lib/ramp_st.txt
author Mario de Sousa <msousa@fe.up.pt>
Wed, 13 Feb 2019 14:16:26 +0000
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(* Following taken directly from the IEC 61131.3 draft standard *)
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(*
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 * An IEC 61131-3 IL and ST compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 *)
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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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