AnnexF/hysteresis_st.txt
author mjsousa
Thu, 22 Aug 2013 16:53:17 +0100
changeset 843 f9a059c24aea
parent 0 fb772792efd1
permissions -rwxr-xr-x
Fill in the 'datatype' anotation in the identifiers of symbolic variables.
(even though currently it is not being used).
FUNCTION_BLOCK HYSTERESIS
    (* Boolean hysteresis on difference *)
    (* of REAL inputs, XIN1 - XIN2      *)
  VAR_INPUT XIN1, XIN2, EPS : REAL; END_VAR
  VAR_OUTPUT Q : BOOL := 0; END_VAR
  IF Q THEN IF XIN1 < (XIN2 - EPS) THEN Q := 0; END_IF ;
  ELSIF XIN1 > (XIN2 + EPS) THEN Q := 1 ;
  END_IF ;
END_FUNCTION_BLOCK