Rockwell-automation 1768-EWEB EtherNet/IP Web Server Module User Manua Manual do Utilizador descarregar pdf (Página 142)

Publication ENET-UM527E-EN-P - October 2006

142 Socket Interface

Select the data type you created in the Source Element field of the

Message Configuration dialog.

MSG Source Length

Specify the size of the user-defined structure for the Source Element.

In this example, CreateParams is 12 bytes.

MSG Destination Element

The MSG instruction returns the instance number of the socket it just

created to the Destination Element. Specify a DINT tag (in this

example, SockInstance).

Element Data Type Description

Type DINT Specify:

• 1 for TCP

• 2 for UDP

Addr structure A user-defined structure that specifies the address for the socket.

Family INT Specify the address family. Must be 2.

Port INT Specify a local port number, or set to 0 (the local port number will be

chosen by the web server). For TCP client operations, specify 0 unless

you want a specific local port number. For TCP server communications,

specify the port number on which to accept incoming connection

requests. For UDP, to receive datagrams on a specific port, you must

specify a local port number.

Addr DINT Specify an IP address. Typically, set to 0 (any address).

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Rockwell-automation 1768-EWEB EtherNet/IP Web Server Module User Manua Manual do Utilizador Página 142