Modbus

The Modbus input polls a Modbus TCP device at a fixed interval and supports four register types: coils, discrete_inputs, holding_registers, and input_registers.

Configuration

Field	Type	Required	Default	Description
type	string	yes	—	Constant value "modbus"
addr	string	yes	—	Modbus TCP server address in host:port format
slave_id	integer	yes	—	Modbus slave ID
points	array<object>	yes	—	List of points read each poll, see table below
interval	duration	yes	—	Polling interval, e.g. 1s, 500ms

points[]

Field	Type	Required	Description
type	string	yes	Register type: coils / discrete_inputs / holding_registers / input_registers
name	string	yes	Data point name, used as the output field name
address	integer	yes	Starting register address
quantity	integer	yes	Number of registers to read

Examples

input:
  type: "modbus"
  addr: "192.168.1.100:502"
  slave_id: 1
  interval: "1s"
  points:
    - type: "holding_registers"
      name: "temperature"
      address: 100
      quantity: 2
    - type: "coils"
      name: "status_flags"
      address: 200
      quantity: 2