Omron SYSMAC CJ1W-EIP21 - Manual (Page 319)

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Tag Data Link Performance for CJ2M Built-in EtherNet/IP Ports Section 10-4
For example, the maximum and minimum I/O response times would be as fol-
lows for the above system.
Maximum response time:
1.5 ms + 5 ms
× 2 + 12 ms + 10 ms × 2 + 2.0 ms = 45.5 ms
Minimum response time:
1.5 ms + 5 ms + 10 ms + 2.0 ms = 18.5 ms
Note If the message service is used at the same time on the CJ2M built-in port, the
tag data link I/O response time will change.