Omron CS1W-FLN22 Operation Manual page 227

Network System Definitions
FL-net Port Numbers
With FL-net, the following port numbers are assigned in advance to enable services in the FL-net protocol
layer, which is located above the transport layer. FL-net users, however, do not need to set these port numbers
in parameters or elsewhere.
No.
1 Cyclic transmission port number
2 Message communications port number
3 Participation request frame port number 55002 (fixed)
4 Send port number
FL-net Data Format
FL-net Data Format Overview
The data sent and received using FL-net is encapsulated using the following communications protocol layers,
as follows:
IP header
Ethernet header IP header
14
Name
55000 (fixed)
55001 (fixed)
55003 (fixed)
FL-net header
UDP header
UDP segment
UDP header
IP datagram
UDP header
20 8
Ethernet frame
Port No.
1,024 bytes max.
User data
User data
FL-net data
FL-net data
FL-net data
Appendix C
Trailer
201