HEIDENHAIN TNC 620 (73498x-01) - Manual (Page 221)

HEIDENHAIN TNC 620 221
7.
2 Subpr
ogr
a
ms
7.2 Subprograms
Operating sequence
1 The TNC executes the part program up to the block in which a
subprogram is called with CALL LBL
2 The subprogram is then executed from beginning to end. The
subprogram end is marked LBL 0
3 The TNC then resumes the part program from the block after the
subprogram call CALL LBL
Programming notes
„ A main program can contain up to 254 subprograms
„ You can call subprograms in any sequence and as often as desired
„ A subprogram cannot call itself
„ Write subprograms at the end of the main program (behind the block
with M2 or M30)
„ If subprograms are located before the block with M2 or M30, they
will be executed at least once even if they are not called
Programming a subprogram
U To mark the beginning, press the LBL SET key
U Enter the subprogram number. If you want to use a
label name, press the LBL NAME soft key to switch
to text entry
U To mark the end, press the LBL SET key and enter the
label number "0"
Calling a subprogram
U To call a subprogram, press the LBL CALL key
U Label number : Enter the label number of the
subprogram you wish to call. If you want to use a label
name, press the LBL NAME soft key to switch to text
entry
U Repeat REP : Ignore the dialog question with the
NO ENT key. Repeat REP is used only for program
section repeats.
CALL LBL 0 is not permitted (Label 0 is only used to mark
the end of a subprogram).