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FL-net Network Control Appendix D
Participating in a New Network
If a token is not received within the entry token detection time, a trigger transmission is prepared and a trigger
is sent after dividing the node number by 8 and multiplying the remainder by 4 ms. If another trigger is received
before the trigger is sent, the trigger will not be sent. From the time the trigger is received and for the duration
of the participation request frame receive wait time (1,200 ms), the node number and address are checked for
duplication, the participating node management table is updated, and participation request frames from all
nodes are waited. The participation request frame is sent after the participation request frame send wait time
(node number
×
4 ms) times out after receiving the trigger. At this time, the beginning addresses of the Com-
mon Memories allocated for Area 1 and Area 2 and the Common Memory sizes are set to 0 and cyclic data is
not sent by nodes for which the participation request frames from other nodes show address duplication. The
Duplicate Common Memory Address Flag is turned ON for nodes confirmed to have duplicated addresses,
and the Common Memory Data Validity Notification Flag is turned OFF. When the participation request frame
receive wait time has lapsed, a token is sent first by the node with the smallest node number according to the
node management table. Nodes confirmed to have duplicate node numbers will not send or receive tokens or
data.
Joining an Active Network
When a token is received within the entry token detection time, the node assume links have been established
and waits for a participation request frame to be sent until the token has been passed three times around the
network. During that time, the node number and address are checked for duplication using the received
frames, and the participating node management table is updated. At this time, if a duplicate address is
detected, the beginning addresses of Common Memory Area 1 and Area 2, and the Common Memory size are
set to 0, and cyclic data is not sent. The Duplicate Common Memory Address Flag will turn ON for nodes that
are detected to have duplicate addresses, and the Common Memory Data Validity Notification Flag for the cor-
responding nodes will be turned OFF. If no node address error occurs, the participation request frame is sent
after the participation request frame send wait time lapses. The participation request frame is sent regardless
of whether the node is holding the token. The participation request frame will not be sent by nodes detected to
have duplicate node numbers and these nodes will not join the network.
Note The entry token detection time is the time required to check whether the network is active. A standard
cycle is based on the time taken for the token to be received at the node with the smallest node number.
The participation request frame send wait time is the time before a participation request frame can be
sent, so that the frame sent by the newly participating node does not collide with a frame being sent by
another node (local node number × 4 ms).
Token
Participation
request frame
Trigger
Node 1
Node 2
Node 3
Node 254
Entry token detection time (3 s)
Participation request frame
receive wait time (1 or 2 s)
Participation request frame
send wait time (node number
×
4 ms)
Node monitor starts
(when clearing reset after turning ON power)