16 Rockwell Automation Publication 842E-UM002A-EN-P - November 2013
Chapter 2 About the Encoder
CIP Sync Overview
EtherNet/IP uses CIP Sync and CIP Motion technologies to provide real-
time closed-loop motion control with standard Ethernet. This topology-
independent network provides a simplified integration of the entire
control solution on one network.
CIP Sync provides a mechanism to synchronize clocks between
controllers, I/O devices, and other automation products in your
architecture with minimal user intervention. The EtherNet/IP network is
the only network that supports CIP Sync time synchronization.
CIP Sync brings together CIP (Common Industrial Protocol) with the
IEEE 1588-2008 standard for time synchronization. CIP Sync provides
accurate real-time (Real-World Time) or Coordinated Universal Time (UTC)
synchronization of controllers and devices connected over CIP networks
and the ControlLogix backplane. This technology supports highly
distributed applications that require time stamping, sequence of events
recording, distributed motion control, and increased control
coordination.
CIP Sync provides the capabilities to perform the following functions:
• Create sequence of events applications
• System-wide synchronization of time for CIP-based networks
• Integrated Motion on the EtherNet/IP network applications
Typical Configurations
This section explains typical configurations and topologies. The 842E-CM
encoders can be connected in any of three network topologies: star,
linear or device level ring (DLR).
Rockwell Automation recommends that you use no more than 50 nodes on a
single DLR or linear network. If your application requires more than 50 nodes,
we recommend that you segment the nodes into separate, but linked, DLR or
linear networks.
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