8 APPENDIXES
8-25
Table 8-7 Token and Data (LQE502)
Pattern
Description
When no data is involved
Only the token is transmitted.
When only cyclic data is transmitted
A token is transmitted after cyclic data is transmitted.
When only cyclic data is transmitted
after being divided into frames
Cyclic data is transmitted and, after the last frame, a token is
transmitted.
When only message data is transmitted The token is transmitted subsequently to message data
transmission.
When cyclic data and message data is
transmitted
Message data and cyclic data are transmitted, and then a token
is transmitted.
When cyclic data and message data are
transmitted with the cyclic data divided
into frames
Message data and cyclic data are transmitted and, after the last
frame, a token is transmitted.
(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.
Token
Token
Cyclic data
Cyclic data
Cyclic data
Token
Message data
Token
Cyclic data
Message data
Token
Token
Cyclic data
Cyclic data
Message data
Содержание FL.NET
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Страница 33: ...2 FL NET MODULE ...
Страница 42: ...3 FL NET MODULE INSTALLATION ...
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Страница 225: ...8 APPENDIXES ...