Network Management; Masterless Transmission Management - ProSoft MVI56E-FLN User Manual

MVI56E-FLN ♦ ControlLogix Platform
FA Control Network Ethernet Communication Module

4.4.8 Network Management


Nodes can be added while the FL-net system is running.

The system will continue to run even if any node fails.

Each node knows the state of all the other nodes.
Each node manages In-ring and Out-ring of nodes

One token is circulated between all nodes in the FL-net and the token is
monitored by the time of each node. If a node does not send the token, the
next node will reissue it after a fixed time interval.

Out-ring management
If a node does not send the token, every node will recognize the node failure.

In-ring management
New node sends a participation request frame and every node monitors it.

Node state management
Network status and upper layer status are attached in the cyclic frame.

4.4.9 Masterless Transmission Management

Token
1 A node can transmit data only while holding a token, with the following two
exceptions:

Reissue of token due to failure of a node to send a token within the token
monitoring time

Transmission of participation request frame when the node has not joined in
the network
1 A single token is circulated among nodes. A node receiving a token holds the
transmission right until it releases the token to the next node.
2 The token is circulated between all the nodes joining the FL-net.
3 The token can be transmitted along with cyclic data.
4 The token can also be circulated without any data.
5 The token is monitored by each node's timer. If the token is not released by a
node within a fixed time, the token is automatically reissued.
6 If there are two tokens in the network, they are combined into one.
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Reference
User Manual
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