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Chapter 15: Appendix
15
[5] FL-net Participating node management table
(1) Basic functions
The status of each node is monitored by the management table which each node keeps for itself.
This table handles the data used to control each node participating in the network. The operation is
outlined below.
When starting, it receives a token frame and refreshes the participating node management table
and network management table.
Each node refreshes its own participating node management table when it receives a token
frame.
Renews the participating node management table when receiving a participation request frame
of a new entry.
Delete any node that does not send a token frame or which times out three times in a row.
(2) Control data
The participating node management table contains data related to the nodes currently participating
in the network.
Participating node management table
- "0x1ff" is the hexadecimal notation for 1FF(HEX).
Note: This information is contained in the token frame received.
Item
Number
of bytes
Description
Node number 1 byte 1 to 254
Upper layer status 2 bytes RUN/STOP/ALARM/WARNING/NORMAL
Area 1 of common memory: Data top address 2 bytes Word address (0 to 0x1ff)
Area 1 of common memory: Data size 2 bytes Size (0 to 0x1ff)
Area 2 of common memory: Data top address 2 bytes Word address (0 to 0x1fff)
Area 2 of common memory: Data size 2 bytes Size (0 to 0x1fff)
Allowable refresh cycle time 2 bytes In units of 1 msec.
Token monitor time 1 byte In units of 1 msec.
Minimum separation of frames 1 byte In units of 100 µsec.
Link status 1 byte Participate/leave