126 Rockwell Automation Publication 1769-UM021G-EN-P - October 2015
Chapter 6 Communicate over Networks
Devices Included in the Node Count
Any devices that you add directly to the local Ethernet I/O configuration are
counted toward the node limitation of the controller. The following are example
devices that are added to the I/O configuration section in your project and must
be counted:
• Remote communication adapters
• I/O modules that are directly connected to the EtherNet/IP network, for
example the 1732E-IB16M12R ArmorBlock®? EtherNet/IP module
• Motion devices, such as drives
• Remote controllers
• HMI devices that are included in the I/O configuration section, for
example, PanelView™ Plus terminals
• Linking devices, such as the 1788-EN2DNR, Ethernet-to-DeviceNet
linking device
• Third-party devices that are directly connected to the EtherNet/IP
network
While CompactLogix 5370 controllers offer the option of using Ethernet node
count to effectively design a control system, the controllers do have connection
limits on an EtherNet/IP network.
For more information on how to design EtherNet/IP network use in your
CompactLogix 5370 control system, see these resources:
• The EtherNet/IP Capacity Tool available at http://
www.rockwellautomation.com/rockwellautomation/products-
technologies/integrated-architecture/tools/overview.page#/tab3.
The EtherNet/IP Capacity Tool helps you in the initial layout of your
EtherNet/IP network.
• Ethernet Design Considerations Reference Manual, publication
ENET-RM002.
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