EtherNet/IP i.e. Ethernet Industrial Protocol is an open communications protocol which was developed by Rockwell Automation and managed by ODVA. It is designed for use in process control and other industrial automation applications. This industrial application layer protocol operates over the Ethernet medium and employed for communication between industrial control systems and their components, such as a programmable automation controller, programmable logic controller or an I/O system. It is based on the Common Industrial Protocol (CIP) standard used in DeviceNet, CompoNet and ControlNet. EtherNet/IP is now an open technology which classifies Ethernet nodes as predefined device types with specific behaviors. This allows:
- Transfer of basic I/O data via UDP-based implicit messaging
- Uploading and downloading of parameters, setpoints, programs and recipes via TCP (i.e., explicit messaging.)
- Polled, cyclic and change-of-state monitoring via UDP, such as RPI and COS in Allen Bradley's ControlLogix control systems.
- One-to-one (unicast), one-to-many (multicast), and one-to-all (broadcast) communication via TCP.
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