lib/edge_detection.txt
author mjsousa
Sat, 07 May 2016 21:17:49 +0100
changeset 1010 242907849850
parent 0 fb772792efd1
child 1094 068c28266332
permissions -rwxr-xr-x
Correctly identify errors when parsing erroneous code (make sure flex goes back to INITIAL state when code contains errors that do not allow determining whether ST or IL is being parsed)
0
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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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 * Edge detection function blocks
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 * ------------------------------
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 *)
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FUNCTION_BLOCK R_TRIG
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     VAR_INPUT  CLK: BOOL; END_VAR
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     VAR_OUTPUT  Q: BOOL; END_VAR
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     VAR RETAIN M: BOOL; END_VAR
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Q := CLK AND NOT M;
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M := CLK;
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END_FUNCTION_BLOCK
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FUNCTION_BLOCK F_TRIG
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     VAR_INPUT  CLK: BOOL; END_VAR
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     VAR_OUTPUT   Q: BOOL; END_VAR
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     VAR RETAIN M: BOOL; END_VAR
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Q := NOT CLK AND NOT M;
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M := NOT CLK;
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END_FUNCTION_BLOCK
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