lib/timer.txt
author Mario de Sousa <msousa@fe.up.pt>
Wed, 18 Apr 2012 13:29:08 +0100
changeset 522 f9cff11ae622
parent 392 9b88b8b6bccd
child 885 b2604fc6d25c
permissions -rwxr-xr-x
Start having nicer stage 4 error messages.
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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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 * Timer Function Blocks
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 * ---------------------
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 *
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 * NOTE: The timing diagrams in the comments (except the state variable) 
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 *       were taken from the IEC 61131-3 standard.
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 *)
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(****************************************************************
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                  TP - pulse timing - state machine
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            +--------+     ++ ++   +--------+
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       IN   |        |     || ||   |        |
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          --+        +-----++-++---+        +---------
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            t0       t1    t2 t3    t4       t5
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            +----+         +----+  +----+
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       Q    |    |         |    |  |    |
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          --+    +---------+    +--+    +-------------
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            t0   t0+PT    t2 t2+PT t4  t4+PT
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         PT      +---+          +       +---+
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          :     /    |         /|      /    |
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       ET :    /     |        / |     /     |
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          :   /      |       /  |    /      |
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          :  /       |      /   |   /       |
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          0-+        +-----+    +--+        +---------
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            t0       t1    t2      t4       t5
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        2        +---+          +       +---+
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STATE   1   +----+   |     +----|  +----+   | 
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        0 --+        +-----+    +--+        +---------
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****************************************************************)
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FUNCTION_BLOCK TP
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  VAR_INPUT
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    IN : BOOL;  (* first input parameter *)
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    PT : TIME;  (* second input parameter *)
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  END_VAR
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  VAR_OUTPUT
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    Q : BOOL := FALSE;  (* first output parameter *)
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    ET : TIME := T#0s;  (* second output parameter *)
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  END_VAR
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  VAR
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    STATE : SINT := 0;  (* internal state: 0-reset, 1-counting, 2-set *)
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    PREV_IN : BOOL := FALSE;
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    CURRENT_TIME, START_TIME : TIME;
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  END_VAR
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  {__SET_VAR(data__->,CURRENT_TIME,__CURRENT_TIME)}
0
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  IF ((STATE = 0) AND NOT(PREV_IN) AND IN)   (* found rising edge on IN *)
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  THEN
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    (* start timer... *)
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    STATE := 1;
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    Q := TRUE;
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    START_TIME := CURRENT_TIME;
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  ELSIF (STATE = 1)
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  THEN
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    IF ((START_TIME + PT) <= CURRENT_TIME)
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    THEN
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      STATE := 2;
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      Q := FALSE;
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      ET := PT;
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    ELSE
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      ET := CURRENT_TIME - START_TIME;
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    END_IF;
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  END_IF;
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  IF ((STATE = 2) AND NOT(IN))
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  THEN
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    ET := T#0s;
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    STATE := 0;
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  END_IF;
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  PREV_IN := IN;
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END_FUNCTION_BLOCK
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(****************************************************************
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             TON - On-delay timing - state machine
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            +--------+        +---+   +--------+
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       IN   |        |        |   |   |        |
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          --+        +--------+   +---+        +-------------
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            t0       t1       t2  t3  t4       t5
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                 +---+                     +---+
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       Q         |   |                     |   |
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          -------+   +---------------------+   +-------------
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              t0+PT  t1                t4+PT   t5
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         PT      +---+                     +---+
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          :     /    |            +       /    |
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       ET :    /     |           /|      /     |
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          :   /      |          / |     /      |
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          :  /       |         /  |    /       |
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          0-+        +--------+   +---+        +-------------
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            t0       t1       t2  t3  t4       t5
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        2        +---+                     +---+
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STATE   1   +----+   |        +---+   +----+   |
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        0 --+        +--------+   +---+        +------
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****************************************************************)
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FUNCTION_BLOCK TON
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  VAR_INPUT
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    IN : BOOL;  (* first input parameter *)
