ABB Relion 670 series, Руководство по протоколу связи

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3.7 Analog inputs
GUID-7CD0F06F-7599-44C8-A236-7BB024EC11B8 v2
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
GUID-21EFDFEB-EF2B-462A-8144-38207469785B v6
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)
(destMaxVal-destMinV Val)
+destMinVal
(sourceMaxVal - sourceMinVal)






GUID-9F985816-2268-412A-AE24-ED90EAC44AD7 V2 EN-US
(Equation 1)
In multiplicative scaling, argument four destMaxVal becomes a scale constant.
DNPvalue sourceValue destMaxVal
= ×
GUID-6AE38BAE-8FD6-44DD-9D53-45BE7AB121FF V1 EN-US
(Equation 2)
In divisor scaling, argument four destMaxVal becomes a scale constant.
DNPvalue
sourceValue
destMaxVal
=
GUID-35F9E774-67FF-4257-8BA1-6D2E2CB4EC57 V1 EN-US
(Equation 3)
1MRK 511 391-UUS C
Section 3
Vendor-specific implementation
670 series 2.2 ANSI 19
Communication protocol manual