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AnnexF/ramp_st.txt
author mjsousa
Sat, 07 May 2016 21:17:49 +0100
changeset 1010 242907849850
parent 0 fb772792efd1
permissions -rwxr-xr-x
Correctly identify errors when parsing erroneous code (make sure flex goes back to INITIAL state when code contains errors that do not allow determining whether ST or IL is being parsed)
0
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 FUNCTION_BLOCK RAMP
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   VAR_INPUT
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     RUN : BOOL ;      (* 0 - track X0, 1 - ramp to/track X1 *)
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     X0,X1 : REAL ;
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     TR : TIME ;       (* Ramp duration *)
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     CYCLE : TIME ;    (* Sampling period *)
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   END_VAR
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   VAR_OUTPUT
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     BUSY : BOOL ; (* BUSY = 1 during ramping period *)
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     XOUT : REAL := 0.0 ;
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   END_VAR
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   VAR XI : REAL ;       (* Initial value *)
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       T : TIME := T#0s; (* Elapsed time of ramp *)
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   END_VAR
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   BUSY := RUN ;
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   IF RUN THEN
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      IF T >= TR THEN BUSY := 0 ; XOUT := X1 ;
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      ELSE XOUT := XI + (X1-XI) * TIME_TO_REAL(T)
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                                / TIME_TO_REAL(TR) ;
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           T := T + CYCLE ;
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      END_IF ;
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   ELSE XOUT := X0 ; XI := X0 ; T := t#0s ;
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   END_IF ;
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 END_FUNCTION_BLOCK
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