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Local Area Networks

Local Area Network (LAN) In any complex power monitoring system the need for rapid

information flow is critical. Conditions at any point in the system

may impact the entire power distribution system. This need for

information flow often requires that intelligent devices, such as

supervisory PCs, be interconnected by a local area network

(LAN). A LAN is a communication system designed for private

use in a limited area.

A node is an active device, such as a computer or printer,

connected to the network. A LAN can be arranged with nodes

in a bus, star, or a combination of bus and star.

One example of a widely used LAN is Ethernet. Ethernet uses a

bus topology and an access control system that allows devices

to initiate communication only if a carrier signal is not present.

By comparison, Token Ring networks use a ring topology and a

signal called a token to determine which device can

communicate.

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Siemens DTU3005-B Especificaciones Pagina 44