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On this page
  • Data Source Endpoint
  • Data Tag Address
  • Modbus Options (provided in JSON format)
  1. Knowledge Base
  2. Edge
  3. Common Data Sources

Modbus TCP

PreviousOPC-UANextEthernet IP

Last updated 4 months ago

Data Source Endpoint

  • Format: plcIP:plcPort

  • Default port: 502

  • Example: 192.168.2.2:502

Data Tag Address

  • Use the register location in the holding register.

  • Examples: "452" or "12"

Modbus Options (provided in JSON format)

Modbus also accepts the following fields as options

  • scale: Multiplies the read value for scaling. Example: "scale": 0.0001

  • functionCode: Specifies the register type:

    • 3: Input Registers

    • 4: Holding Registers Example: "functionCode": 3

  • bytesToRead: Defines the number of bytes to read. Example: "bytesToRead": 2

  • dataType: Converts the read data to the specified type (default is UInt16). Accepted types: ['int8', 'uint8', 'int16', 'uint16', 'int32', 'uint32', 'int64', 'uint64', 'float', 'double', 'utf8', 'ascii'] Example: "dataType": "int32"

  • endianness: Sets byte order (default is Big Endian BE). Options: "BE" or "LE" Example: "endianness": "BE"

  • decimals: Rounds floating-point values to limit decimal places (useful for precision errors).

Example JSON Configuration

{
  "scale": 0.0001,
  "functionCode": 3,
  "bytesToRead": 2,
  "dataType": "int32",
  "endianness": "BE"
}