DSSA165 ABB Main power supply 48990001-LY Power supply unit

DSSA165 ABB Main power supply 48990001-LY Power supply unit

DSSA165 ABB Main power supply 48990001-LY Power supply unit

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Topology

ARCNET is one of the few networks that can be operated in every conceivable

topology. Options include bus, star, or tree topologies, or mixtures of these. This

means that ARCNET can be used for a broad field of different applications.

Bus assignments

ARCNET operates on the token-passing procedure, where each subscriber has

equal rights.

Configuration mechanisms

ARCNET allows to add and to remove subscribers from the network during

runtime. When a new

subscriber is added, the entire network will be re-configured.

Security mechanisms

A 16-bit CRC is appended to every data packet, and checked by the recipient.

If the token is lost, a reconfiguration routine will be initiated, and the network will

automatically be restructured. Additionally, diagnostic registers are available.

Physical characteristics

ABB recommends coaxial cables as transmission medium, for direct connection

to the CPU. But also twisted-pair cables or (glass, plastic) fiber-optic cables can

be connected via bus converters. The line lengths that can be achieved without

any intermediate amplifiers depend not only on the used medium, but also on the

selected baud rate and the number of subscribers. The ranges per segment vary

from approximate ly 120 m for a simple two-wire bus, up to 3 km for fiber-optics,

in each case at 2.5 MBit/s. By providing appropriate hubs, different topologies

and transmis sion media can be combined with each other and the transmission

distance can be increased. The coaxial cables used are a type with 93 Ohm, e.g.

RG 62.