Hitachi S10mini User Manual page 246

8 APPENDIXES
8.4 FL-net Network Management
8.4.1 FL-net token management
(1) Token
Under normal conditions, a node can transmit data while it holds the token. A node without
the token can transmit only two items: a token reissue request in the event of a token
monitoring timeout and an enter request frame for situations where network enter is not
completed.
The FA net circulates one token among nodes.
Upon receipt of the token, a node holds the right to transmit data to the network until it
passes the token to the next node.
The token circulates among all nodes that have entered in the FL-net.
The token is monitored by a timer in such a manner that it is automatically reissued if it stops
circulating through the network for a predetermined period of time.
If two or more tokens should exist within the network, a unification feature works so that
only one token prevails.
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