Modbus Communication Using Programmatic Workflow

MODBUS Interface Supported Features

Instrument Control Toolbox MODBUS support lets you communicate with MODBUS servers and applications over TCP/IP or Serial RTU.

Create a MODBUS Connection

To communicate over the MODBUS interface, you first create a MODBUS object using themodbusfunction. Creating the object also makes the connection.

Configure Properties for MODBUS Communication

You can use properties to set up the MODBUS communication during object creation or any time.

Read Data from a MODBUS Server

You can read data from the MODBUS server connected to themodbusobject. You can read coils, inputs, input registers, and holding registers.

Read Temperature from a Remote Temperature Sensor

This example shows how to read temperature and humidity measurements from a remote sensor on a PLC connected via TCP/IP.

Write Data to a MODBUS Server

You can write data to the MODBUS server connected to themodbusobject. You can write to coils and holding registers.

Write and Read Multiple Holding Registers

You can perform a combination of one write operation and one read operation on groups of holding registers in a single MODBUS transaction.

Modify the Contents of a Holding Register Using a Mask Write

您可以修改存储寄存器的内容using a combination of an AND mask, an OR mask, and the register's current contents.

Modbus Communication Using the Modbus Explorer

Use the Modbus Explorer App

You can read and write to coils and registers in the Modbus Explorer app.

Configure a Connection in the Modbus Explorer

The first step in using the Modbus Explorer to communicate with a PLC or other Modbus device is to configure the communication with the device, either over TCP/IP or Serial RTU.

Read Coils, Inputs, and Registers in the Modbus Explorer

You can read coils, inputs, input registers, and holding registers in the Modbus Explorer. This is the functionality of the Modbusreadfunction.

Write to Coils and Holding Registers in the Modbus Explorer

You can write to coils and holding registers in the Modbus Explorer. This is the functionality of the Modbuswritefunction.

Control a PLC Using the Modbus Explorer

This example shows how to perform reads and writes to a PLC using the Modbus Explorer.

Generate a Script from Your Modbus Explorer Session

You can generate a MATLAB script from your Modbus Explorer session, and then run it at the command line using the Instrument Control Toolbox Modbus functionality.