58 Rockwell Automation Publication 2080-UM002K-EN-E - March 2019
Chapter 5 Communication Connections
• EtherNet/IP Client/Server
• Modbus TCP Client/Server
• DHCP Client
• Sockets Client/Server TCP/UDP
Here are some configuration examples based on the limits described in the table
above:
1. The maximum number of drives that can be controlled over EtherNet/IP
is 16. This is due to the maximum limit of TCP Client connections is 16,
and the maximum limit of EtherNet/IP Client connections is also 16.
2. If you have 10 devices controlled over EtherNet/IP, the maximum number
of devices that can be controlled over Serial is six. This is due to the
maximum limit of Client connections is 16.
Connection Limits for Micro830/Micro850/Micro870 Controllers
Description Micro830 Micro850/
Micro870
CIP Connections
Total number of client plus server connections for all ports 16 24
Maximum number of client connections for all ports 15 16
Maximum number of server connections for all ports 16 24
Maximum number of EtherNet/IP connections Client – 16
Server 23
Maximum number of USB connections Client – –
Server 15 23
Maximum number of Serial connections Client 15 16
Server 15 23
TCP Connections
Total number of client plus server connections – 64
Maximum number for EtherNet/IP Client 16
Server 16
Maximum number for Modbus TCP Client 16
Server 16
Maximum number for User Programmable Sockets 8
User Programmable Sockets
Total number of User Programmable Sockets
(any combination of UDP plus TCP Client/Server)
–8
If all client/server connections are fully loaded, performance may be
affected, such as data loss and intermittent delays during
communication.