Allen-Bradley MicroLogix 1400 Instruction Manual page 483

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Typical Sequence of Transactions for a TCP Client
MSG in Ladder
Program
CreateSocket
OpenConnection
"10.10.10.11?Port=49200"
Write
Data = abc
Read
Timeout = 10000 ms
Additionally, each Write does not require an application response or
acknowledgement. The application protocol determines the exact
sequence of application transactions.
Ethernet Subsystem
10.10.10.10
CreateSocket Response
Instance=102
Open TCP Connection
OpenConnection Response
Data = abc
Write Response
The response is returned to the
controller as soon as the data is sent
Read Response
Data = xyz
Typical Sequence of Transactions For a TCP Server
The following diagram shows a typical sequence of socket interface
transactions with the MicroLogix controller as a TCP server.
Socket Interface Using CIP Generic Messaging
Remote Ethernet Device
10.10.10.11
Accept TCP Connection
Receive Data
Send Data
Data = xyz
Publication 1766-RM001A-EN-P - October 2008
481