4-11 Data Link Characteristics; 4-11-1 Data Link Communications Cycle Time - Omron CS1W-SLK11-21 - 06-2004 Manual

Data Link Characteristics
Adding a Node to a Data Link

4-11 Data Link Characteristics

4-11-1 Data Link Communications Cycle Time

Automatic Generation
62
Node 1
CIO Area
1000
1000
1
1010 1010
2
1020
1020
3
1030
1030
4
1039
1039
The number of send words for node 4 is set as 20 words in the common link
parameters, but the number of send words is set as 10 words in the common
link parameters for other nodes that are already operating. Consequently,
node 4 will not participate in the data link network.
Data link servicing is given priority in SYSMAC LINK Systems. The communi-
cations time for a data link can thus be maintained as a constant, regardless
of whether or not SEND(90), RECV(98), and CMND(490) are used. Fixing the
data link communications time at a constant value fixes the data link I/O
response time as well.
The communications cycle time can be set either automatically (the default) or
controlled externally.
When data link tables have been generated automatically, the communica-
tions time will be as follows for systems using coaxial cable:
No. of nodes
2 19 ms
4 19 ms
8 19 ms
16 19 ms
The communications time will be as follows for systems using optical fiber
cable:
No. of nodes
2 21 ms
4 22 ms
8 22 ms
16 22 ms
Node 2
Startup node
CIO Area
1000
1
1010
2
1020
3
1030
4
1039
Data link areas
CIO and DM Areas CIO Area only
17 ms
17 ms
18 ms
18 ms
Data link areas
CIO and DM Areas CIO Area only
20 ms
20 ms
21 ms
21 ms
Section 4-11
Node 3 Node 4
Participating nodes
CIO Area
CIO Area
1000
1
1
1010
2 2
1020
3 3
1030
4
4
1049
DM Area only
18 ms
18 ms
18 ms
19 ms
DM Area only
21 ms
21 ms
21 ms
22 ms