Time Synchronization; Analog Inputs; Analog Data Scaling - Hitachi Relion 670 Series Communication Protocol Manual

1MRK511391-UUS Rev. L
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.
3.6

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.
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.
3.7

Analog inputs

It is important to note that 16-bit and 32-bit variations of analog inputs are transmitted through DNP3 as
signed numbers. The default analog input event buffer size is set 1000.
3.7.1

Analog data scaling

The four scaling options associated with analog input data reporting are None, Ratio, Multiplicative and
Divisor.
Ratio, multiplicative and divisor scaling methods
The PCM600 tool contains four value arguments related to the scaling methods: sourceMinVal,
sourceMaxVal, destMinVal and destMaxVal. The use of these arguments differs depending on the
scaling method.
DNP, 670 series
Communication protocol manual
Parameters have to be set among the system wide time parameters as well as among the
individual DNP3 masters.
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Section 3
Vendor-specific implementation
GUID-A64325B9-381F-48A3-8130-8A17EE0C1C80 v4
GUID-7CD0F06F-7599-44C8-A236-7BB024EC11B8 v2
GUID-21EFDFEB-EF2B-462A-8144-38207469785B v6
17