lib/bistable.txt
author Laurent Bessard
Thu, 13 Sep 2012 16:35:10 +0200
changeset 633 73b56dc69e61
parent 277 f88718b71b6c
permissions -rwxr-xr-x
Fix bug with task interval using fixed_point value for duration items
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(*
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 *  This file is part of matiec - a compiler for the programming
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 *  languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2011  Mario de Sousa (msousa@fe.up.pt)
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 *
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 * See COPYING and COPYING.LESSER files for copyright details.
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 3 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 * 
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
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 * USA
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 *)
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(*
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 * An IEC 61131-3 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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(*
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 * This is part of the library conatining the functions
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 * and function blocks defined in the standard.
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 *
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 * SR and RS function blocks
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 * -------------------------
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 *)
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(* The standard defines the SR FB thus: 
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                  +-----+
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S1----------------| >=1 |---Q1
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         +---+    |     |
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 R------O| & |----|     |
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 Q1------|   |    |     |
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         +---+    +-----+
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*)
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FUNCTION_BLOCK SR
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  VAR_INPUT
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    S1, R : BOOL;
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  END_VAR
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  VAR_OUTPUT
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    Q1 : BOOL;
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  END_VAR
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  Q1 := S1 OR ((NOT R) AND Q1);
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END_FUNCTION_BLOCK
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(* The standard defines the RS FB thus: 
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                   +---+
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R1----------------O| & |---Q1
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        +-----+    |   |
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S-------| >=1 |----|   |
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Q1------|     |    |   |
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        +-----+    +---+
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*)
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FUNCTION_BLOCK RS
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  VAR_INPUT
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    S, R1 : BOOL;
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  END_VAR
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  VAR_OUTPUT
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    Q1 : BOOL;
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  END_VAR
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  Q1 := (NOT R1) AND (S OR Q1);
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END_FUNCTION_BLOCK