Abstract: SOA (Service Oriented Architecture) has been used wildly in traditional information system area. But how to construct a distributed control system widespread used in our society with the novel idea SOA is a new issue in service computing research area. With the characteristics of distributed control system and SOA, we proposed a layered rcaltime SOA model which could improve message transport reliability and real-time service processing. We discussed its detailed mechanism on message model, message transportation and service processing. Based on this model, we devc loped a multi net redundant real-time message bus prototype system for power distributed automation system and gave our results.

Key words: SOA, Real-time distributed control, Message bus, Multi net redundancy