Omron FH series User Manual page 217

EtherNet/IP Communications Cycle (RPI)
Data is refreshed for EtherNet/IP tag data link communications at a communications interval called the RPI
(requested packet interval).
All data transfer between the external device (e.g., PLC) and the Sensor Controller are performed at the set RPI.
PLC
Communications
RPI
transmission path
(EtherNet/IP)
Output signal
from the Sensor
Controller
ON
OFF
Sensor Controller
Signal changes from the Sensor Controller are affected by the RPI. In some cases the target device may not
detect a change in the ON/OFF status of a signal depending on the RPI timing.
Therefore, you must set up the RPI and output signals from the Sensor Controller so that they satisfy the
following relationship:
Duration of change in Sensor Controller signal > RPI
IMPORTANT
Set the RPI to 4 ms or higher.
If the RPI is longer than the duration of a Sensor Controller signal change, the signal change may not be
detected.
Example 1: Duration of Change in Sensor Controller Signal < RPI
RPI
Sensor Controller
PLC
Communications
transmission path
(EtherNet/IP)
Output signal
from the Sensor
Controller
OFF
Sensor Controller
The PLC cannot detect some of the output signals from the Sensor Controller.
Vision System FH/FZ5 Series User's Manual
for Communications Settings (Z342)
Data is updated at the set
RPI
packet interval (RPI).
Output period
Output time
Output control
30 ms 30 ms 30 ms
ON
30 ms 30 ms
50 ms 50 ms
30 ms
50 ms
30 ms (ON: 30 ms, OFF: 20 ms)
None
The packet interval (RPI) is too long.
Communicating with EtherNet/IP
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