8 APPENDIXES
8-27
Figure 8-19 Startup Timing Diagram 1
(b) Midway enter
If a node receives the token within the enter token detection time, it concludes that a link is
already established, and does not transmit an enter request frame until the token makes three
rounds. A frame received during such an interval is used to check for node number,
address, and other duplications and update the entering node management table. If an
address duplication is detected in such an instance, the common memory starting address and
common memory size of area 1 and 2 are set to 0 and cyclic data transmission does not take
place. When a node recognizes an address duplication, it sets an address multiplexing flag
and resets the common memory data validity notification flag. If the node number is
normal, the node transmits an enter request frame after an elapse of the enter request frame
transmission wait time. The enter request frame is sent no matter whether the token is held.
When a node recognizes a node number duplication, it does not transmit an enter request
frame and refrains from entering in the network.
Node monitoring started
(when the power is turned
ON or a reset is performed)
Enter request
frame
Trigger
Token
Node 1
Node 2
Node 3
Node 254
Enter token detection time (3 s)
Enter request frame transmission
wait time (node number
×
4 ms)
Enter request frame reception wait
time (1.2 s)
Содержание FL.NET
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Страница 29: ...1 OVERVIEW ...
Страница 33: ...2 FL NET MODULE ...
Страница 42: ...3 FL NET MODULE INSTALLATION ...
Страница 46: ...4 FL NET MODULE WIRING PROCEDURES ...
Страница 53: ...5 USER GUIDE ...
Страница 203: ...5 USER GUIDE 5 151 Sample printout ...
Страница 206: ...6 MAINTENANCE ...
Страница 210: ...7 TROUBLESHOOTING ...
Страница 225: ...8 APPENDIXES ...