8 APPENDIXES
8-30
8.4.5 FL-net entering node management table
(1) Basic features
The status of nodes that have entered in the network is monitored with the management table
that each node has. This table handles on an individual node basis the data about nodes that
have entered in the network. The basic functions of this table are summarized below:
• A token frame is received at startup to update the entering node management table and
network management table.
• Upon each token frame reception, each node updates the entering node management table.
• Upon receipt of a new node’s enter request frame, the entering node management table is
updated.
• When a node’s token frame no-reception condition or timeout is detected three successive
times, the node is deleted from the table.
(2) Management data
The token of each node is constantly monitored to create and manage the entering node
management table.
Table 8-10 Entering Node Management Table
Item Length
Description
Node number
1 byte
1 to 254
Higher layer status
2 bytes
RUN/STOP/ALARM/WARNING/NORMAL
Area 1 data starting address for common memory
2 bytes
Word address (0 to 0x1FF)
Area 1 data size for common memory
2 bytes
Size (0 to 0x1FF)
Area 2 data starting address for common memory
2 bytes
Word address (0 to 0x1FFF)
Area 2 data size for common memory
2 bytes
Size (0 to 0x1FFF)
Refresh cycle time
2 bytes
Variable in 1 ms units
Token surveillance timeout
1 byte
Variable in 1 ms units
Minimum frame interval
1 byte
Variable in 100
µ
s units
FA link status
1 byte
Entering/leaving information, etc.
“0x1FFF” is a hexadecimal number (1FFF hex).
<Remark> Contained in a received token frame.
Содержание FL.NET
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