
TPU2000/2000R Modbus/Modbus Plus Automation Guide
83
13: 40013
Offset Bipolar (12) 40534 (32/Signed)
1000 (Power) Phase A VARs
14: 40014
Offset Bipolar (12) 40536 (32/Signed)
1000 (Power) Phase B VARs
15: 40015
Offset Bipolar (12) 40538 (32/Signed)
1000 (Power) Phase C VARs
16: 40016
Unipolar (16)
40158 (16/Unsigned)
1 (Normal)
Phase CT Ratio
17: 40017
Unipolar (16)
40159 (16/Unsigned)
1 (Normal)
PT Ratio
18: 40018
Offset Bipolar (12) 40399 (16/Unsigned)
10 (Current)
Load Current N
19: 40019
Unipolar (16)
40556 (32/Signed)
10000
(Normal)
Pos 3 Phase
kWatthours (High)
20: 40020
Unipolar (16)
40556 (32/Signed)
10000
(Remainder)
Pos 3 Phase
kWatthours (Low)
21: 40021
Neg Unipolar (16)
40556 (32/Signed)
10000
(Normal)
Neg 3 Phase
kWatthours (High)
22: 40022
Neg Unipolar (16)
40556 (32/Signed)
10000
(Remainder)
Pos 3 Phase
kWatthours (Low)
23: 40023
Unipolar (16)
40558 (32/Signed)
10000
(Normal)
Pos 3 Phase
kVARhours (High)
24: 40024
Unipolar (16)
40558 (32/Signed)
10000
(Remainder)
Pos 3 Phase
kVARhours (Low)
25: 40025
Neg Unipolar (16)
40558 (32/Signed)
10000
(Normal)
Neg 3 Phase
kVARhours (High)
26: 40026
Neg Unipolar (16)
40558 (32/Signed)
10000
(Remainder)
Neg 3 Phase
kVARhours (Low)
27: 40027
Unipolar (16)
40562 (16/Unsigned)
1 (Normal)
System Frequency
28: 40028
No Default
No Default
No Default
Spare
29: 40029
No Default
No Default
No Default
Spare
30: 40030
No Default
No Default
No Default
Spare
31: 40031
No Default
No Default
No Default
Spare
32: 40032
No Default
No Default
No Default
Spare
An explanation of some of the above default mappings are offered as a guide to understanding the scaling
methodology implementation. Figure 5-31 illustrates the scaling procedure for remapped registers 40001 through
40032 Registers 257, 259, and 261 (as detailed in Table 5-11 above) contain the MMI reported current values to
be remapped and re-scaled to 12 bit Offset Bipolar Values.
E
C
NORMAL
FAIL
PICKU P
REC LOSER OUT
SYSTEM RESET
TIME
INSTANTANEOUS
FREQUENC Y
NEGATIVE SEQUENCE
TARGET RESET
STATUS
TARGETS
A
B
C
N
DPU
2000R
Net work
Partner
V1.0
TPU2000R
32
Mappable
Registers
400001
400002
400003
400004
400005
400032
Ia Current Mag.
Ib Current Mag.
Ic Current Mag.
OFFSET BIPOLAR
12 bit resolution
0 = (-) Full Scale
(12 bits -1)
2 - 1 = 2047 = 0
(12 bits)
2 - 1 = 4095 = (+) Full Scale
REFERENCE TABLE 2
(+) Full Scale = Scale * CT
phase
= 10* 100 = 1000
(-) Full Scale = - Scale * CT
Phase
= - 10 * 100 =
- 1000
0 Amperes
RTU or Host Reads 0
RTU or Host Reads 2047
RTU or Host Reads 4095
DPU 2000(R) Register Contents
in Register 40002, 40003, or 40004
DPU 2000(R) MMI Display
or Register Contents of 40257, et al
Figure 5-31. Register Scaling Default Example
The mathematics to determine the reported value to the host is illustrated in Figure 5-31 and using Equation 5
above.