HEIDENHAIN TNC 407 (280 580) User Manual - Manual (Page 182)

TNC 425/TNC 415 B/TNC 407 6-8
6 Subprograms and Program Section Repeats
PGM
CALL
Fig. 6.3: Flow diagram of a main program as subprogram;
S = jump, R = return jump
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0 BEGIN PGM B...
END PGM B...
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1
3
2
R
0 BEGIN PGM A...
CALL PGM B
END PGM A...
S
6.3 Main Program as Subprogram
Principle
A program is executed ( 1 ) up to the block in
which another program is called.
Then the other program is run from beginning to
end (
2 ).
The first program is then resumed beginning with
the block behind the program call (
3 ).
Operating limits
• Programs called from an external data medium
(e.g., floppy disk) must not contain any subpro-
grams or program section repeats.
• No labels are needed to call main programs as
subprograms.
• The called program must not contain the miscel-
laneous functions M2 or M30.
• The called program must not contain a jump into
the calling program.
Calling a main program as a subprogram
PROGRAM NAME ?
Enter the name of the program that you wish to call from this block.
Function Soft key
call a plain language program
call an ISO program
call an externally stored program
Resulting NC block: CALL PGM NAME
• You can also call a main program with cycle 12: PGM CALL (see page 8-53).
• If an ISO program is called, G50, G70 or G71 may not be part of the program name.