ABB Relion SAM600 Communication Protocol Manual page 33

1MRK 511 441-UEN Rev. C
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Trigger Options
IEC 61850 has defined in total five different TrgOp. Three of them belonging to data attributes and
marked per data attribute in the column TrgOp of the CDC tables in part 7–3. The other two
belonging to the configuration of control blocks.
• dchg = data-change
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• qchg = quality change
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• dupd = data value update
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• integrity
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• general interrogation
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Link BRCB to a client LN
The BRCB has to know to whom the events shall be transmitted. This is the signal routing
engineering step. The IEC standard 61850–6 describes that this is given by including the LN of the
client IED in the ReportBlockEnabled option.
The selected client IED with the corresponding LN, for example, ITCI is included in the SCL structure
of the Report Control description of the IED section.
The description of the BRCB with selected DataSet, configured parameters and selected IEDs is
included in the SCL file in the IED section in the LN0 structure for the LD where this LN0 belongs to.
Switchgear control unit SAM600-IO
Communication protocol manual
This BRCB attribute can be used by a client to clean the event buffer from old events. The
events are discarded on request of the client. This feature can be used to delete old
events not transmitted to the client due to stopped communication. After the link is
reestablished the client can decide to clean the buffer or to receive the history.
Whenever a process value has changed its value either binary or a measurement a
transmission is done.
Looking to the possibilities of the quality data attribute type (q) any changes in the quality
description will be transmitted.
This trigger option give the possibility to define that a transmission should be done on a
condition which can be controlled by the application.
This trigger forces the transmission of all process values defined in the data set when a
timer value (the integrity period) expires.
This trigger is forced by the clients (= station level IED; NCC gateway, station HMI, ...).
Normally a GI is asked for, when the client and the server start or restart a session. When
the client is able to receive the actual values and when the logical device has scanned all
process values at least once, an image of the actual process signal status can be
transmitted to the client.
Note that the possible trigger options for each attribute are included and
defined in the datatype template section in SCL.
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Section 6
Data sets and control blocks
27