Lenze PLC Designer PLC Designer (R2-x) Uživatelský manuál stáhnout pdf (Strana 37)

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L-force | PLC Designer

What is What in PLC Designer

 DMS 3.2 EN 02/2011 TD29 35

Example of a function Fct in IL, in which three input variables are declared:

The first both input variables get multiplicated and then divided by the third one. The

function returns the result of this operation:

Declaration part:

FUNCTION Fct: INT

VAR_INPUT

PAR1:INT;

PAR2:INT;

PAR3:INT;

END_VAR

Implementation part:

LD PAR1

MUL PAR2

DIV PAR3

ST Fct

Calling a function:

In ST a function call can be used as operand in an expression.

In SFC a function call can only take place within actions of a step or a transition.

 Note!

»PLC Designer« allows using global variables within a function. This intentionally

deviates from the IEC61131-3 standard, which prescribes that return value of a

function only will be modified by the input parameters. Thus the difference

between functions and programs is just, that functions return only one return value

and that their parameters and return values are handled over the stack.

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