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8 APPENDIXES
8.1 Network System Definitions
8.1.1 Standard compliance of communication protocol
A communication protocol is a set of rules (communication regulations) to enable a system to
exchange information with another system through a communications link. The communication
protocols adopted by the FL-net comply with the following standards:
FL-net communication protocol
FL-net
UDP
IP ICMP, etc.
ARP, etc.
−
8.1.2 Communication protocol hierarchical structure
A communication protocol is modeled in hierarchical form to express and standardize a
communication process by systematically dividing it into various levels. The FL-net consists of
the following six protocol layers.
Application layer
FA link protocol layer
Transport layer
Network layer
Data link layer
Physical layer
Table 8-1 FL-net Communication Protocols
FA Control Network
[FL-net (OPCN-2)] – Protocol Specification
(issued by Japan Electrical Manufacturers' Association
(JEMA)
RFC768
RFC791,792,919,922,950
RFC826,894
IEEE802.3
Figure 8-1 FA Link Protocol Definition
Standard complied with
Controller interface
Service feature
Cyclic
transmission
Message transmission
Token feature
UDP
IP
Ethernet
Conforming to IEEE802.3
8-2
FL-net
protocol
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