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AnnexF/hysteresis_st.txt
author mario
Wed, 14 Nov 2007 08:54:25 +0100
changeset 85 a6e651ba55c2
parent 0 fb772792efd1
permissions -rwxr-xr-x
Fixing handling of enumeration values;
Adding syntax check in formal and non-formal FB invocations
Cleaning up some rules. 
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
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