Appendix A: The Iec 60870-5-103 Bus; Functions Supported By The Rex 521; The General Principle Of Application Data Mapping - ABB REX 521 Technical Reference Manual, General

REX 521
11.
11.1.
11.2.
48
Protection Relay
Technical Reference Manual, General

Appendix A: The IEC 60870-5-103 bus

Functions supported by the REX 521

Function
Reset CU
User data
Broadcast
Reset FCB
Request Access Demand
Request Status of Link
Request Class 1 Data
Request Class 2 Data

The general principle of application data mapping

The interface between the REX 521 physical applications and the IEC 60870-5-103
application layer is done accordingly:
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If a corresponding REX 521 application signal is defined by the IEC 60870-5-103
standard, the alternative A is used.
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Private definitions are basically used because of two reasons:
1. The standard does not define the signal.
2. The signal is defined by the standard but the REX 521 application signal
interface differs from this model.
Class 1 data buffering and priorities
The internal IEC 60870-5-103/Class 1 buffer inside the REX 521 unit can store up
to 50 spontaneous events. The interrogation events and the possible response
messages, that also are part of the class 1 data, do not occupy space in the buffer.
The priority of the different categories of the pending class 1 data is always so that
the response messages have the highest priority, thereafter the spontaneous events
and finally the interrogation events. The IEC_103 data cannot be filtered by using
event masks.
Function
Comment
code
0 Replies with the identification string
3 • GI command
• time synchronization (unicast)
• application control commands
4 Time synchronization only
7 Replies with identification string
8
9
10
11
1MRS 751108-MUM