ABB A43 User Manual page 121

Communication with Modbus
Function
Data type
Scaler
The date and time on which the value was stored. How to interpret the data in
Timestamp
these registers is described in. "Date and time format" on page - 117
The OBIS code for a quantity in for example a load profile channel or previous
Quantity registers
values channel. A list of OBIS codes is found in "Quantity identifiers" on page
- 117.
The table below shows an example of how an OBIS code is mapped to
the Quantity registers. The OBIS code used is for active energy import
total: 1.0.1.8.0.255.
Byte
number
0
1
2
3
4
5
Data type register The data type register contains a data type identifier that is a value between 0 and 255.
Currently only two identifiers are used for historical values. The identifier for 64 bit
unsigned integer is 21 and the identifier for 64 bit signed integer is 20.
Scaler register The scaler register shows the resolution of the value. The measured value in the Value
register should be interpreted as value*10
is represented by scaler 3 while milli is -3. An energy accumulator with
the resolution 0,01 kWh consequently has scaler 1.
2CMC48001M0201
Revision: C
Size Description
1 Data type for the value of the quantity
concerned
1 Scaling of the value for the quantity concerned Signed
Comment on byte order
Most significant byte of lowest register
Least significant byte of lowest register
...
...
...
Least significant byte of highest register
121
Data type
Unsigned
Value (in case of active
energy import total)
1
0
1
8
0
255
scaler
. For example, the prefix kilo
Read
/write
R/W
R/W
A43/A44
User Manual