Rockwell Automation 1768-EWEB EtherNet/IP Web Server Module User Manual - Manual (Page 131)

Publication ENET-UM527E-EN-P - October 2006
Socket Interface 131
Typical Sequence of Transactions For UDP With OpenConnection
The following diagram shows a typical sequence of socket interface
transactions for UDP communications when using the
OpenConnection service to specify the destination address. Each
transaction between the Logix controller and the web server is a MSG
instruction.
The following is a typical sequence of transactions. The exact
sequence of sending and receiving data depends on the application
protocol.
Logix
controller
Web Server Module
10.10.10.10
Device
10.10.10.11
CreateSocket
Port=49100
CreateSocket
Response Instance =
102
OpenConnection
10.10.10.11?Port=49200
OpenConnection
Response
Read
Read Response
10.10.10.11?Port=49200
Data = xyz
Write
Data = abc
Write Response
Data = abc
Data = xyz
The response is returned to the
controller as soon as the data is sent.
Send Data To
10.10.10.10, port 49100
Receive Data From
Port 49200