Rockwell Automation Ethernet Design Considerations Reference Manual - Manual (Page 65)

Rockwell Automation Publication ENET-RM002C-EN-P - May 2013 65
EtherNet/IP Protocol Chapter 4
Nodes on an EtherNet/IP Network
CompactLogix 5370 controllers use the number of Ethernet nodes to stay within
their capacity for the number of connections. These controllers have limits on the
number of nodes they support in the I/O configuration within your controller
project.
Any devices you add directly to the local Ethernet node in the I/O configuration
are counted toward the controller’s node limitation. The following are example
devices that are added to the I/O configuration and must be counted:
• Remote communication adapters
• I/O modules directly connected to the EtherNet/IP network, for example
the 1732E-IB16M12R ArmorBlock® EtherNet/IP module
• Motion devices, such as drives
You do not count Ethernet devices that exist on the EtherNet/IP network but are
not added to the I/O configuration. These devices include the following:
• Computer
• HMI that are not added to the I/O configuration section, for example,
PanelView Plus terminals
• MSG instructions that do not use an RPI and are not time-critical
• Devices that communicate via a socket interface, such as
CompactLogix 5370 controllers
For more information, see the CompactLogix 5370 Controllers User Manual,
publication
1769-UM021 .
IMPORTANT This section applies to only CompactLogix 5370 controllers. For most
applications, proceed to
Table 12 on page 66 for network specifications.
Table 11 - CompactLogix 5370 Controller Ethernet Node Guidelines
Cat. No. Ethernet Nodes Supported
1769-L16ER-BB1B 4
1769-L18ER-BB1B
8
1769-L18ERM-BB1B
1769-L24ER-QB1B
1769-L24ER-QBFC1B
1769-L27ERM-QBFC1B
16
1769-L30ER
1769-L30ERM
1769-L30ER-NSE
1769-L33ER
32
1769-L33ERM
1769-L36ERM 48