265
Message Delay Times
Section 8-4
Max. transmission delay = Link Unit servicing interval (source node) + Link
service processing (source node) + Transmission proc Communica-
tions cycle time + Transmission delay + Reception proc Link Unit ser-
vicing interval (destination node) + Link service processing (destination node)
Link Servicing Interval (Source and Destination Nodes)
Link servicing depends on the execution mode of the PLC. The execution
modes on the source and destination modes need not be the same.
For synchronous execution, links are serviced once per PLC execution cycle.
For asynchronous execution, links are serviced according to the peripheral
servicing interval. Refer to the operation manual for the PLC for details. Refer
to the
CVM1 and CV-series PLCs Operation Manual: Ladder Diagrams
(W202) or
CS/CJ-series PLCs Instructions Reference Manual
(W340) for
details.
Link Service Processing (Source and Destination Nodes)
Link service processing is the same as the PLC’s peripheral servicing and is
approximately 1 ms for Controller Link Units.
Transmission Processing
Number of words transferred
×
0.00075 ms + 2 ms
Communications Cycle Time (with Data Links Inactive)
See
(on page 255).
Transmission Delay Time
Transmission delay time varies with the baud rate.
Reception Processing
Number of words transferred
×
0.00075 + 1.3 ms
Note
The I/O response time can increase due to noise or restrictions on the number
of frames that can be transmitted while data links are operating.
Example
In this example, the maximum transmission delay is calculated for an instruc-
tion sending 256 words of data in a system with 32 nodes. Network specifics
are detailed below:
Baud rate:
2 Mbps
Max. node address:
32
Number of nodes:
32
Number of polled nodes per comm cycle: 4
Source node execution:
Synchronous
Destination node execution:
Asynchronous
Number of words:
256
Data link:
Inactive
Baud rate
Transmission delay time
2 Mbps
Number of words transferred
×
0.008 + 0.112 ms
1 Mbps
Number of words transferred
×
0.016 + 0.224 ms
500 Kbps
Number of words transferred
×
0.032 + 0.448 ms
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 ...