Statistics Maximum Apparent Power Demand Modbus Register 30103: Entities name prefix - slave entities prefix name - Maximum Apparent Power Demand

Technical Definition

The register entities name prefix - slave entities prefix name - Maximum Apparent Power Demand at address 30103 is used to monitor entities name prefix - slave entities prefix name - maximum apparent power demand on the Statistics Maximum Apparent Power Demand.

• Protocol: Modbus RTU
• Data Type: U DWORD
• Unit: VA
• 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 entities_name_prefix - slave_entities_prefix_name - Maximum Apparent Power Demand (Address: 30103)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=30103, 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: "entities_name_prefix - slave_entities_prefix_name - Maximum Apparent Power Demand"
  address: 30103
  value_type: U_DWORD
  unit_of_measurement: "VA"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Statistics Maximum Apparent Power Demand]

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

💡 Engineer's Insight

Analysis: The highest recorded apparent power demand over a defined period. Units: Volt-Amperes (VA) or kiloVolt-Amperes (kVA).

Troubleshooting: A value of 0 could mean no demand has been recorded or a potential issue with the measurement system.