Yaskawa JAPMC-MC2303-E - Manual (Page 72)

5
Details of FL-net
5.2 About FL-net
5.2.1 FL-net Overview
5-5
5.2 About FL-net
The following gives an overview of FL-net and transmission method features.
5.2.1 FL-net Overview
( 1 ) FL-net Concept
FL-net acts as an Ethernet-based FA control network and comprises cyclic and message transmission functions.
The basic concept of FL-net is shown below.
• Ethernet works as a communication media (physical level and data link) between FA controllers.
• UDP/IP, which has been widely employed in Ethernet, is used as a basic data transmission means.
• The basic transmission means above are used to manage and control communication media access of each node
in the network (avoid collisions), to assure that transmission is performed in a specific time.
FL-net acts as an FA control network for data exchange between controllers such as the programmable controller
(PLC), robot controller (RC), and computer numeric control (CNC) equipment in a production system with personal
computers for control.
The following figure shows FL-net and its surroundings.
( 2 ) FL-net Protocol
FL-net consists of six protocol layers as shown below.
The transport and network layers use UDP/IP, while the data link and physical layers use Ethernet.
MP2200 218IF-02 262IF-01 LIO-04 SVB-01 CPU-02 LIO-04 LIO-04 LIO-01 LIO-01 MP2300 218IF-02 262IF-01 SVB-01
PC PC PC EWS
PLC PLC PLC
Server
WAN
Panel
controller CNC RC
Sensor actuator
Computer
Controller
Equipment
Upper LAN Ethernet 䋨TCP/IP, UDP/IP䋩
FL-net (Ethernet-based control network)
Field network
FA link protocol layer
Application layer
Transport layer
Network layer
Data link layer
Physical layer
Controller interface
UDP
Token function
Service function
Cyclic transmission
Message transmission
IP
Ethernet
(Based on IEEE802.3)
FL-net
protocol