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3 Operating the Ethernet CP with STEP 7/NCM S7
3.6
Media Redundancy tab
3.6.1
Media redundancy options
To increase the availability of an Industrial Ethernet network with optical or
electrical bus topologies, there are several options available:
S Mesh networks
S Parallel connection of transmission paths
S Closing a linear bus topology to form a ring topology
3.6.2
Media redundancy in ring topologies
Structure of a ring topology
Nodes in a ring topology can be external switches and/or the integrated switched
of communications modules.
To set up a ring topology with media redundancy, the two free ends of a linear
network topology must be brought together in one device. The closing of the linear
bus topology to form a ring is achieved with two ports (ring ports) of a device in the
ring. This device is the redundancy manager. All other devices in the ring are
redundancy clients.
Figure 3-6
Devices in a ring topology with media redundancy
The two ring ports of a device are the ports that establish the connection to its two
neighboring devices in a ring topology. The ring ports are selected and set during
the configuration of the device. On the module, the ring ports are indicated by "R"
after the port number.
A−88
S7-CPs for Industrial Ethernet Configuring and Commissioning
Release 07/2010
C79000−G8976−C182−10
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