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15-12
Chapter 15: Appendix
15
15-3 Definition of network systems
[1] Communication protocol standards
The term "Communication protocol" refers to the rules for exchanging information between systems on
a particular communication circuit. The communication protocols used by FL-net conform to the follow-
ing standards.
FL-net communication protocols
[2] Hierarchical structure of the communication protocols
The communication protocols are configured as a layered structure. Communication processes are
expressed and standardized by classification and they are arranged in various levels. The FL-net con-
sists of the following six protocol layers.
FL-net
protocol
Hierarchical structure of the FA link protocol
FL-net supported
communication protocol
Compatible specifications
FL-net
FA link protocol specification sheets
(MSTC FA open promotion committee, issued by the
FA control network promotion committee)
UDP RFC768
IP, ICMP etc. RFC791, 792, 919, 922, 950
APR etc. RFC826, 894
Ethernet IEEE802.3
Application layer Controller interface
FA link protocol layer
Cyclic transfer
Service function
Message transfer
Token function
Transport layer UDP
Network layer IP
Data link layer
Ethernet
(Compatible with IEEE802.3)
Physical layer