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128
Communications Cycle Time
Section 8-2
8-1-4
Specifying Network Parameters
The network parameters can be specified from the Controller Link Support
Software. This section describes only the allowable setting range for each
network parameter. Refer to the
Controller Link Support Software Operation
Manual
(W308) for setting procedures.
The following table shows the setting range and default for network parame-
ters.
Note
The default value is 32 for Wired Controller Link Support Boards and 62 for
Optical Ring Controller Link Support Boards.
The network parameters become valid immediately after being set.
Note
1. Always stop the data link before changing network parameters.
2. Specify a value for the maximum node address that is equal to or greater
than the maximum node address in the Controller Link Network.
8-2
Communications Cycle Time
This section describes how to calculate the communications cycle time. When
accurate timing is required, it is necessary to understand the time required for
sending and receiving data link data and the timing for exchanging data.
8-2-1
Active Data Links
The following equations are used to calculate the communications cycle time
when data links are operating. (The communications cycle time will vary
somewhat depending on the baud rate and the conditions at that particular
time.)
Wired Networks
Optical Networks
Note
The meanings of the variables in the above formulas are as follows:
A: Total number of data link words within the network
(total number of words in send areas of all nodes)
B: Number of polled nodes per communications cycle
(value specified in the network parameters)
C: Number of nodes connected to the network
Network parameter
Setting range
Default value
Maximum node address
2 to 62
62 (See note 1.)
Number of polled nodes per communica-
tions cycle
1 to 61 (See note
2.)
4
No. of event-frames per communications
cycle
16 to 238
35
Baud rate
Equation
2 Mbps
10
×
A + 600
×
B + 290
×
C + 320
×
D + 4
×
E + 3,290 (
μ
s)
1 Mbps
18
×
A + 1,150
×
B + 370
×
C + 360
×
D + 8
×
E + 3,770 (
μ
s)
500 Kbps
34
×
A + 2,260
×
B + 530
×
C + 440
×
D + 16
×
E + 4,730 (
μ
s)
Baud rate
Equation
2 Mbps
(Fixed)
Token Ring Mode
9.1
×
A + 1,740
×
B + 960
×
C + 1,100
×
D + 4
×
E + 2
×
F+ 4,800 (
μ
s)
Token Bus Mode
9.1
×
A + 1,300
×
B + 290
×
C + 320
×
D + 4
×
E + 2
×
F+ 2,290 (
μ
s)
Summary of Contents for SYSMAC 3G8F7-CLK12-EV1
Page 2: ......
Page 4: ...iv ...
Page 20: ...xx Conformance to EC Directives 6 ...
Page 48: ...28 Applications Precautions Section 1 4 Example CX Programmer Response Timeout Setting ...
Page 68: ...48 Backup Power Supply Wiring Optical Ring Systems Only Section 2 4 ...
Page 74: ...54 Using the C Library Section 3 2 ...
Page 110: ...90 Changing the Data Link Tables with Active Data Links Section 5 5 ...
Page 187: ......