Omron SYSMAC CS1W-RPT01 Operation Manual page 286

Data Link I/O Response Time
Minimum Data Link I/O Response Time
12,000 to 15,600 (approx.) words: × 3
15,600 (approx.) to 20,000 words: × 4
If there is a node with more than 3,850 send words, however, the factors
become × 5 and × 6.
Noise may increase I/O delays.
Input
Input device
Input ON response time
1 cycle
Program
Data processing time
Data link transmission time
Data processing time
Program
Output ON response time
Data link I/O response time
The minimum data link I/O response time (i.e., the time that will not delay any
processing) can be calculated as follows:
Both the input ON response time and output ON response time are consid-
ered 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) + 0.1 = 0.124 ≅ 0.1 ms
Data Link transmission time:
The following formula is derived from the transmission speed (2 Mbits/s).
0.008 × Number of data link words (ms)
In this case, this gives the following result.
0.008 × (8 + 16) = 0.19 ≅ 0.2 ms
Cycle time of PLC at node #1
Data processing time
Data link transmission time
Data processing time
PLC cycle time at node #7
Total (data link I/O response time)
Note Noise may increase I/O delays.
I/O refresh
Data exchange
PLC at node #1
1 cycle
PLC at node #7
Output device
Output
25 ms
1.9 ms
0.2 ms
0.1 ms
10 ms
37.2 ms
Section 8-3
261