Beckhoff C1220 Manuel d'utilisateur télécharger pdf (Page 3)

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3 Beckhoff Lightbus System Description

Beckhoff Lightbus - PC interface card C1220

Beckhoff Lightbus System Description

The Beckhoff Lightbus consists of an intelligent central module and a field

bus based on fibre-optic conductor.

Beckhoff Lightbus

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The Beckhoff Lightbus is coupled to the host System via a DPRAM, thus

guaranteeing fast and convenient communication.

Bus couplers for Beckhoff Bus terminals and diverse I/O modules are

available for processing the process image. Modules and bus couplers are

linked to one another in a ring structure. Thanks to the use of fibre-optic

conductor, interference sensitivity is low and the data transfer rate of 2.5

Mbaud is high. Errors occurring in the fibre-optic ring are detected by the

central module and are reported to the host system. Implemented ring

diagnostics functions enable swift error detection and remedying.

A communication protocol optimized for speed and simplicity has been

defined for data transfer between the central module and I/O modules.

Below, this communication protocol is also referred to as a telegram.

Communication on the fibre-optic ring is controlled by the central module. It

sends telegrams which pass through the individual modules and terminal

rows in the fibre-optic ring, and which are ultimately received again and

checked.

A telegram consists of the telegram frame and contents.

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Beckhoff C1220 Manuel d'utilisateur Page 3