Modbus - KWh meter - Eastron SDM120

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Info (ENG)

SDM120-Modbus, Single-Phase Multifunction DIN rail Meter

Measures kWh, Kvarh, KW, Kvar, KVA, PF, Hz, dmd, V, A, etc.
Bi-directional measurement IMP & EXP
Two pulse outputs
RS485 Modbus
Din rail mounting 17.5mm
45A direct connection
Better than Class 1 accuracy

The energy-meters “with a blue back-lighted LCD screen for prefect reading” are used to measure single-phase like residential, utility and Industrial application. The unit measures and displays various important electrical parameters, and provide a RS485 communication port for remote reading and monitoring. Bi-directional energy measurement makes the unit a good choice for solar PV energy metering. The compact design and din rail installation provides a easy and economical solution for your metering demand

Performance criteria:
Operating humidity ≤ 85%
Storage humidity ≤ 95%
Operating temperature -20°C – +50°C
Storage temperature -30°C – +70°C
International standard IEC 62053-21
Accuracy class 1
Protection against penetration
of dust and water IP51
Insulating encased meter of
Protective class Ⅱ

Specifications:
Meter type SDM120A (Mechanical register display)
SDM120D (LCD display)
SDM120DB (LCD with backlit)
Nominal voltage (Un) 230V AC
Operational voltage 161 – 300V AC
Insulation capabilities:
– AC voltage withstand 2KV for 1 minute
– Impulse voltage withstand 6KV – 1.2µS waveform
Basic current (Ib) 5A
Maximum rated current (Imax) 45A
Operational current range 0.4% Ib- Imax
Over current withstand 30Imax for 0.01s
Operational frequency range 50Hz ±10%
Internal power consumption ≤2W / 10VA
Test output flash rate (RED LED) 1000imp/kWh (2000imp/kWh optional)
Pulse output rate (pins 6 & 7) 1000imp/kWh (2000imp/kWh optional)
Consumption indicator (RED LED) Flashing at load running

Ps. De vraag of deze meters hun meterstanden onthouden na stroomuitval: Ja, getest bij de modbus RS485 versie.

Schema’s

Foto’s

Mobus registers

Function code 04 to read input parameters:

Address Register	Input Register Parameter	Modbus Protocol Start Address Hex
Parameter	Units	Format	Hi byte	Lo byte
30001	Voltage	Volts	Float	00	00
30007	Current	Amps	Float	00	06
30013	Active power	Watts	Float	00	0C
30019	Apparent power	VA	Float	00	12
30025	Reactive power	VAr	Float	00	18
30031	Power factor	None	Float	00	1E
30071	Frequency	Hz	Float	00	46
30073	Import active energy	kWh	Float	00	48
30075	Export active energy	kWh	Float	00	4A
30077	Import reactive energy	kvarh	Float	00	4C
30079	Export reactive energy	kvarh	Float	00	4E
30343	Total active energy	kWh	Float	01	56
30345	Total reactive energy	Kvarh	Float	01	58

Function code 10 to set holding parameter ，function code 03 to read holding parameter

Address Register	Holding Register Parameter	Modbus Protocol Start Address Hex	Description
Parameters	Format	Hi byte	Lo byte
40013	Relay Pulse Width	Float	00	0C	Write relay on period in milliseconds: 60, 100 or 200, default 100ms.
40019	Network Parity Stop	Float	00	12	Write the network port parity/stop bits for MODBUS Protocol, where: 0 = One stop bit and no parity, default. 1 = One stop bit and even parity. 2 = One stop bit and odd parity.3 = Two stop bits and no parity.Requires a restart to become effective.
40021	Meter ID	Float	00	14	Ranges from 1 to 247, .Default ID is 1.
40029	Baud rate	Float	00	1C	0:2400bps(default) 1:4800bps 2:9600bps 5:1200bps
40087	Pulse 1 output mode	Hex	00	56	0001: Import active energy, 0002: Import + export active energy, 0004: Export active energy, (default). 0005: Import reactive energy, 0006: Import + export reactive energy, 0008: Export reactive energy,
463745	Time of scroll display	BCD	F9	00	0-30s Default 0:does not display in turns
463761	Pulse 1 output	Hex	F9	10	0000:0.001kWh/imp(default) 0001:0.01kWh/imp 0002:0.1kWh/imp 0003:1kWh/imp
463777	Measurement mode	Hex	F9	20	Data Format：Hex 0001:mode 1(total = import) 0002:mode 2 (total = import + export）(default) 0003:mode 3 (total = import – export)

