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

6 Subprograms and Program Section Repeats
6.3 Main Program as Subprogram
Principle
6-8
A program is executed until another program is
called (block with CALL PGM) ( 1 ).
The called program is executed from beginning to
end ( 2 ).
Execution of the program from which the other
program was called is then resumed with the block
following the CALL PGM block ( 3 ).
Operating limits
• Programs called from an external data storage
medium (such as a floppy disk) must not contain
any subprograms or program section repeats.
• No labels are needed to call main programs as
subprograms.
• The called program must not contain the miscellaneous
functions M2 or M30.
• The called program must not contain a jump into
the calling program.
Calling a main program as a subprogram
PGM
CALL
PROGRAM NUMBER?
0
.
BEGIN PGM A...
.
.
1
.
.
CALL PGM B
.
.
3
.
END PGM A...
Enter the main program call and the number of the program you want to call.
Resulting NC block: CALL PGM NAME
A main program can also be called with Cycle 12 PGM CALL (see page 8-38).
S
0 BEGIN PGM B...
.
.
.
. 2
.
.
.
.
END PGM B...
Fig. 6.3: Flow diagram of a main program as subprogram;
S = jump, R = return jump
R
TNC 360