Section 3
Interbay bus functions
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3.1
Introduction
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An interface is available for connecting the numerical busbar protection to a station
automation system or station monitoring system (SCS/SMS).
For an overview of REB500’s communication interfaces, see the
Operation manual.
In contrast to feeder control and protection bay units, REB500 is equipped with only a single
interbay bus interface via which all the REB500 bay units in the entire station communicate.
This has to be taken into account by the various bus protocols.
This document applies for IEC 60870-5-103. However,
document also contains information of a second IBB using IEC 61850-8-1 if
configured.
3.2
Basic configuration
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The fourth octet in the Data Unit Identification field of an ASDU determines the common
address of ASDU. It normally has to be the same as the station address on the link layer.
Exceptions are permitted where additional common ASDU addresses are needed because of
multiple instances of functions.
In case of REB500, this exception allowed in the IEC recommendation is used to be able to
address the Central Unit and the Bay Units via a single physical connection.
Common Address of ASDU – CAA
Basic setting:
0
Central Unit
1-60
Bay Units
255
Global address
The dialog for configuring the communication is accessed by selecting HMI500
Configuration/Communication/SCS Configuration.
1MRK 511 451-UEN Rev. C
Section 3
Interbay bus functions
Distributed busbar protection REB500
7
Communication protocol manual IEC 60870-5-103
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