Voorbeeld uitlezen

Fabriek gegevens
Standaard adres: 1
Baud rate: 2400

#!/usr/bin/env python
 
# Modbus uitlezen
# Apparaat: EASTRON SDM120 (KWh meter)
#
# Script gemaakt door S. Ebeltjes (domoticx.nl)
 
from __future__ import division
import pymodbus
import serial
from pymodbus.pdu import ModbusRequest
from pymodbus.client.sync import ModbusSerialClient as ModbusClient #initialize a serial RTU client instance
from pymodbus.transaction import ModbusRtuFramer
 
from pymodbus.constants import Endian              # Nodig voor 32-bit float getallen (2 registers / 4 bytes)
from pymodbus.payload import BinaryPayloadDecoder  # Nodig voor 32-bit float getallen (2 registers / 4 bytes)
from pymodbus.payload import BinaryPayloadBuilder  # Nodig om 32-bit floats te schrijven naar register
 
method = "rtu"
port = "/dev/ttyUSB0"
baudrate = 2400
stopbits = 1
bytesize = 8
parity = "N"
timeout = 1
retries = 2
 
try:
  client = ModbusClient(method = method, port = port, stopbits = stopbits, bytesize = bytesize, parity = parity, baudrate = baudrate, timeout = timeout, retries = retries)
  connection = client.connect()
except:
  print "Modbus connectie error / EASTRON SDM120"

def kwh(appid):
  try:
    data = client.read_input_registers(342, 2, unit=appid)
    decoder = BinaryPayloadDecoder.fromRegisters(data.registers, endian=Endian.Big) # endian=Endian.Little / endian=Endian.Big
    eastron_sdm120_kwh = round(decoder.decode_32bit_float(), 3)
    client.close()
    return eastron_sdm120_kwh
  except:
    print "Modbus register error (kwh)"
    return 0

print kwh(1)

#!/usr/bin/env python

# Modbus uitlezen

# Apparaat: EASTRON SDM120 (KWh meter)

# Script gemaakt door S. Ebeltjes (domoticx.nl)

from __future__ import division

import pymodbus

import serial

from pymodbus.pdu import ModbusRequest

from pymodbus.client.sync import ModbusSerialClient as ModbusClient #initialize a serial RTU client instance

from pymodbus.transaction import ModbusRtuFramer

from pymodbus.constants import Endian # Nodig voor 32-bit float getallen (2 registers / 4 bytes)

from pymodbus.payload import BinaryPayloadDecoder # Nodig voor 32-bit float getallen (2 registers / 4 bytes)

from pymodbus.payload import BinaryPayloadBuilder # Nodig om 32-bit floats te schrijven naar register

method = "rtu"

port = "/dev/ttyUSB0"

baudrate = 2400

stopbits = 1

bytesize = 8

parity = "N"

timeout = 1

retries = 2

try:

client = ModbusClient(method = method, port = port, stopbits = stopbits, bytesize = bytesize, parity = parity, baudrate = baudrate, timeout = timeout, retries = retries)

connection = client.connect()

except:

print "Modbus connectie error / EASTRON SDM120"

def kwh(appid):

try:

data = client.read_input_registers(342, 2, unit=appid)

decoder = BinaryPayloadDecoder.fromRegisters(data.registers, endian=Endian.Big) # endian=Endian.Little / endian=Endian.Big

eastron_sdm120_kwh = round(decoder.decode_32bit_float(), 3)

client.close()

return eastron_sdm120_kwh

except:

print "Modbus register error (kwh)"

return 0

print kwh(1)

Voorbeeld uitlezen met pymodbus 2.4.0+ versie:

#!/usr/bin/env python
 
# Modbus uitlezen
# Apparaat: EASTRON SDM120 (KWh meter)
#
# Script gemaakt door S. Ebeltjes (domoticx.nl)
 
from __future__ import division
import pymodbus
import serial
from pymodbus.pdu import ModbusRequest
from pymodbus.client.sync import ModbusSerialClient as ModbusClient #initialize a serial RTU client instance
from pymodbus.transaction import ModbusRtuFramer
 
from pymodbus.constants import Endian              # Nodig voor 32-bit float getallen (2 registers / 4 bytes)
from pymodbus.payload import BinaryPayloadDecoder  # Nodig voor 32-bit float getallen (2 registers / 4 bytes)
from pymodbus.payload import BinaryPayloadBuilder  # Nodig om 32-bit floats te schrijven naar register
 
method = "rtu"
port = "/dev/ttyUSB0"
baudrate = 9600
stopbits = 1
bytesize = 8
parity = "N"
timeout = 1
retries = 2
appid = 1

try:
  client = ModbusClient(method = method, port = port, stopbits = stopbits, bytesize = bytesize, parity = parity, baudrate = baudrate, timeout = timeout, retries = retries)
  connection = client.connect()
except:
  print "Modbus connectie error"

