Beckhoff C1300 User Manual download pdf (Page 6)

C1300 VME to II/O Interface Unit Beckhoff II/O-System

Page 6 of 44 Version : 2.01 Date : 18.12.95

The connection of the II/O system to the host system is established by a DPRAM. This is

providing fast and comfortable communications.

The processing of the diverse signal states is supported by several II/O peripheral modules,

which are linked in a ring structure.The use of fiber optics minimizes the sensitivity for

interferences and allows a high transmission rate of 2.5 MBd. Errors, occuring in the FO--

ring, will be detected and reported to the host system by the central module. Functions

implemented for ring diagnosis, enable quick detection and correction of errors.

There is a speed and simplicity optimized communications protocol which, in the further

course of this documentation, will be called a telegram.

Communications on the FO-ring are controlled by the central module. This module will send

telgrams, that pass each of the modules in the FO-ring and are eventually received and

checked.

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Beckhoff C1300 User Manual Page 6