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1MRK 511 393-UEN A
6.2
670 series 2.2 IEC
Communication protocol manual
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 used as a background cycle to ensure that the process image in all
partners is the same.
•
General interrogation
•
A general interrogation is only done on request from a client. Not all
Data-sets may contain information which is needed for a general update
of the client. For example data with T(ransient) = TRUE are not part of a
GI. When the BRCB attribute general interrogation is set to TRUE a GI
request from the client will be handled. The report handler will transmit
all data defined in the Data-set with their actual values. The IEC 61850
standard defines that all buffered events shall be transmitted first before
Data sets and control blocks
Section 6
SEMOD129786-17 v4
39
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