Modbus Protocol: Industrial Automation Communication Standard

Modbus is a communication protocol commonly used in industrial automation systems. It allows for communication between devices such as programmable logic controllers (PLCs) and other field devices. The protocol is based on a master-slave architecture, where a master device initiates communication with one or more slave devices.

Modbus uses a simple and efficient binary protocol, making it suitable for use in a wide range of applications. It can be implemented over various physical media, including RS-485, Ethernet, and TCP/IP. The protocol supports both serial and Ethernet communication, with different variants available for each.

Modbus supports multiple data types, including integer, floating-point, and character data. It also includes various function codes for different types of operations, such as reading and writing data registers, controlling outputs, and requesting diagnostic information.

Overall, Modbus is widely used in industrial automation due to its simplicity, versatility, and compatibility with a wide range of devices. It has become a de facto standard in the industry, making it easy to integrate new devices into existing systems.