15-19
Chapter 15: Appendix
15
15-4 Network control of the FL-net
[1] Token control of the FL-net
(1) Token
Basically, a node can send data whenever it holds a token. A node can send data without holding a
token when it reissues a token due to a time out of the token monitor time, or when it issues a
participation request frame so that it can begin participating in the network.
The FA net routes one token between the nodes.
Each node keeps the right to send data over the network from the time it receives the token until
it passes the token to another node.
The token flows through all the nodes participating in an FL-net.
A token can be sent together with cyclic data.
A token can be routed without data.
Tokens are monitored by the timer. If the token is not passed along through the network for a
certain interval, the network will automatically reissue a token.
If there are two tokens on the same network, the JW-50FL will unify them into one token.
