Default Aio 422 R1 Plc Modbus Register 373: Aio prefix PID4 Kd

Technical Definition

The register aio prefix PID4 Kd at address 373 is used to monitor aio prefix pid4 kd on the Default Aio 422 R1 Plc.

• 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 aio_prefix PID4 Kd (Address: 373)
# Note: Check if your device uses 0-based or 1-based addressing
result = client.read_input_registers(address=373, 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: "aio_prefix PID4 Kd"
  address: 373
  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[Default Aio 422 R1 Plc]

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

💡 Engineer's Insight

Analysis: Derivative gain (Kd) for the PID controller. Tuning this impacts system stability and response speed. Units are typically unitless or per unit of time.

Troubleshooting: Zero indicates a disabled or improperly configured PID loop, or a potential error in parameter loading. Check controller settings.