EtherNet/IP is one of three open network standards (DeviceNetTM , ControlNetTM and EtherNet/IPTM ), which all use a common application layer, the “Common Industrial Protocol” (CIPTM ). This common application layer and open software and hardware interfaces allow a universal connection of automation components from the fieldbus level over the control level to the enterprise level.
The Common Industrial Protocol presents communication and application in the object model. Predefined objects facilitate the data exchange of different devices and manufacturers. By creating various device profiles, additional user benefits were achieved.
CIP is a connection based protocol. It defines the exchange of I/O data using I/O Messaging (or Implicit Messaging) as well as the exchange of general data for configuration, diagnostic and management via Explicit Messaging. CIP thus provides 4 essential functions to the user:
Common object model for application
Common communication model for data exchange in the network
Common configuration methods
Common device profiles
EtherNet/IP is the implementation of CIP over TCP/IP and Ethernet (IEEE 802.3).
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