Yaskawa JAPMC-MC2303-E - Manual (Page 74)

5
Details of FL-net
5.2 About FL-net
5.2.1 FL-net Overview
5-7
( 6 ) Data Communication Types
FL-net data communication supports cyclic transmission and message transmission.
„
Cyclic Transmission
Cyclic transmission is token-based cyclic data transmission. Each node shares data via the common memory.
„
Message Transmission
Message transmission is non-cyclic data transmission.
Usually, communication with a specific node is performed when a send request is sent.
ΠFor details of data communication, refer to 5.3 FL-net Data Communication on page 5-9.
( 7 ) Amount of Transmission Data
„
Cyclic Transmission
The network has an area of 8.5 kwords (= 8 kbits [0.5 kword] + 8 kword) in all.
The maximum amount of send data available per node is 8.5 kwords. However, one word corresponds to two bytes.
„
Message Transmission
The maximum amount of data in one message frame is 1,024 bytes (without header).
Node
Cyclic data or token
Node
Message data
Area 1 0.5 kword
8 kword
Common memory area
Area 2
Message frame
1,024 bytes