Mitsubishi Electric MELSEC-Q00U(J)CPU

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2.10.4 Fixed scan execution type program
Fixed scan execution type program is a program executed at specified time intervals. This type of programs, unlike
interrupt programs, can be interrupted in units of files without interrupt pointers or the IRET instruction. For the
restrictions on programming, refer to Page 84, Section 2.9 (1) (b). (The restrictions on programming are the same as
those for interrupt programs.)
To execute a fixed scan execution type program, execute the EI instruction in the initial execution type program or scan
execution type program to enable interrupts.
Fixed scan interval
END processing
Scan execution
type program
Fixed scan execution
type program
Condition
established
Condition
established