Download to read offline
Uploaded byDr Reeja S R
Sa unit-2-three-vignets
The document describes a 5-level hierarchical process control system with the bottom three levels being object-oriented for process measurement, supervision, and management. The top two levels integrate conventional databases for plant and corporate management functions. It also discusses using a rule-based system with an interpretation engine that executes rules based on the current working memory state, and a blackboard model with independent knowledge modules that operate within hierarchical levels.
More Related Content
Sa unit-2-three-vignets
- 1. Three Vignettes inmixed style Distributed process control Dr Reeja S R Professor CSE Dept. SJEC, Vamanjoor, Mangalore
- 2. 3-Vignettes • Plan managementsystem – Process control with plant management. • Information system – Five level layered hierarchy. – 1: process measurement and control – 2:process supervision for monitoring and controlling – 3:Process management- computer based plant automation- reports, optimization guidance. – 4,5: Plant and corporate management-cost accounting, inventory control, order processing , scheduling..
- 3. Three vignettes inmixed styleThree vignettes in mixed style
- 4. • In theabove model – Layers 1-3 are object oriented – Layers 4-5 are conventional data repository model.
- 5. Operating parameters: Currentprocess value, target value, output and mode-automatic or manual Tuning parameters: gain, reset, derivative, alarm trip-points Configuration parameters: tag-name and I/O Channels
- 6. Operating parameters: Currentprocess value, target value, output and mode-automatic or manual Tuning parameters: gain, reset, derivative, alarm trip- points Configuration parameters: tag-name and I/O Channels Templates Algorithms Communication services
- 7. • Layer 4and 5: integrates conventional host computer and conventional database management. • Data collection facilities of level 3 and reporting facilities of level 2 provide process information as transactions processing functions –supports central data store.
- 8. Rule based systemRulebased system
- 9. Rule based system •Pseudocode: code to be executed- knowledge base. • Interpretation engine: Rule interpreter • Control state of the interpretation engine: rule and data element • Current state of the program Working memory. IT CALLS SET OF RULES WHOSE CONTROL RELATIONS ARE DETERMINED DURING EXECUTION BY THE STATE OF THE COMPUTATION It provides a virtual machine to support this model.
- 10. A blackboard globallyrecast as an interpreterA blackboard globally recast as an interpreter
- 11. Black board • Solutionis organized into application dependent hierarchies • Domain knowledge is partitioned into independent modules of knowledge that operate on knowledge within levels