Em340 Package Modbus Register 48: modbus controller name PF L3

Technical Definition

The register modbus controller name PF L3 at address 48 is used to monitor modbus controller name pf l3 on the Em340 Package.

• Protocol: Modbus RTU
• Data Type: S WORD
• Unit: %
• 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 PF L3 (Address: 48)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=48, 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 PF L3"
  address: 48
  value_type: S_WORD
  unit_of_measurement: "%"

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: Power Factor (PF) for Line 3 (L3). Unitless, ranging from -1 to +1. Measures electrical efficiency.

Troubleshooting: Zero PF could mean a fault in L3 measurement or a reactive-only load. Inspect L3 voltage and current readings.