Integral

Product : ISaGRAF V3

Date : 29-March-1999

File : Integral.htm

Subject : Integral algorithm

Keywords: Integral - standard function block - C function block

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Integral standard function block algorithm:

Arguments:

RUN BOO mode: TRUE=integrate / FALSE=hold

R1 BOO overriding reset

XIN REAL input: any real analog value

X0 REAL initial value

CYCLE TMR sampling period

Q BOO Not R1

XOUT REAL integrated output

Description:

Integration of a real value.

Algorithm

/* delay is the current cycle time -

If the "CYCLE" parameter value is less than the cycle timing of the ISaGRAF application,

the sampling period is the cycle timing of the application. */

IF (delay > CYCLE) THEN

date = LAST_DATE;

Q = NOT R1;

IF (R1) THEN XOUT = X0;

ELSE THEN

IF (RUN) THEN

XOUT = XOUT + XIN * (TIME_TO_REAL)delay;

END_IF;

Caution: As you can see RUN input change is only taken into account when CYCLE has ellapsed.

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