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271
Message Delay Times
Section 8-4
Reception Processing
Commands: 2.3 ms
Responses:
Number of words transferred
×
0.00125 ms + 2.3 ms
The I/O response time might increase due to noise or restrictions on the num-
ber 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 number:
32
Number of nodes:
32
Number of polled nodes: 4
Number of words:
256
Data links:
Halted
Note
This communications cycle time is calculated assuming that there is no node
that transmits event frames before the SEND command is executed.
Link Unit servicing (source node)
×
2
PLC cycle time (source node)
×
2
Transmission processing (command)
3 ms
Communications cycle time
×
2 (See note.)
(600
×
4 + 110
×
32 + 320
×
0 + 4
×
0 + 2,290)
×
2 = 8,210
µ
s
×
2
≅
16.4 ms
Transmission delay (command)
0.112
≅
0.1 ms
Reception processing (command)
2.3 ms
Link Unit servicing (destination node)
PLC cycle time (destination node)
Transmission processing (response)
0.00125
×
256 + 3 = 3.32
≅
3.3
Transmission delay (response)
0.008
×
256 + 0.112 = 2.16
≅
2.2
Reception processing (response)
0.00125
×
256 + 2.3 = 2.62
≅
2.6
Total (max. transmission delay)
PLC cycle time (source node)
×
2 + PLC cycle time (destination
node) + Peripheral servicing
time (destination node) +
29.9 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 ...