ABB COM600 series 5.0 Technical Reference Manual page 71

1MRS758690 COM600 series 5.0
Master Protocols (Ethernet) and Applications Technical Refer-
ence Manual
XSAT Read Request
Attribute Data Type Unknown
The data type of the attribute is not known, because it is not included in the IEC 61850
OPC Server configuration (SCL). The Transparent XSAT attribute asks first the required
data type, before reading the data from an IEC 61850 server.
If the Transparent XSAT attribute receives a success message, the data type is saved. If
the Transparent XSAT attribute receives an error message, an XSAT error string is sent
to the IEC 61850 OPC client.
The IEC 61850 OPC server request for the data type with a ReadVariableData service.
The results are written in the Transparent XSAT attribute as an XSAT string. The XSAT
string contains success and error messages.
Attribute Data Type Known
The attribute data type is known from a previous request or the attribute is included in
the IEC 61850 OPC Server configuration (SCL). The IEC 61850 OPC server directly
uses a ReadVariableData service to complete the request. The reply message is written
in the Transparent XSAT attribute as an XSAT string. The XSAT string contains success
and error messages.
XSAT Write Request
Attribute Data Type Unknown
The data type of the attribute is not known, because it is not included in the IEC 61850
OPC Server configuration (SCL). The Transparent XSAT attribute first asks the required
data type, before writing the data from an IEC 61850 server.
If the Transparent XSAT attribute receives a success message, the data type is saved. If
the Transparent XSAT attribute receives an error message, an XSAT error string is sent
to the IEC 61850 OPC client.
The IEC 61850 OPC server requests for the data type with a WriteVariableData service.
The results are written in the Transparent XSAT attribute as an XSAT string. The XSAT
string contains success and error messages.
Attribute Data Type Known
The attribute data type is known from a previous request or the attribute is included in
the IEC 61850 OPC Server configuration (SCL). The IEC 61850 OPC server directly
uses a WriteVariableData service to complete the request. The reply message is written
in the Transparent XSAT attribute as an XSAT string. The XSAT string contains success
and error messages.'
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