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Data Link I/O Response Time Section 8-3
The equation for maximum data link I/O response time is as follows:
Note If the total number of data link words is greater than the maximum number of
words that can be exchanged per data exchange, the maximum data link I/O
response time will be cycle time of PLC at node #7
× 3.
In case of the CQM1H, however, the cycle time will be incremented by the
value obtained from dividing the total number of data link words by the maxi-
mum number of words (1,200 words) per time.
For example, if the total number of data link words is 5,000, the result will be
as shown below.
5,000/1,200 = 2.5 (approx. 3)
Cycle time of PLC at node #7
× (2+3)
The PLC cycle time when data link words exceed 12,000 using a CS/CJ-
series Controller Link Unit with unit version 1.2 or later is calculated as fol-
lows.
12,000 to 15,600 (approx.) words:
× 3
15,600 (approx.) to 20,000 words:
× 4
Noise may increase I/O delays.
Minimum Response Time
Input ON delay 1.5 ms
Cycle time of PLC at node #1 × 28 ms × 2
Communications cycle time × 4 9.9 ms × 4
PLC cycle time at node #7 × 2 (See note.) 8 ms × 2 (See note.)
Output ON delay 15 ms
Total (data link I/O response time) 88.1 ms
Input device
Program
Program
Input
Input ON delay
1 cycle
Output
Output device
Output ON
delay
1 cycle
Data link transmission
Controller Link Unit
transmission processing
PLC at node #7
PLC at node #1
Communications
cycle time
Data link I/O response time
I/O refresh
Data exchange