author | Mario de Sousa <msousa@fe.up.pt> |
Thu, 31 Mar 2011 10:52:03 +0100 | |
changeset 259 | b6d7c71ff6d8 |
parent 257 | 90782e241346 |
child 276 | 1679f514f38a |
permissions | -rwxr-xr-x |
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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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(* |
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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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* Counter function blocks |
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* ----------------------- |
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*) |
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FUNCTION_BLOCK CTU |
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VAR_INPUT |
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CU : BOOL; |
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R : BOOL; |
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PV : INT; |
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END_VAR |
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VAR_OUTPUT |
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Q : BOOL; |
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CV : INT; |
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END_VAR |
257 | 31 |
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VAR RRR : REAL; END_VAR |
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RRR := 9.9; |
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||
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IF R THEN CV := 0 ; |
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ELSIF CU AND (CV < PV) |
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THEN CV := CV+1; |
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END_IF ; |
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Q := (CV >= PV) ; |
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END_FUNCTION_BLOCK |
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FUNCTION_BLOCK CTD |
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VAR_INPUT |
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CD : BOOL; |
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LD : BOOL; |
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PV : INT; |
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END_VAR |
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VAR_OUTPUT |
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Q : BOOL; |
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CV : INT; |
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END_VAR |
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IF LD THEN CV := PV ; |
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ELSIF CD AND (CV > 0) |
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THEN CV := CV-1; |
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END_IF ; |
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Q := (CV <= 0) ; |
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END_FUNCTION_BLOCK |
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FUNCTION_BLOCK CTUD |
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VAR_INPUT |
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CU : BOOL; |
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CD : BOOL; |
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R : BOOL; |
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LD : BOOL; |
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PV : INT; |
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END_VAR |
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VAR_OUTPUT |
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QU : BOOL; |
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QD : BOOL; |
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CV : INT; |
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END_VAR |
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IF R THEN CV := 0 ; |
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ELSIF LD THEN CV := PV ; |
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ELSE |
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IF NOT (CU AND CD) THEN |
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IF CU AND (CV < PV) |
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THEN CV := CV+1; |
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ELSIF CD AND (CV > 0) |
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THEN CV := CV-1; |
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END_IF; |
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END_IF; |
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END_IF ; |
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QU := (CV >= PV) ; |
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QD := (CV <= 0) ; |
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END_FUNCTION_BLOCK |
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