By William E. Miller
Read or Download Distributed Computer Control Systems 1981. Proceedings of the Third IFAC Workshop, Beijing, China, 15–17 August 1981 PDF
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Extra info for Distributed Computer Control Systems 1981. Proceedings of the Third IFAC Workshop, Beijing, China, 15–17 August 1981
U COMPONENT LEVEL | if 1 iF J FOLLOW-UP H 1 CONTROL ♦ J CONTROL WITH 1 FIXED SET POINT \' SUB-SYSTEM 1 EXT. FAILURES M J SUB-SYSTEM Ί SUPERVISION SUB-SYSTEM INT. FAILURES J TRANSDUCER 1 SUPERVISION ' i POWER PLANT UNIT Fig, 2. Hierarchical structure of power plant automation. f IT 20 P. M. Larsen POWER PLANT T Active path Passive path (Transducers) 1 ELECTRONIC PANELS \ 1 vh \ 1 COMPUTER ROOM W "1 INPUT INTERFACE ·*"- — — - η 1 — PLANT UNIT CONTROL 1 ^ PROCESS COMPUTER T CTR Γ 1h i■ CONTROLLER I"•UNCT· cÏR0UP 1 h 1 Ί-Γ - Γ 1f 1 —r A\ — / , 1 Γ^ CONTROLLER \ POWER PLANT L T \ i -> i ' CENTRAL CONTROL ROOM ' OUTPUT INTERFACE -A— 1 / \f FUNCT.
In the first section of this paper, three ways of realization of parallelism in computer architecture will be discussed, resulting in three major types of multiple-computer systems. On the basis of the above general consideration of computer architecture, some typical architectures of distributed computer control systems will be analyzed by method of partitioning. When a distributed computer control system is considered in different partitions, it may appear to have various classes of configurations, each of which corresponds to the case of realization of a specific form of parallelism in its architecture.
The complexity of this subsystem and it's importance make it a key factor in the design and implementation of such systems. The major considerations surrounding the communications link are: o maximum allowable distance between connected devices Distributed Digital Control o environmental requirements of transmission line o susceptibility to transients and electrical noise o error detection/correction and error recovery techniques o data transfer security o signalling rate (bandwidth) and link loading o redundancy and failure effects o cable routing of redundant data links o communications protocols and bus mastership o type of information transferred between system devices There is one other consideration which is worthy of further elaboration.
Distributed Computer Control Systems 1981. Proceedings of the Third IFAC Workshop, Beijing, China, 15–17 August 1981 by William E. Miller