Modbus Protocol; Input Registers - Eastron SDM72CT-M User Manual

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PART 3

Modbus Protocol

Input Registers

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
For example, to request:
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)
Description
30013 Phase 1 active power.
30015 Phase 2 active power.
30017 Phase 3 active power.
30053 Total system power.
30073 Import Wh since last reset .
30075 Export Wh since last reset .
30343 Total kwh (3)
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 Import + export.
T: +49 3574 467550 F: +49 3574 4675519 M: info@bg-etech.de
04 is used to access all parameters.
Amps 1 Start address = 0006
No.of registers = 0002
Amps 2 Start address = 0008
No. Of register = 0002
Input Register Parameter
Length
(bytes)
4
4
4
4
4
4
4
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Protocol Start
Address Hex
Data Hi
Units
Format Byte
Float W 00
Float W 00
Float W 00
Float W 00
Float kWh 00
Float kWH 00
Float kWh 01
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Modbus
3 3
Ø Ø
Lo 4 3
Byte W W
0C √ X
0E √ X
10 √ X
34 √ √
48 √ √
4A √ √
56 √ √
1
Ø
2
W
√
X
X
√
√
√
√
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