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Omron CQM1H-CLK21 User Manual

Page 285

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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

×

2

8 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

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