(* Following taken directly from the IEC 61131.3 draft standard *)

(*
 * An IEC 61131-3 IL and ST compiler.
 *
 * Based on the
 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
 *
 *)


(*
 * This is part of the library conatining the functions
 * and function blocks defined in the standard.
 *
 * Edge detection function blocks
 * ------------------------------
 *)

FUNCTION_BLOCK R_TRIG
     VAR_INPUT  CLK: BOOL; END_VAR
     VAR_OUTPUT  Q: BOOL; END_VAR
     VAR RETAIN M: BOOL; END_VAR
Q := CLK AND NOT M;
M := CLK;
END_FUNCTION_BLOCK

FUNCTION_BLOCK F_TRIG
     VAR_INPUT  CLK: BOOL; END_VAR
     VAR_OUTPUT   Q: BOOL; END_VAR
     VAR RETAIN M: BOOL; END_VAR
Q := NOT CLK AND NOT M;
M := NOT CLK;
END_FUNCTION_BLOCK