Rockwell Automation 1768-EWEB EtherNet/IP Web Server Module User Manual - Manual (Page 127)

Publication ENET-UM527E-EN-P - October 2006
Socket Interface 127
You can partition the 20 available socket instances between UDP and
TCP sockets. For example:
• Use all 20 instances for client TCP connections
• Use one instance to listen for incoming TCP connections and
then accept 19 connections from other device
• Perform both TCP client and server operations
• Perform both TCP and UDP operations
These socket services are available.
Once you open a connection on a client socket instance, you cannot
use the same socket instance to accept incoming connections.
Similarly, if you accept connections on a socket instance, you cannot
then use the instance to open outgoing connections. This behavior is
consistent with standard socket API behavior.
This Socket Service The Socket Instance Is See Page
CreateSocket Server or client 141
OpenConnection Client 143
AcceptConnection
• if you issue an AcceptConnection service, the instance is listen type
• if the AcceptConnection service returns an instance as a result of an
incoming connection request, the socket instance is server type
146
Read Server or client 148
Write Server or client 151
DeleteSocket Server or client 153
DeleteAllSockets Server or client 154