tailieunhanh - AUTOMATION & CONTROL - Theory and Practice Part 9

Tham khảo tài liệu 'automation & control - theory and practice part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Intelligent Network System for Process Control Applications Challenges Approaches 191 Fig. 6. Update in ontology provided by distributed field device agent Central Process This process handles core mechanism that glues organization s local processes to the central process. Some of the functions for example library of agents their job description definition of controller tasks and domain ontology of each cluster can be defined offline before the implementation actually starts. The dynamic components are removing of agent deadlocks security of agents estimation of characteristics and relationships and decision making in cases of emergencies and when situation develops beyond the capabilities of agent clusters. It seems that all of these dynamic functions together may require computations but the advantages gained are many i reduced communications between central process controller and the device s ii provide simplicity to enable better interoperability iii intelligence gathering to build a degree of reconfigurability in a case estimated parameters exceed beyond a limit iv reduced human supervision. It can be also argued that complexity of this process is only a technology mismatch and that if only small scale changes are to be decided at the central process like reconfiguration of device parameters security of agents then intelligence can further be distributed to the agents at the local level. Based on presented work in section 3 and in agents can be embedded in tagged devices within a layered architecture to support business operations and services in real time. In Figure 7 the model architecture of four tiers is drawn to implement objectives of the central process. At the bottom layer Tier 1 active readers or Profibus Profinet enabled devices collect data often collected on a trigger similar to a motion sensor. These readers should be controlled by one and only one edge server to avoid problems related to network partitioning. In addition this layer .

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