ABB REX 521, Technical Reference Manual, General

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1MRS 751108-MUM Protection Relay
Technical Reference Manual, General
REX 521
11. Appendix A: The IEC 60870-5-103 bus
11.1. Functions supported by the REX 521
11.2. 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
Function
code
Comment
Reset CU 0 Replies with the identification string
User data 3 • GI command
• time synchronization (unicast)
• application control commands
Broadcast 4 Time synchronization only
Reset FCB 7 Replies with identification string
Request Access Demand 8
Request Status of Link 9
Request Class 1 Data 10
Request Class 2 Data 11