8 APPENDIXES
8-14
8.3 Network System Definitions
8.3.1 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:
Table 8-1 FL-net Communication Protocols
FL-net communication protocol
Standard complied with
FL-net
FA Control Network
[FL-net (OPCN-2)] – Protocol Specification
(issued by Japan Electrical Manufacturers’ Association
(JEMA)
UDP RFC768
IP ICMP, etc.
RFC791,792,919,922,950
ARP, etc.
RFC826,894
−
IEEE802.3
8.3.2 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
Controller interface
Service feature
Cyclic
transmission
Message transmission
FA link protocol layer
Token feature
Transport layer
UDP
Network layer
IP
Data link layer
Ethernet
Physical layer
Conforming to IEEE802.3
Figure 8-13 FA Link Protocol Definition
FL-net
protocol
Содержание FL.NET
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