Mitsubishi Electric MELSEC-Q00U(J)CPU User Manual page 102

(d) When the execution condition is established during END processing
When the execution condition is established during the constant scan execution or the waiting time of the END
instruction, a fixed scan execution type program is executed.
Constant scan
Fixed scan interval
END processing
Scan execution
type program
Fixed scan execution
type program
(2) Processing at program execution type change
For how to save and restore data in the index register when the program execution type is changed, refer to Page
87, Section 2.9 (3). (The method is the same as that for interrupt programs.)
100
*2
*1
Condition
established
*1 Waiting time
*2 If processing is not completed within the
waiting time, the scan time increases.