ABB RMC-100 - Remote Access in 2 Network Mode (Logical Diagram); Local Access in 2 Network Mode (Logical Diagram)

2105552MNAE | RMC-100 | 63
The 2-Network mode isolates traffic on each of the RMC Ethernet ports. Isolating or routing traffic
depends on your field requirements and available network equipment. Obtain valid IP parameters for
configuration.
IMPORTANT NOTE:
The configuration to support routing between the networks is not detailed in
this manual. If an external router is used, ensure its IP address is also configured (Gateway
parameter). The examples shown in this section assume no external routing between subnets.
If there are
any XIOs at the field site, consider using an XIO i
n port forwarding mode. This function
allows
isolation of the field network from the WAN connection, while allowing the traffic to specific
TCP ports
on field devices to flow from the WAN. For more information on the XIO port forwarding
feature, see the XI
O User Manual or the Network Communication Guide. (Links to documents
provided in
Additional information.)
4.7.1 Remote access to RMC by host (logical diagram)
The 2 Network mode supports remote access to the RMC (through the port used for the network
uplink) but does not support access to any devices attached to the other port. Attached devices
remain isolated unless an external router is installed to provide communication between the two
subnets.
Figure 4-22
shows the two logical subnets resulting from the 2 Network mode: E1-LAN and E2-LAN.
Establish a remote connection to the RMC using the IP address assigned to the Ethernet port used for
the corporate network uplink (in this example, E1). Additional ABB devices (in this example, XIO 1
and XIO 2) are daisy-chained to the RMC through port E2. The host cannot access those devices since
the RMC isolates these devices from the WAN. IP addresses assigned to the XIOs are not reachable
from the host.
Figure 4-22: Remote access to RMC in 2 Network mode
Legend for Figure 4-22: Remote access to RMC in 2 Network mode
1
Host system with PCCU
2
Customer Wide Area Network (WAN)
3
RMC (2 Networks mode): E1-LAN
4
RMC (2 Networks mode): E2-LAN
4.7.2 Local access to RMC/daisy chained devices (logical
diagram)
Figure 4-23 shows access to the RMC and daisy-chained devices. Connect to the RMC and daisy-
chained devices through the subnet associated with port E2 (E2-LAN).