Abstract

Modern distributed control systems are becoming increasingly difficult to compare with one another because of their diversity, heterogeneity and complexity. Most manufacturers do not specify any recognizable classification basis, and criteria for such a classification and judgment are missing. An attempt is made here to demonstrate the main new possibilities of distributed process control with microcomputers, data buses and video display units against a background of the orthodox method of totally parallel instrumentation and the totally centralized operation with conventional DDC process computers. References are made to suitable and advantageous structures for distributed systems, a list of criteria being adhered to at the same time. A general classification of distributed control systems is provided to permit the easier attainment of an overview.

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