HEIDENHAIN SW 548328-05 DIN Programming - Manual (Page 404)

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DIN programming
4.33 Subr
outines
4.33 Subroutines
Subprogram call: L"xx" V1
The subprogram contains the following elements:
 L: Identifying letter for subprogram call
 "xx": Name of the subprogram—file name for external subprograms
(max. 16 letters or numbers)
 V1: Identification code for external subprograms—omitted for local
subprograms
Note on using subprograms:
 External subprograms are defined in a separate file. They can be
called from any main program or other subprogram.
 Local subprograms are in the main program file. They can be called
only from the main program.
 Subprograms can be nested up to 6 times. Nesting means that
another subprogram is called from within a subprogram.
 Recursion should be avoided.
 You can add up to 29 transfer values to a subprogram.
 Designations: LA to LF, LH, I, J, K, O, P, R, S, U, W, X, Y, Z, BS,
BE, WS, AC, WC, RC, IC, KC and JC
 The identification code within the subprogram is: #__.., followed
by the parameter designation in lowercase letters (for example:
#__la).
 Use the transfer values when programming with variables within
the subprogram.
 String variables: ID and AT
 The variables #l1 – #l30 are available in every subprogram as local
variables.
 To transfer a variable to the main program, program the variable
after the fixed word RETURN. In the main program, the information
is available in #i99.
 If a subprogram is to be executed repeatedly, define in the "number
of repeats" Q parameter the number of times the subprogram is to
be repeated.
 A subprogram ends with RETURN.
The parameter LN is reserved for the transfer of block
numbers. This parameter may receive a new value when
the NC program is renumbered.