![background image](http://html.mh-extra.com/html/omron/c200hw-clk21/c200hw-clk21_operation-manual_742483283.webp)
258
Data Link I/O Response Time
Section 8-3
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
page 258).
CS/CJ-series PLCs, CVM1
and CV-series PLCs in
Synchronous Mode,
CQM1H-series PLCs, and
C200HX/HG/HE PLCs
When a CS/CJ-series, CQM1H-series, CVM1, or CV-series PLC is operating
in synchronous mode, a CQM1H-series, or a C200HX/HG/HE PLC is operat-
ing, data exchange with the Controller Link Unit is executed as processing
during peripheral processing for the PLC cycle. Data exchange timing is as
follows:
If processing for data exchange is executed, the PLC cycle time will be length-
ened by the time required for the interrupt processing (see
below).
8-3-2
Data Processing Time
The time required to process data exchange (data processing time) can be
roughly estimated as shown in the following table.
The number of words processed in a single data exchange is shown in the fol-
lowing table for each series of PLC. If the number of data link words exceeds
the value shown in the table, data exchange will be executed as several sepa-
rate processes.
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
PLC cycle time
Execution
PLC processing
Basic processing
Execution
I/O refreshing
Basic processing
Processing for
data exchange
Peripheral
service
CPU Unit
Equation estimating data processing time
CS1-H, CJ1-H, CJ1M CPU Unit
0.1 ms + Number of transfer words
×
0.7
µ
s
CS1, CJ1 CPU Unit
1.5 ms + Number of transfer words
×
1
µ
s
CVM1-series CPU Unit
1.7 ms + Number of transfer words
×
1
µ
s
Summary of Contents for C200HW-CLK21
Page 3: ...iv ...
Page 9: ...x ...
Page 12: ...xiii TABLE OF CONTENTS Index 367 Revision History 373 ...
Page 13: ...xiv ...
Page 19: ...xx ...
Page 57: ...32 Application Precautions Section 1 5 Example CX Programmer Response Timeout Setting ...
Page 69: ...44 Message Service Procedure Section 2 2 ...
Page 111: ...86 Constructing Networks with Repeater Units Section 3 4 ...
Page 154: ...129 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Page 261: ...236 Response Codes Section 6 7 ...
Page 297: ...272 Message Delay Times Section 8 4 ...
Page 353: ...328 Handling Precautions Section 9 6 ...
Page 364: ...339 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 365: ...340 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Page 369: ...344 Standard Models Appendix A ...
Page 391: ...366 Using the Relay Terminal Block Appendix C ...
Page 397: ...372 Index ...
Page 401: ...376 Revision History ...