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190
Data Link I/O Response Time
Section 9-3
Network configuration:
8 nodes
Nodes that send messages:
2 nodes
Bytes in all messages sent:
2,012
×
2 bytes
In this example, A to D in the equation have the following values.
A: 4; B: 2; C: 8; D: 7
×
8
The maximum communications cycle delay in token-ring mode would be as
follows:
(4
×
4 + 2
×
2 + 1)
×
(3
×
8 + 7
×
8) = 1,680 (
µ
s)
≅
1.7 (ms)
The rate of change in the communications cycle time when data links are
active would be as follows (refer to 9-2-1 Active Data Links):
(111 + 1.7)/111
×
100
≅
101.5 (%)
The rate of change in the communications cycle time when data links are
inactive would be as follows (refer to 9-2-2 Inactive Data Links):
(32 + 1.7)/32
×
100
≅
105.3 (%)
9-3
Data Link I/O Response Time
When accurate communications timing is required, you need to understand
data exchange timing and the time required for data transmission and recep-
tion via data links. Use the information described in this section as reference
information for system construction.
9-3-1
Data Exchange Timing
This section describes data exchange timing for data links between the Con-
troller Link Unit and the PLC’s CPU Unit. Data exchange is executed as inter-
rupt processing during CPU Bus Unit or Programming Device/Host Link
servicing performed by the CPU Unit. This interrupt processing is executed
each time data exchange between the local node and each node connected
via a data link is completed.
Data exchange timing differs depending on the CPU Unit model and the CPU
Unit the Execute Process (asynchronous or synchronous) specified in PLC
Setup, as described below.
CVM1 and CV-series PLCs
Under Asynchronous
Operation
When a CVM1 or CV-series CPU Unit is operating in asynchronous mode,
data exchange with the Controller Link Unit is executed as interrupt process-
ing during peripheral processing, regardless of the cycle time of PLC instruc-
tion execution. Data exchange timing is as follows:
More than one data exchange can be executed during a PLC cycle, depend-
ing on the data exchange timing. If interrupt processing for data exchange is
executed, the peripheral servicing interval will be lengthened by the time
required for the interrupt processing (see 9-3-2 Data Processing Time on
page 191).
Instruction execution
PLC cycle time
Execution
I/O refreshing
PLC processing
Peripheral processing
Peripheral servicing interval
Basic processing
CPU Bus
Unit service
Programming
Device/Host Link
service
Interrupt processing
for data exchange
Execution
Execution
I/O refreshing
I/O refreshing
Interrupt processing
for data exchange
Interrupt processing
for data exchange
Basic processing
CPU Bus
Unit service
Programming
Device/Host Link
service
CPU Bus
Unit service
Programming
Device/Host Link
service
Basic processing
Содержание CS1W-CLK12-V1
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Страница 9: ...x TABLE OF CONTENTS ...
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Страница 59: ...42 Component Names and Functions Section 3 1 Dimensions Unit mm ...
Страница 62: ...45 Component Names and Functions Section 3 1 Dimensions Unit mm ...
Страница 91: ...74 CVM1 and CV series Optical Ring Controller Link Units Section 4 2 ...
Страница 108: ...91 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Страница 125: ...108 Checking Data Link Status Section 5 4 ...
Страница 181: ...164 Setting Routing Tables Section 7 4 ...
Страница 199: ...182 Memory Areas Related to Duplex Operation Section 8 6 ...
Страница 275: ...258 Handling Precautions Section 10 7 ...
Страница 298: ...281 CS series Optical Bus Controller Link Units Appendix C Dimensions Unit mm 101 35 130 ...
Страница 299: ...282 CS series Optical Bus Controller Link Units Appendix C ...
Страница 311: ...Authorized Distributor Cat No W370 E1 03 Note Specifications subject to change without notice Printed in Japan ...
Страница 312: ...CS1W CLK12 V1 CVM1 CLK12 CS1W CLK52 V1 CVM1 CLK52 Optical Ring Controller Link Units Cat No W370 E1 03 OPERATION MANUAL ...