•
All data objects or their data attributes can be selected for a data set.
•
Only those data attributes of a data object can/will be selected which have the same
function constraint (FC).
•
Data objects with different FC can be selected for a data set. For example, DOs with
FC = ST and DOs with FC=MX can be member in one data set.
•
A single data attribute can be selected when it is specified with a trigger option. For
example, the data attribute stVal of the data object Pos can be selected as a member
of a data set, because it is specified with the trigger option data change detected
(dchg).
The description of the data sets with name and the list of data object members (FCDAs is
included in the SCL file in the IED section in the Logical device subsection. As specified
in IEC 61850–7–2 clause 9, the data sets are part of a logical node. They are most likely
included in the LLN0.
6.2
Report control block (URCB/BRCB)
To be able to transmit the signals configured in a DataSet, a report control block must be
configured to handle and specify how the events are transmitted to the clients. There are
two types of report control blocks; unbuffered and buffered. The buffered report control
block stores the events during a communication interrupt, while the unbuffered is sent
upon data change and not stored during interruption.
The content of a BRCB is listed in IEC 61850-7-2 in clause 14. The BRCB contains many
attributes which are of interest to handle and secure the communication between the client
and the server and may be set once as default in a project. Others are of application interest
in the way events are handled in a project.
•
Buffer time (valid only for BRCB)
•
This parameter describes how long the report should wait for other expected
events before it sends the report to the client. When it is known, that additional
events are generated as a follow up, it is useful to wait, for example, 500 ms for
additional events stored in the report. This feature reduces the number of
telegrams transmitted in case of a burst of changes. But on the other side it
increases the overall transaction time for events from IED input to presentation
on HSI.
•
Trigger options
•
The data attributes know three different trigger options (dchg, qchg, dupd).
Within the BRCB, the two other can be defined (integrity and general
interrogation). The attribute Trigger option is a multiple choice and allows to
mask the supported trigger options in this BRCB.
•
Integrity period
Section 6
1MRK 511 281-UUS A
Data sets and control blocks
40
650 series ANSI
Communication protocol manual
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