What communication protocol is commonly used in distributed control systems (DCS) for engine room automation?

Several communication protocols are commonly used in Distributed Control Systems (DCS) for engine room automation, but Modbus and Profibus are among the most prevalent, with Ethernet-based protocols like Modbus TCP/IP and Profinet gaining increasing popularity. Modbus is a serial communication protocol originally developed for use with PLCs. It is a relatively simple and open protocol, making it easy to implement and widely supported by various devices. Modbus is often used for communication between the DCS and field devices such as sensors, actuators, and motor starters. Profibus is another serial communication protocol that is widely used in industrial automation. It is a more sophisticated protocol than Modbus, offering faster communication speeds and more advanced features. Profibus is often used for communication between different DCS components, such as controllers and I/O modules. Modbus TCP/IP is an Ethernet-based version of Modbus that offers the advantages of Ethernet connectivity, such as higher bandwidth and easier integration with other network devices. Profinet is another Ethernet-based protocol that is specifically designed for industrial automation. It offers real-time communication capabilities and is often used for applications requiring precise synchronization and control. The choice of communication protocol depends on the specific requirements of the engine room automation system, such as the number of devices, the communication speed, and the level of integration with other systems.