Omron CJ1W-FLN22, Operation Manual, Page: 227 / 277

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Network System Definitions Appendix C
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.
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:
No. Name Port No.
1 Cyclic transmission port number 55000 (fixed)
2 Message communications port number 55001 (fixed)
3 Participation request frame port number 55002 (fixed)
4 Send port number 55003 (fixed)
14 20 8
1,024 bytes max.
User data
User data
FL-net header
UDP header
IP header UDP header
UDP header IP header Ethernet header FL-net data Trailer
FL-net data
FL-net data
UDP segment
IP datagram
Ethernet frame