Architecture

1 Standalone PAC

2 BMENUA0100 with control port disabled

3 BMENOC0321 Ethernet communications module

4 X80 Ethernet RIO drop

5 Distributed equipment

6 OPC UA client (SCADA system)

7 Engineering workstation with dual Ethernet connections

8 Ethernet RIO main ring

9 Dual ring switch (DRS)

Description

This architecture features a hierarchical network, which relies on BMENOC0321 communication modules to route network traffic between subnets. Upstream communication from the PACs to the OPC UA clients (SCADA systems) is accomplished via the dual device network ports of the BMENOC0321 module, 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 (2) is disabled for each standalone PAC. IPv4 Ethernet communication to the BMENUA0100 module is provided over the backplane port.

Configuration 1 includes two PACs that reside in the same subnet. This configuration employs the BMENOC0321 module to provide redundant upstream communications to the redundant SCADA servers. The BMENOC0321 module employs the RSTP redundancy protocol to avoid logical Ethernet loops. The dual device network ports of the two CPUs provide downstream communication to the distributed Ethernet equipment.

Configuration 2 includes a single PAC, with X80 Ethernet RIO drop. This PAC uses the BMENOC0321 module for upstream communication to the redundant SCADA servers. The BMENOC0321 accomplishes this using two independent subnets. Downstream communication from the X80 Ethernet RIO drop is provided by both the CRA service port and a BMENOS0300 switch to distributed Ethernet equipment.