Omron SYSMAC CS Series Operation Manual page 415

Explanations of PLC Setup Settings
Special I/O Unit Cyclic Refreshing
When a Special I/O Unit will be refreshed in an interrupt task by IORF(097),
always disable cyclic refreshing for that Unit with this setting. The expected
results will not be achieved and the Interrupt Task Error Flag (A40213) will be
turned ON if IORF(097) is executed in an interrupt task during normal I/O
refreshing.
Special I/O Unit CPU Unit
Special
I/O Unit
Area
These settings determine whether or not
data will be exchanged with the 10 words
allocated to each Special I/O Unit in the
Special I/O Unit Area during cyclic I/O
refreshing.
Section 7-2
377