Siemens SINUMERIK 840D sl Programming Manual page 91

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Second method of parameter transfer:

• Values are only transferred (call-by-value)

If the parameters transferred are changed as the subroutine runs this does not have any

effect on the main program. The parameters remain unchanged in it (see Fig.).

• Parameter transfer with data exchange (call-by-reference)

Any change to the parameters in the subroutine also causes the parameter to change in the

main program (see Fig.).

Example: variable array lengths

%_N_DRILLING_PLATE_MPF

DEF REAL TABLE[100,2]

EXTERN DRILLING_PATTERN (VAR REAL[,2],INT)

TABLE[0,0]=-17.5

TABLE[99.1]=45

DRILLING_PATTERN(TABLE,100)

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Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0

2.3 Subroutines with parameter transfer (PROC, VAR)

Main program

;Define position table

;Define positions

;Subroutine call

Subroutines, Macros