Abb Data Type Definitions; Figure 5-25. Register Scaling Methodology; Figure 5-26. Change Configuration Settings Menu Illustrating Ct And Vt Configuration - ABB TPU2000 Technical Manual

dependent upon the TPU2000/2000R and the ratio of the PT and CT's used. The CT and PT values are entered
into the TPU through ECP/WinECP in the Configuration Settings Menu illustrated in Figure
we know it, is not perfect. Many SCADA hosts are unable to interpret the 32-bit value received over a network.
What can be done? ABB's answer is to provide for a fill-in-the-blanks method of scaling. This method takes the
interpreted value and provides for DIVISOR SCALING (taking the MMI/network register values and dividing by a
constant) or a RATIO SCALING (taking the MMI values/network register values, PT Ratios, CT Ratios and Full
SCALE Metered Readings) and transform it into a raw scaled value depending on the minimum/maximum value
the SCADA system can interpret. The SCADA system must then receive the mathematical value and perform its
own internal calculations so that the data may be displayed to the operator which mirrors that displayed on the
relay's front panel.

Figure 5-26. Change Configuration Settings Menu Illustrating CT and VT Configuration

ABB Data Type Definitions

All definitions within this manual shall be based upon bits or registers. The ABB concept of Register Scaling and
Remapping is based upon the Modbus address map contained within this protocol document, it is essential to
understand Modbus Protocol even when providing Register Scaling and Remapping for DNP, Modbus Plus or
Standard Ten Byte Protocols.
For example, Modbus requires all register values to be reported in 16 bit portions (1 word). Two registers may be
combined to form numeric representations for IEEE notations, long signed (a number from –2,147,483,648 to
+2,147,483,647) or unsigned numbers( a number from 0 to +4,294,967,295). If a value is requested in the short
form ( a number from –128 to +127, or 0 to 255), 16 bits will be returned as a response to the host's request, but
the number will be within the range of an 8 bit integer.
TPU2000/2000R Modbus/Modbus Plus Automation Guide
TYPICAL SCALING EXAMPLE
Change Register Configuration
32
Netwo rk
Mappable
DPU Partn er
ST ATUS TA RGETS V1.0
2000R
N OR MAL A TIME
FA IL B INST AN TA NE OU S
P ICK UP FR EQU EN CY C
C Registers
R EC LOSE R OU T NEG ATIVE S EQUE NC E
N
SYS TE M RE S ET TAR GE T RE SET
E
TPU2000R
High Word Van
40265
40266 Low Word Van

Figure 5-25. Register Scaling Methodology

400001 User Definable Register 40005
400002
Scale
400003
Source Register Address (4XXX)
400004 Destination Data Type Bipolar (LSB)
Destination Data Size
400005
Source Scale Type Voltage
Source Data Type Unsigned 32 Bit
To Accept Changes: Press Enter Return
400032
No Change: Press Escape Key
5-14. However, life as
500
265
12 Bit
75