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    PT : TIME;  (* second input parameter *)
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  END_VAR
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  VAR_OUTPUT
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    Q : BOOL := FALSE;  (* first output parameter *)
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    ET : TIME := T#0s;  (* second output parameter *)
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  END_VAR
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  VAR
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    STATE : SINT := 0;  (* internal state: 0-reset, 1-counting, 2-set *)
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    PREV_IN : BOOL := FALSE;
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    CURRENT_TIME, START_TIME : TIME;
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  END_VAR
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  {__SET_VAR(data__->,CURRENT_TIME,__CURRENT_TIME)}
0
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  IF ((STATE = 0) AND NOT(PREV_IN) AND IN)   (* found rising edge on IN *)
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  THEN
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    (* start timer... *)
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    STATE := 1;
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    Q := FALSE;
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    START_TIME := CURRENT_TIME;
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  ELSE
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    (* STATE is 1 or 2 !! *)
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    IF (NOT(IN))
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    THEN
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      ET := T#0s;
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      Q := FALSE;
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      STATE := 0;
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    ELSIF (STATE = 1)
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    THEN
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      IF ((START_TIME + PT) <= CURRENT_TIME)
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      THEN
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        STATE := 2;
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        Q := TRUE;
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        ET := PT;
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      ELSE
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        ET := CURRENT_TIME - START_TIME;
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      END_IF;
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    END_IF;
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  END_IF;
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  PREV_IN := IN;
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END_FUNCTION_BLOCK
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(****************************************************************
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             TOF - Off-delay timing - state machine
0
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              +--------+        +---+   +--------+
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       IN     |        |        |   |   |        |
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           ---+        +--------+   +---+        +-----------
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              t0       t1       t2  t3  t4       t5
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              +-------------+   +---------------------+
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       Q      |             |   |                     |
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           ---+             +---+                     +------
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              t0          t1+PT t2                  t5+PT
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         PT                 +---+                     +------
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          :                /    |       +            /
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       ET :               /     |      /|           /
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          :              /      |     / |          /
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          :             /       |    /  |         /
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          0------------+        +---+   +--------+
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                       t1           t3           t5
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        2                   +---+                     +------
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STATE   1              +----+   |   +---+        +----+
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        0 -------------+        +---+   +--------+
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****************************************************************)
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FUNCTION_BLOCK TOF
0
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  VAR_INPUT
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    IN : BOOL;  (* first input parameter *)
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    PT : TIME;  (* second input parameter *)
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  END_VAR
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  VAR_OUTPUT
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    Q : BOOL := FALSE;  (* first output parameter *)
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    ET : TIME := T#0s;  (* second output parameter *)
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  END_VAR
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  VAR
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    STATE : SINT := 0;  (* internal state: 0-reset, 1-counting, 2-set *)
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    PREV_IN : BOOL := FALSE;
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    CURRENT_TIME, START_TIME : TIME;
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  END_VAR
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  {__SET_VAR(data__->,CURRENT_TIME,__CURRENT_TIME)}
0
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  IF ((STATE = 0) AND PREV_IN AND NOT(IN))   (* found falling edge on IN *)
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  THEN
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    (* start timer... *)
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    STATE := 1;
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    START_TIME := CURRENT_TIME;
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  ELSE
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    (* STATE is 1 or 2 !! *)
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    IF (IN)
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    THEN
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      ET := T#0s;
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      STATE := 0;
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    ELSIF (STATE = 1)
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    THEN
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      IF ((START_TIME + PT) <= CURRENT_TIME)
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      THEN
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        STATE := 2;
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        ET := PT;
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      ELSE
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        ET := CURRENT_TIME - START_TIME;
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      END_IF;
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    END_IF;
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  END_IF;
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  Q := IN OR (STATE = 1);
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  PREV_IN := IN;
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END_FUNCTION_BLOCK
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