Omron CJ1W-FLN22, Operation Manual, Page: 93 / 277

67
Data Link Overview Section 5-1
tion with the upper layer. When a node receives cyclic data in multiple
frames, the area is refreshed as soon as all the frames being transmitted
by the one node have been received. If all the frames that were transmitting
the fragmented data from the node are not received, all the data that was
transmitted from the node is discarded.
5-1-2 Data Link Specifications
The memory used in common by nodes executing cyclic transmission is
called “Common Memory.” The FL-net Unit has 8,704 words of Common
Memory (including Area 1 and Area 2).
Note 1. The data for Area 1 and Area 2 from the same node will be refreshed in the
same CPU Unit cycle or Area 2 will be refreshed first. If concurrency is re-
Transmission
area
Transmission
buffer
Common
memory
Batch copy
Transmitting
node
Network
circuit
Cyclic data
Cyclic data
Cyclic data
Receiving node
Common
memory
Receiving
area
Receiving
buffer
Batch copy
Item Specifications
Number of
nodes 128 nodes max.
Number of data
blocks Two areas max. per node (Area 1 and Area 2)
Total Data Link
capacity 8,704 words max.
• Area 1 (bit area): 512 words
• Area 2 (word area): 8,192 words
Areas that can
be allocated • CIO (I/O bits, etc.): CIO 0 to CIO 6143
• Work Area: W0 to W511
• HR Area: H0 to H511
• DM Area: D0 to D32,767
• EM Area: Bank 0 to 12, E0 to E32,767
Unit of data
exchange Words
Data configura-
tion The following diagram shows the configuration of one word of data.
MSB LSB
Word D15 D0