Scan Execution Type Program; Fixed Scan Execution Type Program - Mitsubishi Electric MELSEC iQ-F FX5 User Manual

Scan execution type program

This program type is executed only once per scan from the scan following the scan where an initial execution type program
was executed.
STOP/PAUSE→RUN
END processing
Initial execution type program
Scan execution type program A
Scan execution type program B
Scan execution type program C
When multiple scan execution type programs are executed, the execution time of the scan execution type programs becomes
the time until execution of all scan execution type programs is completed. Note, however, that when an program/event
execution type program is executed before a scan execution type program is completed, the execution time of these
programs is included in the scan time.

Fixed scan execution type program

An interrupt program which is executed at a specified time interval. Different from the normal interrupt program, this type of
program does not require interrupt pointer (I) and IRET instruction to be written (pointer is assigned by parameter). Execution
is performed by program file basis.
You can use 4 files of fixed scan execution type programs at the maximum.
Fixed scan interval
END processing
Scan execution type program
Fixed scan execution type program
To execute a fixed scan execution type program, the EI instruction must be used to enable interrupts.
1st scan 2nd scan
0 END
0 END
Scan time
Condition
established
3rd scan
0 END
0 END
0 END
Condition
established
1.4 Execution Type of Program
4th scan
0 END
0
END
1 PROGRAM EXECUTION
1
21