TPU2000/2000R Modbus/Modbus Plus/ Modbus TCP/IP Automation Guide
82
IF NORMAL SCALING IS SELECTED
EQUATION 8:
Register Value = Source Value / Scale
IF REMAINDER SCALING IS SELECTED
EQUATION 9:
Register Value = Remainder of [Source Value/Scale] (commonly referred to as the modulus
function).
IF BIPOLAR CURRENT IS SELECTED
EQUATION 10:
Register Value = (2
N-1
*
Source Value / [FS
*
CT Ratio])
IF BIPOLAR VOLTAGE IS SELECTED
EQUATION 11:
Register Value = (2
N-1
*
Source Value / [FS
*
PT Ratio])
IF BIPOLAR POWER IS SELECTED
EQUATION 12:
Register Value = (2
N-1
*
Source Value / [FS
*
CT Ratio
*
PT Ratio])
IF UNIPOLAR OR NEGATIVE UNIPOLAR EQUATIONS ARE USED, Then the BIPOLAR equations above are
applicable with the note that,
FOR UNIPOLAR, if the result of the equation (10,11,or 12) is positive, then the register is filled with the value
calculated, else the reported value is 0
FOR NEGATIVE UNIPOLAR, If the result of the equation (10,11, or 12) is negative, then the register is filled with
the absolute value of the equation. If the calculated value is positive in sign, then the reported value is 0.
One should notice that if equations 5, 6, 7, 10, 11,or 12 are used, the SCALE entry shown in Figure 5-12?, refers
to the full scale value referenced in the equations. If equations 8 or 9 are used, the SCALE entry shown in Figure
8-2 refers to the Scale divisor denominator as referenced.
TPU2000 and 2000R User Definable Register Defaults
The TPU2000 and 2000R contains User Definable Register default mappings as shown in Table 5-11 below. It
should be noted that the register shall saturate at the maximum values computed and shown in Table 5-10 above.
The maximum saturation value can be computed to be 2N-1 where N is the register size in bits.
Table 5-11. Default Scaling and Remapping Register Assignments
User Definable
Register
Register Type
(Bits)
Start Register
(Bits/Type)
FS or
Scale(Type)
Description
1: 40001 Unipolar (16) 40129 (16/Unsigned) 1(Normal) Relay Status
2: 40002 Offset Bipolar (12) 40393 (16/Unsigned) 10 (Current) Load Current A(Wdg 2)
3: 40003 Offset Bipolar (12) 40395 (16/Unsigned) 10 (Current) Load Current B(Wdg 2)
4: 40004 Offset Bipolar (12) 40397 (16/Unsigned) 10 (Current) Load Current C(Wdg 2)
5: 40005 Offset Bipolar (12) 40513 (32/Unsigned) 150 (Voltage) Voltage VAN
6: 40006 Offset Bipolar (12) 40515 (32/Unsigned) 150 (Voltage) Voltage VBN
7: 40007 Offset Bipolar (12) 40517 (32/Unsigned) 150 (Voltage) Voltage VCN
8: 40008 Offset Bipolar (12) 40552 (32/Signed) 3000 (Power) 3 Phase Watts
9: 40009 Offset Bipolar (12) 40554 (32/Signed) 3000 (Power) 3 Phase VARs
10: 10010 Offset Bipolar (12) 40528 (32/Signed) 1000 (Power) Phase A Watts
11: 40011 Offset Bipolar (12) 40530 (32/Signed) 1000 (Power) Phase B Watts
12: 40012 Offset Bipolar (12) 40532 (32/Signed) 1000 (Power) Phase C Watts
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