B+G e-tech and Eastron - SDM72CT-M User Manual
B+G e-tech GmbH ° Fr.-Mehring Str. 36 ° DE 01979 Lauchhammer
T: +49 3574 467550 F: +49 3574 4675519 M: [email protected] W: www.eastron-germany.de
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Input Registers
PART 3
Modbus Protocol
Input registers are used to indicate the present values of the measured and calculated electrical quantities. Each
parameter is held in two consecutive 16 big register. The following table details the 3X register address, and the
values of the the address bytes within the message. A (*) in the column indicated the parameter is valid for the
particular wiring system, Any parameter with a cross (X) will return the value zero. Each parameter is held in the 3X
registers. Modbus Protocol function code
04
is used to access all parameters.
For example, to request: Amps 1 Start address = 0006
No.of registers = 0002
Amps 2 Start address = 0008
No. Of register = 0002
Each request for data must be restricted to 30 parameters or less. Exceeding the 30 parameter limit will cause a
Modbus Protocol exception code to be returned.
Address
(Register)
Input Register Parameter
Modbus
Protocol Start
Address Hex
3
Ø
3
Ø
1
Ø
Description
Length
(bytes)
Data
Format
Units
Hi
Byte
Lo
Byte
4
W
3
W
2
W
30013
Phase 1 active power.
4
Float
W
00
0C
√
X
√
30015
Phase 2 active power.
4
Float
W
00
0E
√
X
X
30017
Phase 3 active power.
4
Float
W
00
10
√
X
X
30053
Total system power.
4
Float
W
00
34
√
√
√
30073
Import Wh since last reset .
4
Float
kWh
00
48
√
√
√
30075
Export Wh since last reset .
4
Float
kWH
00
4A
√
√
√
30343
Total kwh (3)
4
Float
kWh
01
56
√
√
√
Notes:
1. The power factor has its sign adjusted to indicate the direction of the current. Positive refers to forward current,
negative refers to reverse current.
2. The power sum demand calculation is for import
–
export.
3. Total kWh / kVarh equals to export.
