lib/edge_detection.txt
author mjsousa
Sat, 27 Dec 2014 09:41:01 +0000
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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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