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269
Message Delay Times
Section 8-4
Link Servicing Interval (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
Responses:
Number of words transferred
×
0.00125 ms + 3 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
Responses:
Number of words transferred
×
0.00125 ms + 2.3 ms
Note
The I/O response time can increase due to noise or restrictions on the number
of frames that can be transmitted while the data link is 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 number:
32
Number of nodes:
32
Number of polled nodes: 4
Number of words:
256
Data link:
halted
Note
This communications cycle time is calculated assuming that there is no node
that transmits event frames before the SEND command is issued.
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
Link Unit servicing (source node)
PLC cycle time (source node)
Transmission processing
0.00125
×
256 + 3 = 3.32
≅
3.3 ms
Communications cycle time (See note.)
600
×
4 + 110
×
32 + 320
×
0 + 4
×
0 + 2,290 = 8,210
µ
s
≅
8.2 ms
Transmission delay (command)
0.008
×
256 + 0.112 = 2.16
≅
2.2 ms
Reception processing
0.00125
×
256 + 2.3 = 2.62
≅
2.6 ms
Link servicing interval (destination node)
PLC cycle time (destination node)
Total (max. transmission delay)
PLC cycle time (source node)
×
2 + PLC cycle time (destination
node) + Peripheral servicing
time (destination node) +
16.3 ms
Содержание C200HW-CLK21
Страница 3: ...iv ...
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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 ...