#SDM120 - Read KWH
try:
  data = client.read_input_registers(342, 2, unit=appid)
  decoder = BinaryPayloadDecoder.fromRegisters(data.registers, byteorder=Endian.Big, wordorder=Endian.Big)
  kwh = round(decoder.decode_32bit_float(), 3)
  client.close()
except:
  print "Modbus error"

#SDM120 - Read VOLT
try:
  data = client.read_input_registers(0, 2, unit=appid)
  decoder = BinaryPayloadDecoder.fromRegisters(data.registers, byteorder=Endian.Big, wordorder=Endian.Big)
  volt = round(decoder.decode_32bit_float(), 3)
  client.close()
except:
  print "Modbus error"


print volt
print kwh

#!/usr/bin/env python

# Modbus uitlezen

# Apparaat: EASTRON SDM120 (KWh meter)

# Script gemaakt door S. Ebeltjes (domoticx.nl)

from __future__ import division

import pymodbus

import serial

from pymodbus.pdu import ModbusRequest

from pymodbus.client.sync import ModbusSerialClient as ModbusClient #initialize a serial RTU client instance

from pymodbus.transaction import ModbusRtuFramer

from pymodbus.constants import Endian # Nodig voor 32-bit float getallen (2 registers / 4 bytes)

from pymodbus.payload import BinaryPayloadDecoder # Nodig voor 32-bit float getallen (2 registers / 4 bytes)

from pymodbus.payload import BinaryPayloadBuilder # Nodig om 32-bit floats te schrijven naar register

method = "rtu"

port = "/dev/ttyUSB0"

baudrate = 9600

stopbits = 1

bytesize = 8

parity = "N"

timeout = 1

retries = 2

appid = 1

try:

client = ModbusClient(method = method, port = port, stopbits = stopbits, bytesize = bytesize, parity = parity, baudrate = baudrate, timeout = timeout, retries = retries)

connection = client.connect()

except:

print "Modbus connectie error"

#SDM120 - Read KWH

try:

data = client.read_input_registers(342, 2, unit=appid)

decoder = BinaryPayloadDecoder.fromRegisters(data.registers, byteorder=Endian.Big, wordorder=Endian.Big)

kwh = round(decoder.decode_32bit_float(), 3)

client.close()

except:

print "Modbus error"

#SDM120 - Read VOLT

try:

data = client.read_input_registers(0, 2, unit=appid)

decoder = BinaryPayloadDecoder.fromRegisters(data.registers, byteorder=Endian.Big, wordorder=Endian.Big)

volt = round(decoder.decode_32bit_float(), 3)

client.close()

except:

print "Modbus error"

print volt

print kwh

Voorbeeld baudrate instellen pymodbus v2.4.0+ versie:

# SCHRIJF nieuwe baudrate
def setbaud(appid, newbaud):
  try:
    builder = BinaryPayloadBuilder(byteorder=Endian.Big, wordorder=Endian.Big)
    builder.add_32bit_float(newbaud)
    payload = builder.to_registers()
    payload = builder.build()
    data = client.write_registers(28, payload, skip_encode=True, unit=appid)
    client.close()
    print "Baudrate aangepast naar", newbaud
    return 1
  except:
    print "Modbus register error (setbaud), staat de unit nog op -SET- ?"
    return 0

setbaud(1, 2)

# SCHRIJF nieuwe baudrate

def setbaud(appid, newbaud):

try:

builder = BinaryPayloadBuilder(byteorder=Endian.Big, wordorder=Endian.Big)

builder.add_32bit_float(newbaud)

payload = builder.to_registers()

payload = builder.build()

data = client.write_registers(28, payload, skip_encode=True, unit=appid)

client.close()

print "Baudrate aangepast naar", newbaud

return 1

except:

print "Modbus register error (setbaud), staat de unit nog op -SET- ?"

return 0

setbaud(1, 2)

[#/handleidingen/modbus_eastron_SDM120″ ]

Zoeken

Modbus – KWh meter – Eastron SDM120

BESTELLEN

Info (ENG)

Schema’s

Foto’s

Mobus registers

Voorbeeld uitlezen