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138
DNP 3.0 and MODBUS Data Structures
DNP
Modbus
Quantity
Full Scale
Type:Index
Input Reg.
AI:24
30025
A Active Power (W)
±
Pmax =
±
32767
AI:25
30026
A Reactive Power (VAR)
±
Pmax =
±
32767
AI:26
30027
A Apparent Power (VA)
Pmax = 32767
AI:27
30028
A Power Factor
±
1.0000 =
±
32767
AI:28
30029
A Q
±
Pmax =
±
32767
AI:29
30030
Reserved
0
AI:30
30031
C Active Power (W)
±
Pmax =
±
32767
AI:31
30032
C Reactive Power (VAR)
±
Pmax =
±
32767
AI:32
30033
C Apparent Power (VA)
Pmax = 32767
AI:33
30034
C Power Factor
±
1.0000 =
±
32767
AI:34
30035
C Q
±
Pmax =
±
32767
AI:35
30036
Reserved
0
AI:36
30037
B Active Power (W)
±
Pmax =
±
32767
AI:37
30038
B Reactive Power (VAR)
±
Pmax =
±
32767
AI:38
30039
B Apparent Power (VA)
Pmax = 32767
AI:39
30040
B Power Factor
±
1.0000 =
±
32767
AI:40
30041
B Q
±
Pmax =
±
32767
AI:41
30042
Reserved
0
AI:42
30043
Total Active Power (W)
±
Ptmax =
±
32767
AI:43
30044
Total Reactive Power (VAR)
±
Ptmax =
±
32767
AI:44
30045
Total Apparent Power (VA)
Ptmax = 32767
AI:45
30046
Total Power Factor
±
1.0000 =
±
32767
AI:46
30047
Total Q
±
Ptmax =
±
32767
AI:47
30048
Reserved
0
Table 13.2: Power Register Values
13.4
Power Data Structure
The 1133A determines power quantities based on the cross product of measured voltages and
currents. For additional details on this measurement, see Section 11.8, “Functional Description,
Power and Energy.”
DNP users should be able to download any of the Quantities listed in Table 13.2 by using the
Index value associated with it.
For example, call C-phase Active Power with index number 29, or C-phase power factor with
index number 11. The measurement resolution is determined by the maximum current divided by
32767.