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lib/integral_st.txt
author Mario de Sousa <msousa@fe.up.pt>
Mon, 04 Apr 2011 15:22:42 +0100
changeset 275 af3d0e3ac65d
parent 192 c6c2a3d487ac
child 276 1679f514f38a
permissions -rwxr-xr-x
Leave standard function names hardcoded, as these are considered keywords even though
they may not be implemented in the library.
192
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 FUNCTION_BLOCK INTEGRAL
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   VAR_INPUT
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     RUN : BOOL ;       (* 1 = integrate, 0 = hold *)
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     R1 : BOOL ;        (* Overriding reset        *)
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     XIN : REAL ;       (* Input variable          *)
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     X0  : REAL ;       (* Initial value           *)
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     CYCLE : TIME ;     (* Sampling period         *)
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   END_VAR
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   VAR_OUTPUT
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     Q : BOOL ;         (* NOT R1                  *)
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     XOUT : REAL ;      (* Integrated output       *)
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   END_VAR
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   Q := NOT R1 ;
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   IF R1 THEN XOUT := X0 ;
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   ELSIF RUN THEN XOUT := XOUT + XIN * TIME_TO_REAL(CYCLE);
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   END_IF ;
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 END_FUNCTION_BLOCK
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