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266
Message Delay Times
Section 8-4
Note
This communications cycle time is calculated assuming that there is no node
that transmits event frames before the SEND command is sent.
RECV Instruction
Maximum Delay Time
The data flow which will yield the maximum transfer interval from the time the
RECV(193)/RECV(98) instruction is executed by the user program to the time
the Controller Link Unit stores the data in the local Unit’s memory area is
described below.
Note
Be sure to take into account the time required for data links and program exe-
cution, which are not included in the following example.
Max. transmission delay = Link servicing interval (source node) + Link service
processing (source node) + Transmission processing (command) + Communi-
cations cycle + Transmission delay (command) + Reception processing (com-
mand) + Link servicing interval (destination node) + Link service processing
(destination node) + Transmission processing (response) + Communications
cycle + Transmission delay (response) + Reception processing (response) +
Link servicing interval (source node) + Link service processing (source node).
Link servicing interval (source node)
PLC cycle time (source node)
Link service processing (source node)
1 ms
Transmission processing
0.00075
×
256 + 2 = 2.192
≅
2.2 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
0.008
×
256 + 0.112 = 2.16
≅
2.2 ms
Reception processing
0.00075
×
256 + 1.13 = 1.492
≅
1.5 ms
Link servicing interval (destination node)
As required by Programming
Device
Link service processing (destination node)
1 ms
Total (max. transmission delay)
PLC cycle time (source node) +
Peripheral servicing interval
(destination node) + 16.1 ms
RECV (193)/RECV(98)
executed
Data stored
Link service interval (source node)
Transmission processing (command)
Reception processing (response)
Communications cycle
Reception processing (command)
Link service interval (destination mode)
Transmission delay (command)
Link service processing (source node)
Transmission delay (response)
Transmission processing (response)
Link service processing (destination node)
Maximum transmission delay
Link service processing (source node)
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 ...