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8 APPENDIXES
(3) Token and data
The following six different data patterns are used for token transmission:
Pattern
When no data is involved
Token
When only cyclic data is transmitted
Token
When only cyclic data is transmitted
after being divided into frames
Token
When only message data is transmitted The token is transmitted subsequently to message data
Token
When cyclic data and message data is
transmitted
Token
When cyclic data and message data are
transmitted with the cyclic data divided
into frames
Token
(4) Frame interval (minimum permissible frame interval)
The frame interval is the time interval between the instant at which the self-node receives the
token from another node and the instant at which the self-node starts a frame transmission.
The minimum permissible frame interval is the minimum period of time for which a node
must wait to initiate a frame transmission.
In FL-net, this minimum permissible frame interval is commonly used within the whole
network.
The maximum value of the minimum permissible frame intervals set by entering nodes in the
network is calculated and updated for all nodes upon each node enter/leave.
Table 8-6 Token and Data
Only the token is transmitted.
A token is transmitted after cyclic data is transmitted.
Cyclic data
Cyclic data is transmitted and, after the last frame, a token is
transmitted.
Cyclic data
Cyclic data
transmission.
Message data
Message data and cyclic data are transmitted, and then a token
is transmitted.
Cyclic data
Message data and cyclic data are transmitted and, after the last
frame, a token is transmitted.
Cyclic data
Description
Message data
Cyclic data
8-12
Message data
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