Rockwell Automation RSLogix 5000 Fuzzy Designer - Manual (Page 18)

Publication LOGIX-UM004A-EN-P - March 2007
18 Get Started with FuzzyDesigner
Feedback Control System with Direct Fuzzy Controller
A fuzzy controller with the above structure typically handles multiple
inputs and generates multiple outputs. This system is recommended
for experienced designers since control variables are direct functions
of rules. The number of rules increases rapidly with the number of
inputs and fuzzy terms for inputs. The problem of dimensionality can,
however, be reduced by hierarchical structuring of the rule base of the
controller, which is supported by FuzzyDesigner.
Specifications and Features
FuzzyDesigner features and specifications are summarized in the
following tables.
For details, refer to the subsequent chapters.
Fuzzy System Components
Components are graphical objects, blocks you work with, to design a
fuzzy system.
PLANT
PLANT
FUZZY
CONTROLLER
Control
Variables
Setpoints
Input filter Output filter
Control system status Primary controls
Process Variables
PLANT
PLANT
FUZZY
CONTROLLER
Control
Variables
Setpoints
Input filter Output filter
Control system status Primary controls
Process Variables
Component Membership
functions AND OR Aggregation Inference
(Activation) Defuzzification
Type/method if applicable
Input Port
Input Linguistic
Variable Trapezoidal,
S-shape, and their
inverses
Rule Block Min/product
t-norms Max
Output
Linguistic
Variable Trapezoidal,
singleton Max s-norm Mamdani/ Fuzzy
Arithmetic CA/MCA/
MOM/SOM/ LOM
Output Port