| author | mario |
| Thu, 01 Nov 2007 20:58:56 +0100 | |
| changeset 77 | fe4ecf7efa79 |
| parent 0 | fb772792efd1 |
| child 113 | ea3f099f5b5f |
| permissions | -rwxr-xr-x |
|
0
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1 |
(* |
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* (c) 2005 Mario de Sousa |
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* |
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* Offered to the public under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 of the |
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* License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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* Public License for more details. |
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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 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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(* |
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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 were taken from the |
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* 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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{data__->CURRENT_TIME = __CURRENT_TIME;}
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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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|
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{data__->CURRENT_TIME = __CURRENT_TIME;}
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|
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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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|
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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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|
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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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|
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END_IF; |
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|
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PREV_IN := IN; |
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|
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END_FUNCTION_BLOCK |
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198 |
|
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|
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200 |
|
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|
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|
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(**************************************************************** |
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|
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TOFF - Off-delay timing - state machine |
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|
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|
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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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223 |
|
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|
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2 +---+ +------ |
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STATE 1 +----+ | +---+ +----+ |
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0 -------------+ +---+ +--------+ |
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|
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229 |
|
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****************************************************************) |
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FUNCTION_BLOCK TOFF |
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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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|
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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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|
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{data__->CURRENT_TIME = __CURRENT_TIME;}
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249 |
|
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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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|
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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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|
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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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|
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END_IF; |
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|
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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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280 |