FUNCTION_BLOCK Example

VAR_INPUT
	temp:	REAL;
END_VAR

VAR_OUTPUT
	hot_valve:	REAL;
	cold_valve:	REAL;
END_VAR

FUZZIFY temp
	TERM hot	:=	(1,0)(70,0)(90,1);
	TERM cold	:=	(1,1)(50,1)(80,0);
END_FUZZIFY

DEFUZZIFY hot_valve
	TERM open	:=	100;
	TERM closed	:=	0;
	METHOD : COGS;
	DEFAULT		:= 0;	
END_DEFUZZIFY

DEFUZZIFY cold_valve
	TERM open	:=	100;
	TERM closed	:=	0;
	METHOD : COGS;
	DEFAULT		:= 0;
END_DEFUZZIFY

RULEBLOCK Control
	AND: MIN;
	ACCU: MAX;
	RULE 1:	IF temp IS cold THEN hot_valve IS open;
	RULE 2: IF temp IS hot THEN cold_valve IS open;
END_RULEBLOCK


END_FUNCTION_BLOCK