lib/edge_detection.txt
author Edouard Tisserant
Fri, 22 Jul 2022 09:24:12 +0200
changeset 1099 cdb045e8be20
parent 1094 068c28266332
permissions -rwxr-xr-x
In VARIABLES.CSV, RETAIN variable were only flagged as such for GLOBALS, now local POU variable shoud be as well.
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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 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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068c28266332 Remove RETAIN qualifier for F_TRIG and R_TRIG 'M' variable. This is not following standard, and implicitely consumes a lot of RETAIN memory. User can explicitely qualify R_TRIG of F_TRIG instance as RETAIN if needed.
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     VAR 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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