Omron CS1W-RPT01 Manuale Utente
257
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
response time will be cycle time of PLC at node #7
×
4.
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.
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
Cycle time of PLC at node #7
×
(3+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:
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.
Case 2
The following diagram illustrates the data flow that will produce the maximum
data link I/O response time when the cycle time of the PLC at node #1
data link I/O response time when the cycle time of the PLC at node #1
≥
the
communications cycle time and the cycle time of the PLC at node #7 < the
communications cycle time.
communications cycle time.
Input ON delay
1.5 ms
Cycle time of PLC at node #1
×
2
15 ms
×
2
Communications cycle time
×
3
9.9 ms
×
3
PLC cycle time at node #7
×
3 (See note.)
20 ms
×
3 (See note.)
Output ON delay
15 ms
Total (data link I/O response time)
136.2 ms