Installation manual

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Presentation,
setup
Modicon TSX Micro
automation platform 0
PL7 FUZ software for fuzzy logic processing
PL7 FUZ software is a PL7 TSX Micro/Junior/Pro software option enabling fuzzy
logic processing in order to optimise the control of processes from Micro and
Premium PLCs. This is a software function which can be integrated in any
PL7 program. lt includes setup and debug tools.
This function is particularly suitable for controlling:
b Systems which are difficult to model or non-linear systems, with wide variation of
inputs or an insufficient sensor resolution.
b Systems which are difficult to control and require experience and human intuition.
It enables:
b Boolean logic limits to be exceeded (true or false state).
b The representation of physical measurements by gradual concepts.
b Benefit to be gained from the expertise of operators when controlling a proces.s
The fuzzy logic function is characterised by:
b 5 physical measurements used as inputs (temperature, pressure, speed…).
b 20 graphic related functions which allow the physical measurement inputs to be
represented by predefined associated linguistic terms. A temperature will be
represented for example by the terms: low, average, high according to the limits for the
various terminals.
b 25 linguistic rules which determine the state to be applied to the outputs
(3 conditions and 2 conclusions per rule).
b 4 numerical variables as outputs, results applying to the function input values
b The possibility of debugging its control offline.
Once inserted in a program, the fuzzy function can either operate in continuous mode
(function executed on each scan) or on request (a single iteration on each
execution). The operating mode enables the function to be used in automatic mode
(calculation of the outputs depending on the state of the inputs) or in manual mode
(applications with predefined output values).
The fuzzy logic function software is set up in 2 steps:
b Integration of the fuzzy function in the application program, in the same way as any
other standard function.
b Setting the fuzzy function parameters using the setup screen.
The fuzzy logic function is inserted in the program in all the available languages.
The software checks the various function parameters:
b The 5 input variables.
b The 4 output variables (plus an error bit).
b The internal variables necessary for the function to operate correctly.
The function setup screen is used to access parameters (I/O), membership
functions, linguistic rules, as well as debug functions.
The membership functions are described intuitively using a suitable layout.
A membership function is characterised by:
b The selection of one of the parameters (I/O).
b The choice of associated linguistic terms from a library of terms predefined or
created by the user.
b The type of function to apply for the inputs (trapeze, triangle, etc) as well as its
characteristic values and the functions to apply for the outputs (singleton).
Presentation
Software setup
Integration in the program
Membership functions
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Courtesy of Steven Engineering, Inc. ● 230 Ryan Way, South San Francisco, CA 94080-6370 ● General Inquiries: [phone] ● www.stevenengineering.com
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