 28: On-screen operating instructions for
subprograms (page 5 shown)