
4Ć84 FST Configuration
Original Ć June 1990CE4.2:CL6211
FIL FIL
35
INSTRUCTION NAME: FIL (first order digital filter)
DESCRIPTION : This instruction performs first-order filtering on the SVA input. The time constant
of the filter defines the time required for 63.21 percent of a step change at the input of the filter to
appear at the output. The time constant is contained in operand 1. The SVD input remains
unchanged.
GRAPHIC REPRESENTATION: SYMBOLIC REPRESENTATION:
100
0
t
0
t
1
INPUT OUTPUT
tt
t
432
t
0
t
1
tt
t
432
f(t)
OPERAND 1
50
100%
0
63%
t
2
-
t
1
EQUALS
SVA (IN)
CONFIGURATION FORMAT: FIL (
First order time constant >>
Comment >>
OPERAND DESCRIPTIONS:
First order time constant - A tuning parameter that specifies the filter time constant in minutes.
The time constant is any non-negative floating point number.
Comment - A comment up to 255 characters long.
FUNCTION EQUATIONS:
SVA(out)@t2 = [(TP/Dt)SVA(out)@t1 + SVA(in)]/(1 + TP/Dt) :
approximately = SVA(in)/(TPs +1)
Where: SVA(out)@t2 = Latest output value
SVA(out)@t1 = Previous output value
TP = Filter time constant in minutes (operand 1)
Dt = t2 - t1 = sample time in minutes
SVD(out) = SVD(in)
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