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Technical Reference Manual, General
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Adjustable IEC_103 serial communication parameters are shown in the table below.
1) Refer to Table 12.6.-3
2) 0 = Off; 1 = On
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The interface between the REF 54_ physical applications and the IEC 60870-5-103
application layer is done accordingly:
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If a corresponding REF 54_ application signal is defined by the IEC 60870-5-103
standard, the alternative A is used.
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Refer to Digitale Stationsleittechnik - 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 REF 54_ application signal
interface differs from this model.
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The internal IEC 60870-5-103/Class 1 buffer inside the REF 54_ 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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The REF 54_ applications, whose modularization is based on trip stages, have been
mapped into the IEC 60870-5-103 information numbers according to the following
model:
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Unit address
1...254
1
IEC_103 station address
Baud rate
9600, 19200
9600
Communication speed
Function type
0..255
160
Unit function type
Scale factor
1.2 or 2.4
1.2
Analogue value scale factor
Frame type
0..17
1)
1
Measurement frame type
RTD data frame
0 or 1
2)
0
If RTD data frame is on, then it is
send to every second class 2
data poll. Store and reset is
needed.
