Rockwell Automation 1768-EWEB EtherNet/IP Web Server Module User Manual - Manual (Page 133)

Publication ENET-UM527E-EN-P - October 2006
Socket Interface 133
For details on specific services, see See Socket Object Services on
page 140.
Message Transfer Sizes
The maximum amount of application data you can send or receive
depends on whether you configure the MSG instruction as connected
or unconnected. The size of the application data does not include the
parameters in the Read and Write services.
For TCP sockets, if the application data is larger than the maximum
size, you can issue multiple Reads or Writes to receive or send the
entire application message.
For UDP sockets, the size application data cannot exceed the
maximums listed for Read and Write services.
For more information on MSG instructions, see:
• Logix5000 Controllers General Instructions Reference Manual,
1756-RM003
• Logix5000 Controllers Common Procedures Programming
Manual, 1756-PM001
• EtherNet/IP Modules in Logix5000 Control Systems User Manual,
ENET-UM001
Source Length Specify the length of the Source Element.
Destination Contains the response data returned by the service.
Create a user defined type for the response data for each service.
Communication The communication path must point to the web server.
CIP Generic Msg Parameter Description
Service Connected or Unconnected
(Configured On the MSG
Communications tab) Maximum Amount Of
Application Data
Read Connected 484 bytes
Unconnected 484 bytes
Write Connected 472 bytes
Unconnected 462 bytes