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lib/hysteresis_st.txt
author Mario de Sousa <msousa@fe.up.pt>
Thu, 31 Mar 2011 21:06:36 +0100
changeset 262 197ba42d78b2
parent 192 c6c2a3d487ac
child 276 1679f514f38a
permissions -rwxr-xr-x
Do not crash when checking semantics of undeclared symbolic_variable.
NOTE: this update may have broken the printing of error messages
during semantic analysis of IL code.
192
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FUNCTION_BLOCK HYSTERESIS
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    (* Boolean hysteresis on difference *)
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    (* of REAL inputs, XIN1 - XIN2      *)
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  VAR_INPUT XIN1, XIN2, EPS : REAL; END_VAR
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  VAR_OUTPUT Q : BOOL := 0; END_VAR
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  IF Q THEN IF XIN1 < (XIN2 - EPS) THEN Q := 0; END_IF ;
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  ELSIF XIN1 > (XIN2 + EPS) THEN Q := 1 ;
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  END_IF ;
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END_FUNCTION_BLOCK
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    10
 












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