What is designed to facilitate communication between embedded programmable logic controllers?

Modbus is a communication protocol specifically designed for use in industrial applications to facilitate communication between devices such as embedded programmable logic controllers (PLCs). This protocol is widely used because it allows for the simple and efficient transfer of data over serial lines and TCP/IP networks. Its structure enables multiple master and slave devices to communicate, making it ideal for scenarios where various types of control systems and devices need to work together seamlessly.

This versatility is a key reason why Modbus is a preferred choice in environments with numerous PLCs that require effective data exchange and monitoring. The protocol operates with simplicity and ease of integration, offering robustness for industrial applications. This focus on communication efficiency makes Modbus particularly effective in managing and controlling processes in real-time.

Fieldbus, while also a networked communication system meant for real-time distributed control, consists of a variety of proprietary systems that may not always be compatible with each other, potentially complicating communication between different devices. Controller Area Network (CAN) is another excellent communication protocol but is mainly used in automotive and industrial sectors for connecting various devices. Data Historian does not provide direct communication between controllers; instead, it gathers and stores data from various sources for later analysis, which is not its primary function for immediate controller communication.