tailieunhanh - Handbook of Industrial Automation - Richard L. Shell and Ernest L. Hall Part 5

Tham khảo tài liệu 'handbook of industrial automation - richard l. shell and ernest l. hall part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | required. It is rule-based expert controller the rules of which allow a faster startup of the plant and adapt the controller s parameters to the dynamic deviations of plant s parameters changing set-point values variations of output load etc. Allen-Bradley s programmable controller configuration system PCCS provides expert solutions to the programmable controller application problems in some specific plant installations. Also introduced by the same vendor is a programmable vision system PVS that performs factory line recognition inspection. Accol II of Bristol Babcock the language of its distributed process controller DPC is a tool for building of rule-based control systems. A DPC can be programmed using heuristic knowledge to behave in the same way as a human plant operator or a control engineer in the field. The incorporated inference engine can be viewed as a logical progression in the enhancement of an advanced high-level process control language. PICON of LMI is a real-time expert system for process control designed to assist plant operators in dealing with multiple alarms. The system can manage up to 20 000 sensing and alarm points and can store and treat thousands of inference rules for control and diagnostic purposes. The knowledge acquisition interface of the system allows building of relatively complex rules and procedures without requiring artificial intelligence programming expertise. In cooperation with LMI several vendors of distributed computer systems have incorporated PICON into their systems such as Honeywell Foxboro Leeds Northrup Taylor Instruments ASEA-Brown Bovery etc. For instance Leeds Northrup has incorporated PICON into a distributed computer system for control of a pulp and paper mill. Fuzzy logic controllers 13 are in fact simplified versions of real-time expert controllers mainly based on a collection of IF-THEN rules and on some declarative fuzzy values of input output and control variables classified as LOW VERY LOW SMALL VERY SMALL .