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AnnexF/ramp_st.txt
author lbessard
Thu, 26 Jul 2007 17:18:36 +0200
changeset 47 017efb738d95
parent 0 fb772792efd1
permissions -rwxr-xr-x
Help message updated
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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