Default Enm 223 R1 Plc Lite Modbus Register 251: Enm prefix Temperature

Technical Definition

The register enm prefix Temperature at address 251 is used to monitor enm prefix Temperature on the Default Enm 223 R1 Plc Lite.

• Protocol: Modbus RTU
• Data Type: S WORD
• Unit: °C
• 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 Temperature (Address: 251)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=251, 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 Temperature"
  address: 251
  value_type: S_WORD
  unit_of_measurement: "°C"

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: Temperature reading in degrees Celsius (°C) or Fahrenheit (°F). Reflects ambient or internal device Temperature.

Troubleshooting: Zero value could be sensor failure, disconnected sensor, or extreme cold affecting reading.