Omron NX-ECC201 User Manual page 224

10 I/O Refreshing
Additional Information
Refer to A-4 Connecting to Masters from Other Manufacturers on page A-9 for details on the
operation of I/O refreshing with connections that do not use the built-in EtherCAT port on the
NJ-series CPU Unit.
Primary Period Setting for Synchronous I/O Refreshing
If you use synchronous I/O refreshing in DC Mode to refresh I/O for EtherCAT Slave Terminals, the pro-
cess data communications cycle and NX bus refresh cycle are automatically synchronized with the pri-
mary period of the CPU Unit. However, the Sysmac Studio does not automatically set the primary
period. You must set the primary period manually. With the primary periodic task in Configurations and
Setup - Task Setup, select the task period in the Period/Execution Condition from the list.
Set the primary period so that it is longer than the NX bus refresh cycle that is automatically calculated
by the Sysmac Studio. If a primary period that is shorter than the NX bus refresh cycle is set, the syn-
chronous I/O refreshing will not operate.
A warning is given if you set the primary period to a value that is smaller than the NX bus refresh cycle
that is automatically calculated by the Sysmac Studio. A warning is displayed next to EtherCAT under
Configurations and Setup in the Multiview Explorer. If you place the cursor on the warning mark, the
required primary period is displayed. Set the primary period accordingly.
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NX-series EtherCAT Coupler Unit User's Manual (W519)