HEIDENHAIN iTNC 530 (606 42x-01) - Manual (Page 272)

272 Programming: Subprograms and Program Section Repeats
8.2 Subpr
ogr
a
ms
Calling a subprogram
U To call a subprogram, press the LBL CALL key.
U Call subprogram /repeat : 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 If you want to enter the number of a
string parameter as target address: Press the QS soft
key; the TNC will then jump to the label name that is
specified in the string parameter defined.
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).