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CHAPTER2 SEQUENCE PROGRAMS
2
3
2.3 Settings When Progr
am is Divided
2.3.5 F
ixed scan execution type pr
ogram
2.3.5 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)(b).
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.
Figure 2.38 Execution of a fixed scan execution type program
Fixed scan interval
END processing
Scan execution
type program
Fixed scan execution
type program
Condition
established
Condition
established