Data Link Specifications - Omron CS1W-FLN22 Operation Manual

Data Link Overview
Common
memory
Transmitting
node
Network
circuit
Receiving node
Common
memory
5-1-2

Data Link Specifications

Note
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.
Transmission
area
Transmission
buffer
Cyclic data
Cyclic data
Cyclic data
Receiving
buffer
Receiving
area
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).
Item
Number of 128 nodes max.
nodes
Number of data Two areas max. per node (Area 1 and Area 2)
blocks
Total Data Link 8,704 words max.
capacity
• Area 1 (bit area): 512 words
• Area 2 (word area): 8,192 words
Areas that can • CIO (I/O bits, etc.): CIO 0 to CIO 6143
be allocated
• 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 Words
exchange
Data configura- The following diagram shows the configuration of one word of data.
tion
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-
Batch copy
Batch copy
Specifications
MSB
Word D15
Section 5-1
LSB
D0
67