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AnnexF/derivative_st.txt
author Edouard Tisserant <edouard.tisserant@gmail.com>
Fri, 05 Apr 2024 13:23:53 +0200
changeset 1103 f3c6c938d5ff
parent 0 fb772792efd1
permissions -rwxr-xr-x
merge
0
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 FUNCTION_BLOCK DERIVATIVE
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   VAR_INPUT
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     RUN : BOOL ;          (* 0 = reset                  *)
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     XIN : REAL ;          (* Input to be differentiated *)
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     CYCLE : TIME ;        (* Sampling period            *)
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   END_VAR
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   VAR_OUTPUT
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     XOUT : REAL ;         (* Differentiated output      *)
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   END_VAR
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   VAR X1, X2, X3 : REAL ; END_VAR
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   IF RUN THEN
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      XOUT := (3.0 * (XIN - X3) + X1 - X2)
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              / (10.0 * TIME_TO_REAL(CYCLE)) ;
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      X3 := X2 ; X2 := X1 ; X1 := XIN ;
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   ELSE XOUT := 0.0; X1 := XIN ; X2 := XIN ; X3 := XIN ;
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   END_IF ;
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 END_FUNCTION_BLOCK
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