85 lines
2.1 KiB
Plaintext
Executable File
85 lines
2.1 KiB
Plaintext
Executable File
(*
|
|
* This file is part of matiec - a compiler for the programming
|
|
* languages defined in IEC 61131-3
|
|
*
|
|
* Copyright (C) 2011 Mario de Sousa (msousa@fe.up.pt)
|
|
*
|
|
* See COPYING and COPYING.LESSER files for copyright details.
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 3 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
|
* USA
|
|
*
|
|
* This code is made available on the understanding that it will not be
|
|
* used in safety-critical situations without a full and competent review.
|
|
*)
|
|
|
|
|
|
|
|
(*
|
|
* An IEC 61131-3 compiler.
|
|
*
|
|
* Based on the
|
|
* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
|
|
*
|
|
*)
|
|
|
|
|
|
(*
|
|
* This is part of the library conatining the functions
|
|
* and function blocks defined in the standard.
|
|
*
|
|
* SR and RS function blocks
|
|
* -------------------------
|
|
*)
|
|
|
|
(* The standard defines the SR FB thus:
|
|
|
|
+-----+
|
|
S1----------------| >=1 |---Q1
|
|
+---+ | |
|
|
R------O| & |----| |
|
|
Q1------| | | |
|
|
+---+ +-----+
|
|
*)
|
|
|
|
FUNCTION_BLOCK SR
|
|
VAR_INPUT
|
|
S1, R : BOOL;
|
|
END_VAR
|
|
VAR_OUTPUT
|
|
Q1 : BOOL;
|
|
END_VAR
|
|
Q1 := S1 OR ((NOT R) AND Q1);
|
|
END_FUNCTION_BLOCK
|
|
|
|
|
|
(* The standard defines the RS FB thus:
|
|
+---+
|
|
R1----------------O| & |---Q1
|
|
+-----+ | |
|
|
S-------| >=1 |----| |
|
|
Q1------| | | |
|
|
+-----+ +---+
|
|
*)
|
|
|
|
FUNCTION_BLOCK RS
|
|
VAR_INPUT
|
|
S, R1 : BOOL;
|
|
END_VAR
|
|
VAR_OUTPUT
|
|
Q1 : BOOL;
|
|
END_VAR
|
|
Q1 := (NOT R1) AND (S OR Q1);
|
|
END_FUNCTION_BLOCK
|