Rockwell Automation RSLogix 5000 Fuzzy Designer - Manual (Page 45)

Publication LOGIX-UM004A-EN-P - March 2007
FuzzyDesigner Component Library 45
Connections
The input logical link of the output Takagi-Sugeno variable can be
connected to a component providing a DOF value (as result of fuzzy
inference), that is, the Rule Block component.
EXAMPLE
Different linear-state feedback controllers are to be smoothly activated for different process states and
setpoints – scheduling controller gains. There are three rules.
• IF (x1 IS A1 ) AND (x2 IS B1) THEN y = K0 + K1*x1 + K2*x2 (= y1)
• IF (x1 IS A2 ) AND (x2 IS B2) THEN y = G0 + G1*x1 + G2*x2 (= y2)
• IF (x1 IS A3 ) AND (x2 IS B3) THEN y = C0 (= y3)
Defined (functional) terms:
K, type LINEAR, parameters = K0 K1 K2
G, type LINEAR, parameters = G0 G1 G2
C, type CONSTANT, parameters = C0
x1
x2 y
from a rule block
to a rule block
y1*DOF(K) + y2*DOF(G) + y3*DOF(C)
DOF(K) + DOF(G) + DOF(C)
y =
y = Default Value, if all DOFs = 0
Evaluation (weighted average of functions):