ABB B4LE 1KHL015045P0001 source

Description

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 approximately 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 transmission 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.
The permissible twisted-pair cables are specified in
IEEE 802.3i-1990. At 2.5 MBit/s and with coaxial
cables, for example, the maximum length of a bus
segment is 300 m with eight subscribers and without
a hub. With twisted-pair cables, under the same
conditions, a maximum length of approximately
120 m can be achieved. The maximum transmission length depends on the number of connected
subscribers. With coaxial cables, a maximum of
16 km can be achieved; with twisted-pair cables
approximately 6 km, in each case at 2.5 MBit/s. The
fiber-optic link provides the highest degree of interference immunity. With glass fiber-optics, distances
of up to 3 km are possible at 2.5 MBit/s; with plastic
fiber-optic cables only small distances of up to approximately 100 m. The baud rate plays no significant role
in fiber-optic cable transmission. Here, the range can
as well be extended using hubs.

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