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Industrial Ethernet Networks

2-10

SIMATIC NET Twisted-Pair and Fiber-Optic Networks

C79000-G8976-C125-02

2.5 Example of an Industrial Ethernet Network

Figure 2-2 shows an example of the combination of different technologies and

generations of Industrial Ethernet products in one network.

Network 1

In the high-speed network 1, four OSMs form a redundant ring with 100 Mbps

transmission capacity. If the connected DTEs or network components are suitably

designed, the twisted-pair ports of the OSMs can also be operated at 100 Mbps.

Since OSMs operate as switches, only the maximum lengths of the individual port

connections need to be taken into account during configuration (100 m twisted pair,

3000 m fiber optic).

Network 2

Network 2 also forms a redundant ring. The OLM and star coupler ASGE network

components operate at 10 Mbps using the CSMA/CD medium access method. The

maximum lengths of the individual port connections are limited to 100 m for twisted

pair and 3100 m for fiber-optic between two OLMs. The limits of the collision

domains (max. possible signal propagation time between two nodes) must also be

kept to.

Network 3

Network 3 represents a small system that has existed for years and that is based

on triaxial cable. A SIMATIC NET ELM allows the system to be connected to a

modern large network with switching technology.

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