Technical data

60 Rockwell Automation Publication 1769-TD005I-EN-P - August 2014
CompactLogix Controllers Specifications
Controller Connections
A CompactLogix system uses the connection types to establish communication links between devices:
• Controller-to-local I/O modules or local communication modules
• Controller-to-remote I/O or remote communication modules
• Controller-to-remote I/O (rack-optimized) modules
• Produced and consumed tags
• Messages
• Controller access by the programming software
• Controller access by RSLinx® Classic software for HMI or other applications
You indirectly determine the number of connections the controller uses by configuring the controller to communicate with
other devices in the system. The limit of connections can ultimately reside in the communication module you use for the
connection. If a message path routes through a communication module, the connection that is related to the message also
counts toward the connection limit of that communication module.
CompactLogix 5370 Controller Ethernet Node Limits and Connections
When designing a CompactLogix 5370 control system, you must consider the following:
• Maximum number of Ethernet nodes available for your controller’s project
• Connections
The controller that you select determines the number of Ethernet nodes available.
All CompactLogix 5370 controllers support 256 CIP connections and 120 TCP/IP connections.
Cat. No. Ethernet Nodes Supported
1769-L16ER-BB1B 4
1769-L18ER-BB1B
8
1769-L18ERM-BB1B
1769-L24ER-QB1B
8
1769-L24ER-QBFC1B
1769-L27ERM-QBFC1B
16
1769-L30ER 16
1769-L30ERM
1769-L30ER-NSE
1769-L33ER 32
1769-L33ERM
1769-L36ERM 48