This sample standalone network builds upon the
two-subnet example, which includes communications on different subnets (red and green). In this case, the connections between the local racks and dual-ring switches facilitate redundant connections between the subnets:
1
A dual-ring switch connected to the Ethernet port of a BMENOC0321 module on the local rack creates a redundant link to the control network (red).
2
A BMENOR2200H module connects the local rack to distributed equipment (DNP3 devices, HMI) via the Ethernet backplane connection using redundant links.
3
A BMENOS0300 embedded switch module connects the local rack to distributed equipment (DNP3 devices) using redundant links.
4
The service port of a BMENOC0321 module allows distributed equipment (DNP3 devices, HMI) to communicate with the control network using redundant links.
5
RIO main ring
6
A BMENOS0300 embedded switch module on an RIO drop connects the RIO main ring to distributed equipment (DNP3 devices) using redundant links. 
