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196
Message Delay Times
Section 9-4
Note Noise may increase I/O delays.
Minimum Data Link I/O Response Time
In this case, both the input ON response time and output ON response time
are considered negligible (0), but the data processing time required for data
exchange and the time required for the data transmission itself cannot be
ignored, so they are included in the total. The respective values are as follows:
Data processing time:
0.001
×
(8 + 16)
×
8 + 1.7 = 1.89
≅
1.9 ms
Data Link transmission time:
The following formula is derived based on the transmission speed.
0.008
×
(8 + 16) = 0.19
≅
0.2 ms
Assume that the sum of the instruction execution time and I/O refresh time for
the PLCs at nodes #1 and #7 is 1 ms. The equation for minimum data link I/O
response time is as follows:
Noise may increase I/O delays.
9-4
Message Delay Times
The two charts which follow indicate the sequence of processing which will
enable users to calculate the maximum delay time to be expected between
the time SEND(192/90) or RECV(193/98) is executed and the time the data is
stored in the remote or local node’s memory area, ready for use by other
instructions in the program.
9-4-1
CS-series, CVM1, and CV-series PLCs
SEND
The following diagram indicates the data flow which will yield the maximum
delay time from the time SEND(192)/SEND(90) is executed by the user pro-
gram to the time the Controller Link Unit stores the data in the remote Unit’s
memory.
Instruction execution time + I/O refresh time for PLC at node #1
1 ms
Data processing time
1.9 ms
Data link transmission time
0.2 ms
Data processing time
1.9 ms
Instruction execution time + I/O refresh time for PLC at node #7
1 ms
Total (data link I/O response time)
6.0 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
◆
Data link transmission
Data processing time
Data processing time
◆
Program
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 ...