EtherNet/IP (CIP)
What is EtherNet/IP (CIP)?
EtherNet/IP carries the Common Industrial Protocol (CIP) over standard Ethernet/IP using TCP and UDP. It supports explicit messaging for configuration and implicit, cyclic I/O for real-time control.
Examples
- A controller establishes an implicit I/O connection to a remote I/O rack at 10 ms RPI using UDP; the switch uses IGMP snooping to manage multicast.
- An HMI uses explicit messaging (Get/Set Attribute Single) over TCP to read a drive’s speed and write a parameter change during maintenance.
Discover 🔎
EtherNet/IP is a widely deployed industrial Ethernet protocol defined by ODVA. It encapsulates the Common Industrial Protocol (CIP) over TCP/UDP, giving a single object model across devices like PLCs, drives, and I/O. Its strengths are vendor interoperability, fast cyclic I/O, and rich configuration services. Safe and reliable operation depends on proper network engineering (multicast control, QoS, timing) and tight access controls for configuration traffic.
Summary 📝
EtherNet/IP ties diverse industrial devices together with a shared object model and fast cyclic I/O. Robust operation depends on disciplined network design—multicast control, QoS, and time sync—plus strict control of explicit messaging and engineering access. Where available, CIP Safety and CIP Security add safety integrity and cryptographic protection to the stack.
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