ABB XIO-00 - Page 185

XIO USER MANUAL | 2106424MNAB | 185
ports (the RMC behaves as a 2-port switch, 1 network), or as separate ports (2 networks). When
connecting XIOs to RMCs, consider the following:
— An RMC in 1-Network mode forwards traffic between the network and daisy chained XIOs
transparently.
— An RMC in 2-Network mode isolates daisy-chained XIOs in the field, as traffic received on the
RMC’s network uplink port will not be automatically switched (forwarded) to the port with the
daisy-chained XIOs. Plan connections carefully to ensure that access to devices is available as
required. For remote access to the XIOs, a router is required. Figure 9-3
shows local access on
one of the networks associated with one of the RMC Ethernet ports (for example E2).
Figure 9-3: RMC on 2-Network mode supports local access only
Legend: RMC on 2-Network mode supports local access only
ID
Name
ID
Name
1
Customer (TCP/IP) network
3
RMC: E2-LAN
2
RMC: E1-LAN
4
Local host system with PCCU
Figure 9-4 shows that remote access is only available to the RMC. Access to the XIOs is not possible in
this scenario as the RMC does not route between E1 and E2. Traffic from the network is not forwarded to
the XIOs.
Figure 9-4: RMC on 2-Nework mode isolates XIOs on local field network
Legend: RMC on 2-Network mode isolates XIOs on local field network
ID
Name
ID
Name
1
Local host system with PCCU
3
RMC: E1-LAN
2
Customer (TCP/IP) network
4
RMC: E2-LAN