Figure 9.4.1 Dual-net full duplex mode sharing the RCB block instance
Net A and Net B share the same report control block (abbreviated as RCB) enabled by the client.
IED sends undifferentiated date through dual-net to the clients. If one net is physically
disconnected, the flag of RCB instance (i.e.: “RptEna” in above figure) is still “true”. Only when
both Net A and Net B are disconnected, the flag of the RCB instance will automatically change to
“false”.
In normal operation status of this mode, IED provides the same MMS service for Net A and Net B.
If one net is physically disconnected (i.e.: “Abnormal operation status” in above figure), the
working mode will switch to single-net mode seamlessly and immediately. Network communication
supervision is unnecessary here, and Buffered Report Control Block (abbreviated as BRCB) need
not to be used. On the other net, date alternation works normally. Therefore, MMS service can
interact normally without interruption. This mode ensures no data loss during one net is in
abnormal operation status.
In this mode, one report will be transmitted twice via dual nets for the same report instance, so the
client needs to distinguish whether two reports are same according to corresponding EntryIDs.
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