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187
Communications Cycle Time
Section 9-2
4.
Specify a value for the maximum node address that is equal to or greater
than the maximum node address in the Controller Link Network.
5.
For the CVM1 and CV-series PLCs, always set the System Protect Key
Switch on the CPU Unit to NORMAL. Otherwise, the network parameter
settings will not be stored normally.
9-2
Communications Cycle Time
This section describes how to calculate the communications cycle time.
9-2-1
Active Data Links
The following equations are used to calculate the communications cycle time
when data links are operating.
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)
Note 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 comm cycle
(value specified in the network parameters)
C: Number of nodes connected to the network
D: Number of nodes that send messages during the
communications cycle
E: Total number of bytes in messages transmitted during the
communications cycle
F: Optical Fiber Cable transmission delay time
H-PCF cable: F = 7
×
L
µ
s (L is the cable length in km.)
GI cable:F = 5
×
L
µ
s (L is the cable length in km.)
The number of bytes in each message differs according to the instruction
being issued, as shown in the following table.
Calculation Example
Communications conditions are as follows:
Transmission distance (with H-PCF cable):
8 km
Transmission speed:
2 Mbps (fixed)
Network parameters:
Defaults
Max node address:
62
Polled nodes per comm cycle:
4
Event-frames per comm cycle:
35
Network configuration:
8 nodes
Total number of data link words:
8,000 words
Nodes that send messages:
2 nodes
Bytes in all messages sent:
2,012
×
2 bytes
Instruction
When sent
When received
SEND
Number of words to be sent
×
2 +
18
14
RECV
18
Number of words to be received
×
2 + 14
CMND
Number of bytes in command data
+ 10
Number of bytes in response
data + 10
Summary of Contents for CS1W-CLK12-V1
Page 3: ...iv ...
Page 5: ...vi ...
Page 9: ...x TABLE OF CONTENTS ...
Page 11: ...xii ...
Page 59: ...42 Component Names and Functions Section 3 1 Dimensions Unit mm ...
Page 62: ...45 Component Names and Functions Section 3 1 Dimensions Unit mm ...
Page 91: ...74 CVM1 and CV series Optical Ring Controller Link Units Section 4 2 ...
Page 108: ...91 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Page 125: ...108 Checking Data Link Status Section 5 4 ...
Page 181: ...164 Setting Routing Tables Section 7 4 ...
Page 199: ...182 Memory Areas Related to Duplex Operation Section 8 6 ...
Page 275: ...258 Handling Precautions Section 10 7 ...
Page 298: ...281 CS series Optical Bus Controller Link Units Appendix C Dimensions Unit mm 101 35 130 ...
Page 299: ...282 CS series Optical Bus Controller Link Units Appendix C ...