Specifications

Description
3.2 Network topologies
SCALANCE X-400 BA
24 Operating Instructions, 03/2009, C79000-G8976-C186-07
RM
RM
S7-200
S7-300
S7-400
SCALANCE X408-2
als Standby-Master
projektiert
SCALANCE
X414-3E
SCALANCE
X414-3E
Mbit/s
10/100
SCALANCE X408-2SCALANCE X414-3E
1000
Mbit/s
1000
Mbit/s
SCALANCE X414-3E
als Standby-Slave
projektiert
Figure 3-8 Redundant coupling of two subnets in mixed operation with SCALANCE X414-3E and
SCALANCE X408-2
In this case, network segments are rings with a redundancy manager (RM). The rings can
also be interrupted at one point (linear topology).
For a redundant link as shown in the figure, two devices must be configured within a network
segment. This configuration is set in Web Based Management, Command Line Interface or
using SNMP access. For more detailed information, refer to the configuration manual
"SCALANCE X-300 and SCALANCE X-400 Industrial Ethernet Switches". The two devices
connected in the configuration exchange data frames with each other to synchronize their
operating statuses (one device is master and the other slave). If there are no problems, only
the link from the master to the other network segment is active. If this link fails (for example
due to a link-down or a device failure), the slave activates its link as long as the problem
persists. Reconfiguration takes place within 0.3 s.
Note
If SCALANCE X408-2 are used exclusively for redundant coupling of the gigabit rings, the
coupling links can also be designed with a gigabit transmission rate.