Create Modbus TCP data points

Modbus TCP data points read and write the individual Modbus values of a Modbus TCP device. They are used within logic groups via Modbus TCP value input and Modbus TCP value output.

A new data point is created by clicking on the grey area with the “plus” sign.

When creating new data points, a window opens in which the following parameters are specified.

General

• Name:
  Enter a descriptive name for the data point here

• Description:
  You can enter a more detailed description or important information about the data point in this text field

• Data type:
  Select the data type of the Modbus register here. The options are
  Float, Integer, Unsigned Integer and String.
  The selection determines how the received or sent values are interpreted.

Register settings

In this section, you can configure the basic parameters for accessing the Modbus register.

• Unit ID
  Specifies the device address (slave ID) of the Modbus participant, which uniquely identifies the target device on the network.

• Register type
  Select the type of register to be accessed (e.g. holding register, input register, coil or discrete input). This determines the type of read or write access.

• Address
  Specifies the register address to be accessed.

• Depending on the manufacturer, the addressing may be 0-based or 1-based.
  Please refer to the documentation for the Modbus device.

• Polling interval in seconds
  Specifies the time interval at which values are retrieved from the Modbus device. A smaller value results in more frequent updates, but increases the bus load.

///