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198
Message Delay Times
Section 9-4
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:
H-PCF cable used
Connection method:
Ring connection
Transmission distance:
8 km
Transmission speed:
2 Mbps
Max. node address:
62
Number of nodes:
62
Number of polled nodes per comm cycle:
4
Local node execution:
Synchronous
Remote node execution:
Asynchronous
Number of words:
256
Data link:
Inactive
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 (local node) + Link service
processing (local node) + Transmission processing (command) + Communi-
Link servicing interval (local node)
PLC cycle time (local node)
Link service processing (local node)
1 ms
Transmission processing
0.00075
×
256 + 2 = 2.192
≅
2.2 ms
Communications cycle time (See note.)
1,740
×
4 + 450
×
62 + 1,100
×
0 + 4
×
0
+ 2
×
7
×
8 + 3,000 = 37,972
µ
s
≅
38.0 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 (remote node)
As required by Programming Device
Link service processing (remote node)
1 ms
Total (max. transmission delay)
PLC cycle time (local node) + Periph-
eral servicing interval (remote node)
+ 45.9 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 CS1W-CLK12-V1
Page 3: ...iv ...
Page 5: ...vi ...
Page 9: ...x TABLE OF CONTENTS ...
Page 11: ...xii ...
Page 59: ...42 Component Names and Functions Section 3 1 Dimensions Unit mm ...
Page 62: ...45 Component Names and Functions Section 3 1 Dimensions Unit mm ...
Page 91: ...74 CVM1 and CV series Optical Ring Controller Link Units Section 4 2 ...
Page 108: ...91 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Page 125: ...108 Checking Data Link Status Section 5 4 ...
Page 181: ...164 Setting Routing Tables Section 7 4 ...
Page 199: ...182 Memory Areas Related to Duplex Operation Section 8 6 ...
Page 275: ...258 Handling Precautions Section 10 7 ...
Page 298: ...281 CS series Optical Bus Controller Link Units Appendix C Dimensions Unit mm 101 35 130 ...
Page 299: ...282 CS series Optical Bus Controller Link Units Appendix C ...