Section 2
1MRK 511 371-UEN
Interbay bus functions
4
Communication Protocol Manual, IEC 60870-5-103
Distributed busbar protection REB500
Section 2
Interbay bus functions
2.1
Introduction
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 confer to 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 Section 2 of
this document also contains information of a second IBB using if
IEC 61850-8-1 configured.
2.2
Basic configuration
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 the case of REB500, this exception allowed in the IEC recommendation is used
in order 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
