Fl-Net Entering Node Management Table; Table 8-9 Entering Node Management Table - Hitachi FL.NET User Manual

8.2.5 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.
Node number
Higher layer status
Area 1 data starting address for common memory
Area 1 data size for common memory
Area 2 data starting address for common memory
Area 2 data size for common memory
Refresh cycle time
Token surveillance timeout
Minimum frame interval
FA link status
"0x1FFF" is a hexadecimal number (1FFF hex).
<Remark> Contained in a received token frame.

Table 8-9 Entering Node Management Table

Item Length
1 byte 1 to 254
2 bytes RUN/STOP/ALARM/WARNING/NORMAL
2 bytes Word address (0 to 0x1FF)
2 bytes Size (0 to 0x1FF)
2 bytes Word address (0 to 0x1FFF)
2 bytes Size (0 to 0x1FFF)
2 bytes Variable in 1 ms units
1 byte Variable in 1 ms units
1 byte Variable in 100 μs units
1 byte Entering/leaving information, etc.
8-17
8 APPENDIXES
Description