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Data Link I/O Response Time
Section 9-3
CVM1, CV-series, CS-series PLCs Under Synchronous Operation
Maximum Data Link I/O Response Time
There are three points shown in the diagram above where processing is
delayed, increasing the data link I/O response time.
1,2,3...
1.
The input arrives in the PLC just after I/O refreshing, causing a delay of up
to one cycle before the input is read into the PLC.
2.
Data exchange occurs just after the PLC at node #1 passes the token that
makes it the polling node, causing a delay of up to one communications cy-
cle time before the data is transferred in data link processing.
3.
At node #7, data from the previous data exchange is still being transferred,
causing a delay of up to one cycle before the input is read into the PLC. (If
the cycle time at node #7 is longer than the communications cycle time, the
processing will be delayed for two cycles.) Also, if the total number of data
link words exceeds the maximum number for a single exchange, the data
exchange will be divided up and there may be a delay of an additional cy-
cle.
The maximum number of words that can be exchanged in a single data ex-
change is approx. 7,800 words for CS-series PLCs and approx. 3,700
words for CVM1 and CV-series PLCs.
The equation for the maximum data link I/O response time is as follows:
Noise may increase I/O delays.
Input device
Program
Program
Input
Input ON delay
1 cycle
Output
Output device
Output ON delay
1 cycle
Communications
cycle time
Data link transmission
PLC at node #7
I/O refresh
Data exchange
PLC at node #1
Data link I/O response time
Input ON response time
1.5 ms
Cycle time of PLC at node #1
×
2
25 ms
×
2
Communications cycle time
×
2
22 ms
×
2
PLC cycle time at node #7
×
2
10 ms
×
2
Output ON response time
15 ms
Total (data link I/O response time)
130.5 ms
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 ...