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AnnexF/diffeq_st.txt
author Mario de Sousa <msousa@fe.up.pt>
Sat, 28 Jul 2012 09:07:55 +0100
changeset 615 509b79602f7c
parent 0 fb772792efd1
permissions -rwxr-xr-x
Check lvalues in expressions passed to Function/FB IN parameters.
0
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 FUNCTION_BLOCK DIFFEQ
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   VAR_INPUT
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     RUN : BOOL ;             (* 1 = run, 0 = reset *)
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     XIN : REAL ;
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     A : ARRAY[1..] OF REAL ; (* Input coefficients *)
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     M : INT ;                (* Length of input history  *)
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     B : ARRAY[0..] OF REAL ; (* Output coefficients *)
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     N : INT ;                (* Length of output history *)
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   END_VAR
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   VAR_OUTPUT XOUT : REAL := 0.0 ; END_VAR
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   VAR  (* NOTE : Manufacturer may specify other array sizes *)
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     XI : ARRAY [0..128] OF REAL ; (* Input history  *)
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     XO : ARRAY [0..128] OF REAL ; (* Output history *)
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     I : INT ;
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   END_VAR
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   XO[0] := XOUT ; XI[0] := XIN ;
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   XOUT := B[0] * XIN ;
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   IF RUN THEN
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      FOR I := M TO 1 BY -1 DO
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          XOUT := XOUT + A[I] * XO[I] ; XO[I] := XO[I-1];
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      END_FOR;
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      FOR I := N TO 1 BY -1 DO
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          XOUT := XOUT + B[I] * XI[I] ; XI[I] := XI[I-1];
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      END_FOR;
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   ELSE
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      FOR I := 1 TO M DO XO[I] := 0.0; END_FOR;
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      FOR I := 1 TO N DO XI[I] := 0.0; END_FOR;
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   END_IF ;
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 END_FUNCTION_BLOCK
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