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Section 3
Vendor-specific implementation
3.7
3.7.1
20
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.
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.
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.
The ratio, multiplicative and divisor scaling methods use the first two arguments,
souceMinVal and sourceMaxVal, to define the source value range inside which the
object is to be used. The complete value range of the object is usually wanted even
though the user could freely define the source range.
Arguments three and four, destMinVal and destMaxVal, define the destination value
range. In ratio scaling, arguments destMinVal and destMaxVal define the corresponding
range of the scaled, reported DNP3 value.
DNPvalue=
(sourceValue - sourceMinVal)
GUID-9F985816-2268-412A-AE24-ED90EAC44AD7 V2 EN-US
(destMaxVal-destMinV V al)
(sourceMaxVal - sourceMinVal)
1MRK 511 391-UUS A
GUID-7CD0F06F-7599-44C8-A236-7BB024EC11B8 v2
GUID-21EFDFEB-EF2B-462A-8144-38207469785B v6
+destMinVal
(Equation 1)
670 series 2.2 ANSI
Communication protocol manual
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