Esphome Web 10C200 Modbus Register 4000: 44001/2 Lifetime counter

Technical Definition

The register 44001/2 Lifetime counter at address 4000 is used to monitor 44001/2 lifetime counter on the Esphome Web 10C200.

• Protocol: Modbus RTU
• Data Type: U DWORD
• Unit: h
• 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 44001/2 Lifetime counter (Address: 4000)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=4000, 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: "44001/2 Lifetime counter"
  address: 4000
  value_type: U_DWORD
  unit_of_measurement: "h"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Esphome Web 10C200]

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

💡 Engineer's Insight

Analysis: Total accumulated energy/flow over the device's lifetime. Units likely kWh or m³.

Troubleshooting: Zero indicates no operation or a reset. Significant discrepancy might point to sensor failure or data logging issues.