Fixed Scan Execution Type Program - Mitsubishi Electric melsec q00ujcpu User Manual

2.3.4

Fixed scan execution type program

(1) Definition
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 Section 2.2.3(2)(d).
(The restrictions on programming are the same as those for interrupt programs.)
Fixed scan interval
END processing
Scan execution
type program
Fixed scan execution
type program
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.
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Figure 2.29 Execution of a fixed scan execution type program
Condition Condition
established established