Omron SYSMAC CPM2B-S001M-DRT Operation Manual page 33

Structure and Operation
20
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When IORF(97) is used, the cycle time is extended by the time required to
refresh the specified I/O words.
Overseeing processes
Cycle
time
RS-232C port servicing
Peripheral port servicing
Main program
IORF(97) executed.
Immediate refreshing
I/O refreshing
I/O refreshing
Section 1-3