Rockwell Automation 1768-EWEB EtherNet/IP Web Server Module User Manual - Manual (Page 143)

Publication ENET-UM527E-EN-P - October 2006
Socket Interface 143
Considerations
Use the instance returned by CreateSocket on subsequent service
requests.
Use a MOV instruction to move the instance to another MSG tag (the
.Instance field).
If you use a local port number that is already in use by the web server,
you receive an EADDRINUSE error (see Error Codes section). The
web server uses these port numbers:
• 20, 21 – FTP
• 25 – SMTP
• 80 – HTTP
• 123 – NTP
• 161 – SNMP
• 2222 – EtherNet/IP
• 44818 – EtherNet/IP
OpenConnection The OpenConnection service does one of the following:
• Opens a TCP connection with the specified destination address
• For UDP, associates a destination IP address and port number
with the specified socket
MSG Configuration Parameters
To call this service, click in the MSG instruction and enter the
values displayed below.
Parameter Value
Service Type OpenConnection
Service Code 4c
Class 342
Instance from CreateSocket
Attribute 0