Distributed Ain't Dead!!

The original distributed control system was the FUNCTIONAL distribution of the central mainframe computer; it provided a distributed risk of system failure similar to that of stand-alone controllers. Microprocessors began to assume a more aggressive role in both consumer and commercial markets, and the increase in volume brought prices down. Industrial markets were then able to apply “big computer” capability too much smaller process solutions. Operating data must be transformed into meaningful information for those immediately managing the process itself. Performance data must be arranged to be useful to plant engineers, to continually improve the product, and to reduce plant operating costs. The need for higher quality, environmental responsibility, operational accountability and government compliance all requires tighter control, closer management, and extensive record keeping. The advent of fieldbus-type communication seems to invite more local operator interfaces to serve immediate needs at different positions around the plant or process.