Architecture

1 Primary Hot Standby PAC

2 Standby Hot Standby PAC

3 BMENUA0100 with control port disabled

4 BMENOC0321 Ethernet communications module

5 Ethernet RIO main ring

6 X80 Ethernet RIO drop

7 Distributed equipment

8 BMENOS0300 switch

9 Dual ring switch (DRS)

10 OPC UA client (SCADA system)

11 Engineering workstation with dual Ethernet connections

Description

This architecture features a hierarchical network, which relies on BMENOC0321 communication modules (4) to route network traffic between subnets. Upstream communication from the Hot Standby PACs to the OPC UA clients (SCADA systems) is accomplished via the dual device network ports of the BMENOC0321 modules, using the RSTP redundancy protocol to avoid logical Ethernet loops.

NOTE: This architecture requires the configuration of static routes in the control network equipment to redirect the various subnets of the several CPU PACs.

The BMENUA0100 control port (3) is disabled for each PAC. IPv4 Ethernet communication to the BMENUA0100 module is provided over the backplane port.

This configuration employs the BMENOC0321 module to provide redundant upstream communications via redundant connections to the redundant SCADA servers. The dual device network ports of the CPUs provide downstream communication to the X80 Ethernet RIO drops. Farther downstream communication from the X80 Ethernet RIO drop to the distributed Ethernet equipment is provided by both the CRA service port and a BMENOS0300 switch (8).