33
*
For connections directly from the substation and installation in the switch
gear, ABB recommends Westermo ED-20. It is an industrialized DIN Rail
mounted serial to Ethernet router. The device will allow access to a remote
Ethernet network via a PSTN, ISDN or radio modem.
*
For connections to corporate intranet and/or installation in control room
(or not harsh industrial environment), ABB recommends any off-the-shelf
standard Ethernet router integrated in PC (software router) or hardware
device may be used (for example CISCO). The rack version for
modularity and performance reasons it is suggested rather than the
software version running on PC.
6.3.
Network topology
6.3.1.
Bus topology
A typical bus topology is illustrated in Fig. 6.3.1.-1
A051109
Fig. 6.3.1.-1
Bus topology
Each switch is connected to the previous switch or next switch in the cascade
via one of its ports (uplink port).
The bus topology is recommended for small plants for its cost effective
advantage. The main disadvantage is to have a big latency to reach the last
device of the bus from the PC.
6.3.2.
Star topology
A typical star topology is illustrated in Fig. 6.3.2.-1.
1MRS755865
Multifunctional Protection and Switchbay
Control Unit
Installation Manual for Web Interface
Installation manual
REF 542plus
