Download Display - Services

8. THE RULE ENTRY
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After definition of the membership functions, you can enter and modify the fuzzy rules.
The rules are entered in the main display. Fuzzy rules are entered in the form of a table
in P~oFuzzu.One column of the table corresponds to one fuzzy rule. Up to 50 rules
can be modified in PROFUZZY.
The number of the relevant fuzzy rule is displayed
above the corresponding column. The lines of the table are assigned to the defined
inputs and outputs a light-blue line being inserted as separating mark between the
inputs and outputs. The linguistic values of the membership functions of the inputs are
always AND linked in the rule table. An OR link can be implemented by letting
several fuzzy rules act on the same membership function of an output.
In the picture shown below, the fuzzy rules 8 and 9 are, for example:
8) IF temperature is hot AND outside temp is frost THEN heater is low
9) IF temperature is hot AND outside temp is cold THEN heater is low
Because of the logic operations on which the fuzzy system is based, these two rules can
also be expressed as follows:
IF temperature is hot AND (outside temp is frost OR outside temp is cold) THEN
heater is low
The rule table is divided into two blocks. The left block contains the designations of the
inputs and outputs and the right block the set of rules. After the start with a new
project, no rule has yet been defined and only the left block is shown on the screen. As
described in the preceding section, you can modify the membership functions by a
mouse click within this left block. The fuzzy rules are entered in the right block.
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To be able to modify a new column of the table, you must activate the add function.
When using the mouse, the add function is activated by positioning the mouse pointer
in the corresponding key field and clicking the left mouse key. The add function causes
a new, empty column to be created at the end of the table.
With keyboard operation, the add function is activated by operating the A key.
User Manual "PROFUZZY
C2 Siemens AG 1993, Order No.: 6ES5 834-3MG21