
Active Components and Topologies
6-11
SIMATIC NET Tw isted-Pair and Fiber-Optic Networks
C79000-G8976-C125-02
6.2 Optical and Electrical Switch Modules (OSM/ESM)
Figure 6-6 Optical/Electrical Switch Modules (OSM/ESM)
6.2.1 Application
Overview
The OSM/ESM Optical/Electrical Switch Modules, version 2 allow the
cost-effective installation of switched networks operating at 100 Mbps.
By creating segments (dividing a network into subnets/segments) and
attaching these segments to an OSM/ESM it is possible to contain the load in
existing networks and to achieve an improvement in network performance.
The OSM/ESM allows you to create redundant Industrial Ethernet ring structures
using switching technology with fast medium redundancy (reconfiguration time
maximum 0.3 seconds).
To create an optical ring, OSMs with two FO ports are required.
To create an electrical ring, ports 7 and 8 of the ESM are interconnected using
Industrial T wisted Pair cables.
The data rate in the ring is 100 Mbps; a maximum of 50 OSMs/ESMs can be used.
In addition to the two ring ports, OSMs/ESMs have a further six ports (optionally
sub-D or RJ-45 ports), to which both DTEs and network segments can be
attached.
Several rings can be interconnected redundantly using the integrated standby
function.
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