OSCAT Forum
oscat.lib => Bestehende Module / Existing Modules => Thema gestartet von: hugo am 04. Januar 2007, 11:51:37
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FUNCTION_BLOCK FT_PT2
VAR_INPUT
in : REAL;
T1 : TIME;
T2 : TIME;
K : REAL := 1;
END_VAR
VAR_OUTPUT
out : REAL;
END_VAR
VAR
last : TIME;
tx: TIME;
init: BOOL;
out1 : REAL;
out2 : REAL;
END_VAR
(*
version 1.1 1 jan 2007
programmer hugo
tested by tobias
FT_PT2 is a 2nd grade filter with programmable times T1, T2 and faktor K.
*)
tx := TIME();
IF NOT init THEN
last := tx;
init := TRUE;
ELSE
IF T1> t#0s THEN
out1 := out1 + (in - out1) * TIME_TO_REAL(Tx - last) / TIME_TO_REAL(T1);
ELSE
out1 := in;
END_IF;
IF T2 > t#0s THEN
out2 := out2 + (out1 - out2) * TIME_TO_REAL(Tx - last) / TIME_TO_REAL(T2);
ELSE
out2 := out1;
END_IF;
out := out2 * K;
END_IF;
last := tx;