Default Enm 223 R1 Plc Lite Modbus Register 250: Enm prefix Line Frequency

Technical Definition

The register enm prefix Line Frequency at address 250 is used to monitor enm prefix line frequency on the Default Enm 223 R1 Plc Lite.

• Protocol: Modbus RTU
• Data Type: U WORD
• Unit: Hz
• 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 enm_prefix Line Frequency (Address: 250)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=250, 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: "enm_prefix Line Frequency"
  address: 250
  value_type: U_WORD
  unit_of_measurement: "Hz"

Connection Diagram

Here is the standard RS485 wiring for this configuration:

graph TD
    PLC[Host Controller / Home Assistant]
    Device[Default Enm 223 R1 Plc Lite]

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

💡 Engineer's Insight

Analysis: Electrical line frequency in Hertz (Hz). Typically 50 Hz or 60 Hz for AC power systems.

Troubleshooting: Incorrect frequency may indicate grid instability, generator issues, or incorrect meter configuration.