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FUNCTION_BLOCK Linear-Tip-Calculator
VAR_INPUT
FoodQuality: REAL;
Service: REAL;
END_VAR
VAR_OUTPUT
Tip: REAL;
END_VAR
FUZZIFY FoodQuality
RANGE := (1.000 .. 10.000);
TERM Bad := Trapezoid 0.000 1.000 3.000 7.000;
TERM Good := Trapezoid 3.000 7.000 10.000 11.000;
END_FUZZIFY
FUZZIFY Service
RANGE := (1.000 .. 10.000);
TERM Bad := Trapezoid 0.000 1.000 3.000 7.000;
TERM Good := Trapezoid 3.000 7.000 10.000 11.000;
END_FUZZIFY
DEFUZZIFY Tip
RANGE := (10.000 .. 20.000);
TERM TenPercent := Linear 0.000 0.000 10.000;
TERM FifteenPercent := Linear 0.000 0.000 15.000;
TERM TwentyPercent := Linear 0.000 0.000 20.000;
METHOD : COGS;
DEFAULT := nan;
END_DEFUZZIFY
RULEBLOCK
AND : MIN;
RULE 1 : if FoodQuality is Bad and Service is Bad then Tip is TenPercent
RULE 2 : if FoodQuality is Bad and Service is Good then Tip is FifteenPercent
RULE 3 : if FoodQuality is Good and Service is Bad then Tip is FifteenPercent
RULE 4 : if FoodQuality is Good and Service is Good then Tip is TwentyPercent
END_RULEBLOCK
END_FUNCTION_BLOCK
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