Rockwell-automation RSLogix 5000 Fuzzy Designer User Manual download pdf (Page 109)

Publication LOGIX-UM004A-EN-P - March 2007

FuzzyDesigner Projects 109

Operations with Rules

You can add, create, or delete rules.

Adding a Rule

To add a rule, click the first available blank row and a new rule with

the correct index will be created. Repeat this if you want to add more

rules.

Creating a Rule

With the Rule Editor, you can make or modify the rule base of the

selected Rule Block. Each rule has the following assigned to it:

• Index - the position of the rule in the rule base, usually greater

than zero

• Activity flag check box - if checked, the rule is enabled,

otherwise it is disabled

• DOF

An active rule is evaluated during the inference process and might

influence the fuzzy system output. Inactive rules remain in the

database but are not evaluated.

Temporarily enabling and disabling rules can help you fine-tune your

fuzzy system.

The rule specification contains the premise variables and weighted

consequent variables. The rule base columns in the Rule Editor are

arranged in the same order as the related variable links are applied.

If you want to create a rule, then use a mouse. Select the table cell

you want to modify and choose the required parameter. By clicking

on the cell with the rule activity, you can set the rule as active

(checked) or inactive (unchecked). When you click the cell of the

premise or consequent variable, choose the required term from the

visualized combo box. All relevant terms of the respective variables

are offered including their inverses. The rule base is the only place

where you can apply the fuzzy logic NOT operator. Inversed terms

are marked by NOT followed by the term name.

In the rule base table, the OR operator can also be used.

1. Select OR in the combo box, then check the terms that you want

to use in the OR expression (see OR Expression Editor).

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Rockwell-automation RSLogix 5000 Fuzzy Designer User Manual Page 109