Designer Instruction Manual

Publication LOGIX-UM004A-EN-P - March 2007
42 FuzzyDesigner Component Library
Connections
The input link of the output linguistic variable can be connected to a
component providing the DOF value (as a result of fuzzy inference),
that is, the Rule Block component.
The output value link of the output linguistic variable can be
connected to components expecting a crisp value, such as:
• Output Port component.
• Input Linguistic Variable component.
• Output Takagi-Sugeno Variable component (only crisp values
are considered).
• PID component (only crisp values are considered).
The output logical link of the output linguistic variable can be
connected to components expecting the DOF value (as a result of
fuzzification or defuzzification), that is, the Rule Block component.
Parameters
• Name of the component
• Range of the output value of the component [y
min
, y
max
]
• List of terms described by
– The name
– The type of membership function
– The vector of membership function parameters [a, b, c, d] for
the trapezoidal membership function, [c] for the singleton
membership function
• Type of fuzzy inference
• Type of defuzzification method
• Default output value
Output Takagi-Sugeno Variable
The classical model by Takagi-Sugeno offers a fuzzy rule based,
smooth switching between analytical functions. The consequent is a
crisp function of the antecedent variables rather than a fuzzy
proposition. A general form of a Takagi-Sugeno model is:
R
i
: IF x is A
i
THEN y
i
= f
i
(x)