Omron SYSMAC CJ1W-EIP21 - Manual (Page 304)

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Adjusting the Communications Load Section 10-2
Changing the
Settings Method 1: Same Packet Interval Setting for All Connections
The percentage of the allowed tag data link bandwidth being used (Usage of
Capacity) was 39.67% with the RPI set to 10.0 ms for all of the connections,
so the RPI will be set to 5.0 ms, with a target of 80% or less of the allowable
bandwidth.
Click the Set Packet Interval (RPI) Button at the bottom of the Usage of
Device Bandwidth Dialog Box. The Set Packet Interval (RPI) Dialog Box will
be displayed. Input 5.0 ms as the new RPI value, and click the OK Button.