NR Electric PCS-9611, Instruction Manual

Page: 244 / 300

10 Communication
PCS-9611 Feeder Relay
10-10
Date: 2014-04-08
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 du ring one net is in
abnormal operation status.
In mode 1, 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.
Client
IED (Server)
Report Control Block
Report Instance 1
RptEna = true
Net A Net B
Client
IED (Server)
Report Control Block
Report Instance 1
RptEna = true
Net A Net B
Normal operation status Abnormal operation status
TCP Link MMS Link
Figure 10.4-1 Dual-net full duplex mode sharing the RCB block instance
2. Mode 2: Dual-net hot-standby mode sharing the same RCB instance
Client
Net A Net B
Client
Net A Net B
IED (Server)
Report Control Block
Report Instance 1
RptEna = true
IED (Server)
Report Control Block
Report Instance 1
RptEna = true
Normal operation status Abnormal operation status
Standby MMS Link TCP Link MMS Link
Figure 10.4-2 Dual-net hot-standby mode sharing the same RCB instance
In mode 2, the MMS service is provided on main MMS link, no MMS service interacts on the
standby MMS link. The definitions of two links are as follows:

Main MMS Link: Physically connected, TCP level connected, MMS report service available.