User manual

50 Rockwell Automation Publication 1769-UM011I-EN-P - February 2013
Chapter 4 Communicate over Networks
The 1769-L32E and 1769-L35E controllers support 100 connections. However,
the built-in EtherNet/IP port supports only 32 CIP connections over an
EtherNet/IP network. With these controllers, the number of end-node
connections they effectively support depends on a connection’s RPI.
You can use all 32 communication connections on the built-in EtherNet/IP port.
However, we recommend that you leave some connections available for tasks
such as going online and non-I/O purposes.
ControlNet Network
Communication
ControlNet is a real-time control network that provides high-speed transport of
both time-critical I/O and interlocking data and messaging data, including
uploading and downloading of programming and configuration data on a single
physical-media link. The ControlNet network’s highly-efficient data transfer
capability significantly enhances I/O performance and peer-to-peer
communication in any system or application.
The ControlNet network is highly deterministic and repeatable and remains
unaffected as devices are connected or disconnected from the network. This
robust quality results in dependable, synchronized, and coordinated real-time
performance.
The ControlNet network often functions as:
• the default network for the CompactLogix platform.
• a substitute/replacement for the remote I/O (RIO) network because the
ControlNet network adeptly handles large numbers of I/O points.
• a backbone to multiple distributed DeviceNet networks.
• a peer interlocking network.
For ControlNet communication, you can use these CompactLogix controllers
with a built-in ControlNet communication port:
• 1769-L32C CompactLogix controller
• 1769-L35CR CompactLogix controller
Requested Packet Interval Max EtherNet/IP Port Communication Connections
2 ms 2
4 ms 5
8 ms 10
16 ms 18
32 ms+ 25+