TCP Connections
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Overview
EtherNet/IP uses TCP connections as a pipeline for CIP connections Both connected and unconnected messaging use the TCP connection.
TCP Connection Limits
The TSX ETC 100 EtherNet/IP communication module can provide up to 67 TCP connections, as follows:
Connection type
Maximum number of connections
I/O adapter
641
I/O scanner
Explicit message client
Explicit message server
3
Total TCP connections:
67
164 connections can be used for any combination of:
  • I/O adapter connections
  • I/O scanner connections
  • explicit messages (as client)
A single TCP connection can support multiple CIP connections.
NOTE: TCP connections dedicated to other services, for example FTP, are not included in the above numbers.