Time Synchronization - ABB RELION 650 Series Communication Protocol Manual

Section 3
Vendor-specific implementation
3.6
20
command operation for the corresponding control relay output block (CROB) point.
BOS points are not recommended to be included in class 0 polls.
As an alternative, it is recommended that actual status values affected by CROB points
should be mapped as BI or DI. Requesting CROBs on the Open and Close points of
SCSWI operate the breaker. The operation may take several seconds to complete. This
means that a success response from the operate command may have been returned
from the CROB even though the operation is still in progress. Therefore, the mentioned
outputs from, for example, SCSWI need to be monitored as a complement.
This implies that the binary output object should not be assigned to classes 1, 2 or 3. A
read of the binary outputs returns the last value written to that output.

Time synchronization

DNP3 supports time synchronization of the IED via object numbers 50...52. Time
synchronization via DNP3 should only be used if time source with better accuracy is
not available, for example, IRIG-B, GPS or SNTP. For TCP/IP channels, the LAN
procedure should be used, in which two separate messages are transmitted from the
master, record current time and write, see DNP3 Specification Volume 5 for more
information.
Parameters have to be set among the system wide time parameters as
well as among the individual DNP3 masters.
DNP3 can be set for a coarse synchronization source under Configuration/Time/
Synchronisation/TIMESYNCHGEN:1/CoarseSyncSrc in the LHMI tree. Note that
when DNP3 is set as coarse synchronization source, no fine synchronization source
shall be configured. Otherwise, the time will jump between the fine and the coarse
synchronization time sources.
Each DNP3 master configuration block has a number of parameters that affect the time
synchronization. Only one master at a time is configured to set the time in the IED.
Therefore, only one master configuration block enables the DNPToSetTime and
TSyncReqAfTout parameter. That is, both parameters must have the same value and
should only be set for one master at a time.
The tSyncTimeout parameter defines how long after a successful time synchronization
the NeedTime IIN bit has to be set. The tSyncReqAfTout parameter defines if the
tSyncTimeout should be used or not. Also, the IED supports both the new standard
directive of use of UTC and local time for backward compatibility (ExtTimeFormat). If
UTC is selected, the time in the time synchronization messages is expected to be in
UTC, and vice versa.
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650 series 2.2 ANSI
Communication protocol manual