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Message Delay Times
Section 8-4
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
CVM1 and CV-series PLCs Operation Manual:
Ladder Diagrams
(W202) 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
Commands: 2 ms
Responses:
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.
Note
Commands: Transmission delay time is calculated assuming that the number
of words to be transferred is zero.
Responses: Transmission delay time is calculated according to the number of
words to be transferred.
Reception Processing
Commands: 1.3 ms
Responses:
Number of words transferred
×
0.00075 ms + 2 ms
The I/O response time can increase due to noise or restrictions on the number
of frames that can be transmitted while the data link is operating.
Example
In this example, the maximum transmission delay is calculated for an instruc-
tion receiving 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
×
0.08 + 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
Содержание C200HW-CLK21
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Страница 12: ...xiii TABLE OF CONTENTS Index 367 Revision History 373 ...
Страница 13: ...xiv ...
Страница 19: ...xx ...
Страница 57: ...32 Application Precautions Section 1 5 Example CX Programmer Response Timeout Setting ...
Страница 69: ...44 Message Service Procedure Section 2 2 ...
Страница 111: ...86 Constructing Networks with Repeater Units Section 3 4 ...
Страница 154: ...129 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Страница 261: ...236 Response Codes Section 6 7 ...
Страница 297: ...272 Message Delay Times Section 8 4 ...
Страница 353: ...328 Handling Precautions Section 9 6 ...
Страница 364: ...339 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Страница 365: ...340 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Страница 369: ...344 Standard Models Appendix A ...
Страница 391: ...366 Using the Relay Terminal Block Appendix C ...
Страница 397: ...372 Index ...
Страница 401: ...376 Revision History ...