Modbus modules are devices designed for Modbus communication in industrial applications. They are used to transfer data between devices via serial or Ethernet bus. These modules allow easy connection of devices to Modbus networks and provide monitoring, control and data acquisition from industrial equipment. They are used to integrate and manage data from various sensors, actuators, controllers and other devices in an automation environment. Modbus modules contribute to efficient communication between devices from different manufacturers and ensure compatibility and interoperability between them.