Rockwell-automation RSLogix 5000 Fuzzy Designer User Manual Page 12

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Publication LOGIX-UM004A-EN-P - March 2007
12 Get Started with FuzzyDesigner
Fuzzy Logic and Fuzzy Control Essentials
This section introduces basic concepts used in a Fuzzy Add-On
Instruction. The designer should know how to deal with an
instruction’s inputs, outputs, and fuzzy If-Then rules that will be used
to define input-output mapping.
There are quite a number of systems or processes that are highly
nonlinear, not well understood from the formal description point of
view, or for which a mathematical model is not readily available. For
these systems or processes, there is often an expert that is capable of
supervising or controlling the process in a satisfactory manner. The
figure Nonlinear System Example illustrates the difference between
linear and nonlinear systems.
Nonlinear System Example
The decision making the expert uses in control system supervision
can be expressed as a set of Fuzzy Logic If-Then rules.
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