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263
Data Link I/O Response Time
Section 8-3
Assume that the peripheral servicing interval of the PLCs at nodes #1 and #7
is 10 ms. The equation for maximum data link I/O response time is as follows:
Note
If the total number of data link words is greater than the maximum number of
words that can be exchanged per data exchange, the maximum data link I/O
response time will be cycle time of PLC at node #7
×
3.
Noise may increase I/O delays.
Minimum Response Time
In this case, the data processing time required for data exchange and the data
transmission time are not negligible and need to be included in the calcula-
tion. Each time can be determined as follows.
Data Processing Time (see page 258.)
0.0025
×
(8 + 16)
×
8 + 4.7 = 5.18
≅
5.2 ms
Data Transmission Time
Data transmission time varies with the baud rate.
In this example, the number of data link words is (8 + 16)
×
8 = 192, so the
data transmission time can be determined as follows:
0.008
×
(8 + 16)
×
8 = 1.536
≅
1.5 ms
Input ON delay
1.5 ms
Cycle time of PLC at node #1
×
2
15 ms
×
2
Peripheral servicing interval of PLC at
node #1
10 ms
Communications cycle time
×
3
9.9 ms
×
3
Peripheral servicing interval of PLC at
node #7
×
2
10 ms
×
2
PLC cycle time at node #7
×
2 (See note.) 20 ms
×
2 (See note.)
Output ON delay
15 ms
Total (data link I/O response time)
146.2 ms
Baud rate
Data transmission time
2 Mbps
Number of data link words
×
0.008 ms
1 Mbps
Number of data link words
×
0.016 ms
500 Kbps
Number of data link words
×
0.032 ms
Input
Input device
Input ON delay
1 cycle
I/O refresh
PLC at node #1
PLC at node #7
Peripheral servicing interval
Peripheral servicing interval
Output device
Output
ON delay
Data link I/O response time
Program
◆
◆
Program
Data link transmission
Data processing time
Data processing time
Содержание C200HW-CLK21
Страница 3: ...iv ...
Страница 9: ...x ...
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 ...