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<center><h3> FCL Example </h3></center>

This is an example of a Fuzzy Control Language (FCL) program:<p>

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<pre>
// Block definition (there may be more than one block per file)
FUNCTION_BLOCK tipper

// Define input variables
VAR_INPUT
    service : REAL;
    food : REAL;
END_VAR

// Define output variable
VAR_OUTPUT
    tip : REAL;
END_VAR

// Fuzzify input variable 'service'
FUZZIFY service
    TERM poor := (0, 1) (4, 0) ; 
    TERM good := (1, 0) (4,1) (6,1) (9,0);
    TERM excellent := (6, 0) (9, 1);
END_FUZZIFY

// Fuzzify input variable 'food'
FUZZIFY food
    TERM rancid := (0, 1) (1, 1) (3,0) ;
    TERM delicious := (7,0) (9,1);
END_FUZZIFY

// Defzzzify output variable 'tip'
DEFUZZIFY tip
    TERM cheap := (0,0) (5,1) (10,0);
    TERM average := (10,0) (15,1) (20,0);
    TERM generous := (20,0) (25,1) (30,0);
    // Use 'Center Of Gravity' defuzzification method
    METHOD : COG;
    // Default value is 0 (if no rule activates defuzzifier)
    DEFAULT := 0;
END_DEFUZZIFY

RULEBLOCK No1
    // Use 'min' for 'and' (also implicit use 'max'
    // for 'or' to fulfill DeMorgan's Law)
    AND : MIN;
    // Use 'min' activation method
    ACT : MIN;
    // Use 'max' accumulation method
    ACCU : MAX;

    RULE 1 : IF service IS poor OR food IS rancid 
                THEN tip IS cheap;

    RULE 2 : IF service IS good 
                THEN tip IS average; 

    RULE 3 : IF service IS excellent AND food IS delicious 
                THEN tip is generous;
END_RULEBLOCK

END_FUNCTION_BLOCK
</pre>
</td></tr></table>
<table border=0 align=center bgcolor=#aaaaaa><tr><td align=center> See FCL code detailed explanation <a href="fcl.html"><b>here</b></a></td></tr></table>
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				<p style="font-size: 8pt" align=center><font color=#777777> - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - </font></p>
					<center><b>Author: <a class="body" href="http://www.mcb.mcgill.ca/~pcingola/">Pablo Cingolani</a> (pcingola@users.sourceforge.net</a>)</b></center>
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Key words (for search engines): <br>
	Fuzzy logic <br>
	Fuzzy logic software <br>
	Fuzzy logic package <br>
	Fuzzy logic library <br>
	Fuzzy logic sourceforge sf.net <br>
	Open source <br>
	GNU <br>
	GPL LGPL <br>
	java <br>
	Windows Linux OSX <br>
	FCL <br>
	IEC 1131 <br>
	IEC 61131 <br>
	IEC 61131 part 7 <br>
	IEC 61131-7 <br>
	<a href="http://en.wikipedia.org/wiki/Fuzzy_logic">Fuzzy logic Wikipedia</a> <br>
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