Em340 Package Modbus Register 78: modbus controller name kWh out total

Technical Definition

The register modbus controller name kWh out total at address 78 is used to monitor modbus controller name kwh out total on the Em340 Package.

• Protocol: Modbus RTU
• Data Type: S DWORD R
• Unit: kWh
• Access: Read Only

How to Read (Python pymodbus)

Use this code snippet to read this specific value via RS485:

from pymodbus.client.sync import ModbusSerialClient

client = ModbusSerialClient(method='rtu', port='/dev/ttyUSB0', baudrate=9600)
client.connect()

# Read modbus_controller_name kWh out total (Address: 78)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=78, count=2, unit=1)

if not result.isError():
    print(f"Raw Value: {result.registers}")
else:
    print("Error reading register")

client.close()

Integration (Home Assistant)

Paste this into your configuration.yaml:

- platform: modbus_controller
  name: "modbus_controller_name kWh out total"
  address: 78
  value_type: S_DWORD_R
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Em340 Package]

    PLC -- "A+ (D+)" --> Device
    PLC -- "B- (D-)" --> Device
    PLC -- GND --> Device

💡 Engineer's Insight

Analysis: Total cumulative energy generated/exported in kilowatt-hours (kWh). Tracks energy produced and sent out.

Troubleshooting: Zero value suggests no energy generation or export, or a meter communication issue. Check generation source and meter.