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FUNCTION_BLOCK Mamdani-Tip-Calculator
VAR_INPUT
FoodQuality: REAL;
Service: REAL;
END_VAR
VAR_OUTPUT
Tip: REAL;
CheckPlusTip: 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 := (0.000 .. 30.000);
TERM AboutTenPercent := Gaussian 10.000 2.000;
TERM AboutFifteenPercent := Gaussian 15.000 2.000;
TERM AboutTwentyPercent := Gaussian 20.000 2.000;
METHOD : COG;
ACCU : ASUM;
DEFAULT := nan;
END_DEFUZZIFY
DEFUZZIFY CheckPlusTip
RANGE := (1.000 .. 1.300);
TERM PlusAboutTenPercent := Gaussian 1.100 0.020;
TERM PlusAboutFifteenPercent := Gaussian 1.150 0.020;
TERM PlusAboutTwentyPercent := Gaussian 1.200 0.020;
METHOD : COG;
ACCU : ASUM;
DEFAULT := nan;
END_DEFUZZIFY
RULEBLOCK
AND : PROD;
OR : MAX;
ACT : MIN;
RULE 1 : if FoodQuality is Bad and Service is Bad then Tip is AboutTenPercent and CheckPlusTip is PlusAboutTenPercent
RULE 2 : if FoodQuality is Bad and Service is Good then Tip is AboutFifteenPercent and CheckPlusTip is PlusAboutFifteenPercent
RULE 3 : if FoodQuality is Good and Service is Bad then Tip is AboutFifteenPercent and CheckPlusTip is PlusAboutFifteenPercent
RULE 4 : if FoodQuality is Good and Service is Good then Tip is AboutTwentyPercent and CheckPlusTip is PlusAboutTwentyPercent
END_RULEBLOCK
END_FUNCTION_BLOCK
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