ABB Industrial IT enabled REX 521 Technical Reference Manual, General page 55

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Technical Reference Manual, General
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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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Refer to Digitale Stationslettechnik - Ergänzende Empfelungen zur Anwendung in
Verteilnetzstationen by Vereinigung Deutscher Elektrizitätswerke.
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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.
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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.
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