Report Control Block (Urcb/Brcb) - ABB Relion Series 670 Manual

Section 6
Data sets and control blocks
6.2
42
• 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.

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.
• 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
• When integrity is selected in the trigger option attribute, it is needed to
define an integrity period to force the transmission of all data listed in the
DataSet. This is done by the attribute Integrity period. This feature can be
1MRK 511 349-UEN -
670 series 2.1 IEC
Communication protocol manual