Ecodan Modbus Register 172: Device Last Measured Total Energy Produced

Technical Definition

The register device Last Measured Total Energy Produced at address 172 is used to monitor device last measured total energy produced on the Ecodan.

• Protocol: Modbus RTU
• Data Type: U WORD
• 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 device Last Measured Total Energy Produced (Address: 172)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=172, 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: "device Last Measured Total Energy Produced"
  address: 172
  value_type: U_WORD
  unit_of_measurement: "kWh"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Ecodan]

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

💡 Engineer's Insight

Analysis: Total accumulated energy produced by the device over its lifetime, typically in kWh. Historical energy generation.

Troubleshooting: Zero value indicates the device is new, has been reset, or the energy production meter is not functioning.