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9 Modbus RTU – integrated Modbus port specification
9.3 Modbus register map
56
PXR Electronic trip unit
01/21 MN012005EN
www.eaton.com
The structure of the four-register format and the calculation of the energy
values are outlined below.
Energy register 0
Energy register 1
Energy register 2
Energy register 3
The energy value (four-register energy value) is calculated as follows:
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Byte 1 of the mantissa
Byte 0 of the mantissa
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Byte 3 of the mantissa
Byte 2 of the mantissa
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Byte 5 of the mantissa
Byte 4 of the mantissa
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
a = technical unit
b = mantissa factor
Energy = 2
a
x 48-bit energy value x 10
b