Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual - Manual (Page 88)

Chapter 6
Using the Ethernet Interface
6-7
Figure 6.4
List of PROTOCOLS File
SERVICES File
The file C:\INET\SERVICES contains standard Internet information
followed by information that applies to your system. If you write
socket-library programs to establish application-specific servers, place the
“well-known” port numbers of your new services at the end of this file.
We recommend that you use numbers larger than 3000 for your services.
See Figure 6.5 through Figure 6.8 for an example.
The last three entries in Figure 6.8 show an example of application-specific
modifications to the SERVICES file.