66 lines
1.5 KiB
Plaintext
66 lines
1.5 KiB
Plaintext
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// Block definition (there may be more than one block per file)
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FUNCTION_BLOCK tipper
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// Define input variables
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VAR_INPUT
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service : REAL;
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food : REAL;
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END_VAR
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// Define output variable
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VAR_OUTPUT
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tip : REAL;
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END_VAR
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// Fuzzify input variable 'service'
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FUZZIFY service
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TERM poor := (0, 1) (4, 0) ;
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TERM good := (1, 0) (4,1) (6,1) (9,0);
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TERM excellent := (6, 0) (9, 1);
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RANGE := (0.0 .. 9.0); // Added range for service
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END_FUZZIFY
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// Fuzzify input variable 'food'
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FUZZIFY food
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TERM rancid := (0, 1) (1, 1) (3,0) ;
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TERM delicious := (7,0) (9,1);
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RANGE := (0.0 .. 9.0); // Added range for food
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END_FUZZIFY
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// Defzzzify output variable 'tip'
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DEFUZZIFY tip
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TERM cheap := (0,0) (5,1) (10,0);
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TERM average := (10,0) (15,1) (20,0);
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TERM generous := (20,0) (25,1) (30,0);
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// Use 'Center Of Gravity' defuzzification method
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METHOD : COG;
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// Default value is 0 (if no rule activates defuzzifier)
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DEFAULT := 0;
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RANGE := (0.0 .. 30.0); // Added range for tip
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END_DEFUZZIFY
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RULEBLOCK No1
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// Use 'min' for 'and' (also implicit use 'max'
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// for 'or' to fulfill DeMorgan's Law)
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AND : MIN;
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// Use 'min' activation method
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ACT : MIN;
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// Use 'max' accumulation method
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ACCU : MAX;
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RULE 1 : IF service IS poor OR food IS rancid
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THEN tip IS cheap;
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RULE 2 : IF service IS good
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THEN tip IS average;
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RULE 3 : IF service IS excellent AND food IS delicious
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THEN tip is generous;
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END_RULEBLOCK
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END_FUNCTION_BLOCK
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