In a distributed control system in which a plurality of nodes are connected to a transmission line, each node controlling components connected to this node and transmitting a message to other nodes, a message sent by each node includes at least two message-sending condition-identifying portions, one...http://www.google.com/patents/US20040153174?utm_source=gb-gplus-sharePatent US20040153174 - Distributed control system and filtering method used in the distributed control system
