IEC 61131-7 PDF

Figure A. Table A. Fuzzy control is emerging as a technology that can enhance the capabilities of industrial automation, and is suitable for control level tasks generally performed in Programmable Controllers PC. Fuzzy control is based upon practical application knowledge represented by so-called linguistic rule bases, rather than by analytical either empirical or theoretical models. Fuzzy control can be used when there is an expertise that can be expressed in its formalism.

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Figure A. Table A. Fuzzy control is emerging as a technology that can enhance the capabilities of industrial automation, and is suitable for control level tasks generally performed in Programmable Controllers PC. Fuzzy control is based upon practical application knowledge represented by so-called linguistic rule bases, rather than by analytical either empirical or theoretical models. Fuzzy control can be used when there is an expertise that can be expressed in its formalism.

Its wide range of applications and natural approach based on human experience makes fuzzy control a basic tool that should be made available to programmable controller users as a standard. Fuzzy control can also, in a straightforward way, be combined with classical control methods. The application of fuzzy control can be of advantage in such cases where there is no explicit process model available, or in which the analytical model is too difficult to evaluate or when the model is too complicated to evaluate in real time.

Another advantageous feature of fuzzy control is that human experience can be incorporated in a straightforward way. Also, it is not necessary to model the whole controller with fuzzy control: sometimes fuzzy control just interpolates between a series of locally linear models, or dynamically adapts the parameters of a "linear controller", thereby rendering it non-linear, or alternatively just "zoom in" onto a certain feature of an existing controller that needs to be improved.

Fuzzy control is a multi-valued control, no longer restricting the values of a control proposition to "true" or "false". This makes fuzzy control particularly useful to model empirical expertise, stating which control actions have to be taken under a given set of inputs.

The existing theory and systems already realized in the area of fuzzy control differ widely in terms of terminology definitions , features functionalities and implementation tools. Fuzzy control is used from small and simple applications up to highly sophisticated and complex projects. To cover all kinds of usage in this part of IEC , the features of a compliant fuzzy control system are mapped into defined conformance classes.

The basic class defines a minimum set of features which has to be achieved by all compliant systems. This facilitates the exchange of fuzzy control programs. Fuzzy control programs applying these features can only be fully ported among systems using the same set of features, otherwise a partial exchange may be possible only. This standard does not force all compliant systems to realize all features in the extension class, but it supports the possibility of partial portability and the avoidance of the usage of non-standard features.

Therefore, a compliant system should not offer non-standard features which can be meaningfully realized by using standard features of the basic class and the extension class. In order not to exclude systems using their own highly sophisticated features from complying with this part of IEC and not to hinder the progress of future development, this standard permits also additional non-standard features which are not covered by the basic class and the extension class. However, these features need to be listed in a standard way to ensure that they are easily recognised as non-standard features.

The portability of fuzzy control applications depends on the different programming systems and also the characteristics of the control systems. These dependencies are covered by the data check list to be delivered by the manufacturer. This is a free 11 page sample.

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As IEC 61131.7-2004 Programmable Controllers Fuzzy Control Programming

Since IEC holds the copyright, there are no downloadable versions of the standard available. The International Standard IEC provides a complete collection of standards on programmable controllers and their associated peripherals. It consists of the following parts: IEC General information Contains the definitions and identifies the principal characteristics relevant to the selection and application of programmable controllers and their associated peripherals. Current edition is 2. Current edition is 4.

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