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Performance and Reliability of Fault-Tolerant Ethernet Networked Control Systems
註釋This chapter has discussed the performance and reliability of fault-tolerant Ethernet Networked Control Systems. The use of Gigabit Ethernet in networked control systems was investigated using the OPNET simulator. Real-time traffic and non-real time traffic were integrated without changing the IEEE 802.3 protocol packet format. In a mixed traffic industrial environment, it was found that standard Gigabit Ethernet switches succeeded in meeting the required time constraints. The maximum speed of operation of individual machines and fault tolerant production-lines was also studied. The reliability and availability of fault tolerant production lines was addressed next. It was shown how to use Markov models to find the most cost-effective way of increasing the Mean Time To Failure MTTF. Improved techniques for modeling repair were also discussed. Finally, it was shown how to introduce fault tolerance at the sensor level in order to increase production line mission time.