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FUNCTION_BLOCK approximation of sin(x)/x
VAR_INPUT
inputX: REAL;
END_VAR
VAR_OUTPUT
outputFx: REAL;
trueFx: REAL;
diffFx: REAL;
END_VAR
FUZZIFY inputX
RANGE := (0.000 .. 10.000);
TERM NEAR_1 := Triangle 0.000 1.000 2.000;
TERM NEAR_2 := Triangle 1.000 2.000 3.000;
TERM NEAR_3 := Triangle 2.000 3.000 4.000;
TERM NEAR_4 := Triangle 3.000 4.000 5.000;
TERM NEAR_5 := Triangle 4.000 5.000 6.000;
TERM NEAR_6 := Triangle 5.000 6.000 7.000;
TERM NEAR_7 := Triangle 6.000 7.000 8.000;
TERM NEAR_8 := Triangle 7.000 8.000 9.000;
TERM NEAR_9 := Triangle 8.000 9.000 10.000;
END_FUZZIFY
DEFUZZIFY outputFx
RANGE := (-1.000 .. 1.000);
TERM f1 := 0.840;
TERM f2 := 0.450;
TERM f3 := 0.040;
TERM f4 := -0.180;
TERM f5 := -0.190;
TERM f6 := -0.040;
TERM f7 := 0.090;
TERM f8 := 0.120;
TERM f9 := 0.040;
METHOD : COGS;
DEFAULT := nan | NC;
END_DEFUZZIFY
DEFUZZIFY trueFx
RANGE := (-1.000 .. 1.000);
TERM fx := Function sin(inputX)/inputX;
METHOD : COGS;
DEFAULT := nan | NC;
END_DEFUZZIFY
DEFUZZIFY diffFx
RANGE := (-1.000 .. 1.000);
TERM diff := Function fabs(outputFx-trueFx);
METHOD : COGS;
DEFAULT := nan;
END_DEFUZZIFY
RULEBLOCK
RULE 1 : if inputX is NEAR_1 then outputFx is f1
RULE 2 : if inputX is NEAR_2 then outputFx is f2
RULE 3 : if inputX is NEAR_3 then outputFx is f3
RULE 4 : if inputX is NEAR_4 then outputFx is f4
RULE 5 : if inputX is NEAR_5 then outputFx is f5
RULE 6 : if inputX is NEAR_6 then outputFx is f6
RULE 7 : if inputX is NEAR_7 then outputFx is f7
RULE 8 : if inputX is NEAR_8 then outputFx is f8
RULE 9 : if inputX is NEAR_9 then outputFx is f9
RULE 10 : if inputX is any then trueFx is fx and diffFx is diff
END_RULEBLOCK
END_FUNCTION_BLOCK
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