分布式工业测控网DMCN中多主站组成的逻辑环维护算法

The Maintenance Algorithm of Logical Ring Composed of the Multi-Master-Stations in the Distributed Network DMCN for industrial Measure and Control

分布式工业测控网［１］中采用多主站组成的令牌总线逻辑环［２］，当逻辑环被破坏时，就执行逻辑维护算法．算法效率直接影响整个网络的效率，也是影响网络实时性的主要因素．本文针对这种类型的网络，提出了一种新的算法，采用“下站地址捎带技术”，从而降低整个网络逻辑环维护复杂性，使维护逻辑环时间得以减少．使网络的实时性得以保证．

The distributed network DMCN for industrial measure and control uses the token bus logical ring composed by multi-master-stations. If the logical ring is broken, the maintenance algorithm must be run. The efficience of the maintenance algorithm for logical ring directly affects the whole network's efficience. And it also plays an important role in keeping network's real-time. As to this kind of network, this paper proposes a new maintenance algorithm, uaing 'next address pickaback' technique. The alogrithm can reduce the complexity of the maintenance algorithm for logical ring and the time taken by recovery of the logical ring and keeps the network real -time.