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3
SEQUENCE PROGRAM CONFIGURATION AND
EXECUTION CONDITIONS
3.3.2 Scan execution type
Basic
Note3.19
(1) Definition of scan execution type program
STOP
Power supply ON
END processing
Initial execution type program
Scan execution type program A
Scan execution type program B
Scan execution type program C
(2) Scan execution type program processing
Note19
Basic
The Basic model QCPU cannot use multiple scan execution type programs.
Refer to Section 3.2 for details of program execution in the Basic model QCPU.
Note3.19
programNote19
An scan execution type program is executed once for each scan, starting at the next
scan after execution of the initial execution type program.
RUN
RUN
1st scan
0
Diagram 3.25 Execution order of scan execution type programs
(a) Scan time
Scan time is the sum of the scan execution type program execution time and END
processing time.
1) Scan time storage places
The CPU module measures the current value and minimum and maximum
values of the scan time and stores them into the special registers (SD520,
SD521, SD524 to 527).
The scan time can be checked by monitoring SD520, SD521 and SD524 to
527.
Current value
SD520
Minimum value
SD524
Maximum value
SD526
Example : When SD520 is 3 and SD521 is 400, the scan time is 3.4ms.
3.3 Settings for Creation and Execution of Multiple Sequence Programs
2nd scan
END
0
END
0
END
0
END
Scan time
SD521
SD525
SD527
Stores scan time of 1ms or less (unit s).
Stores scan time in 1ms units.
Diagram 3.26 Scan time storage location
3.3.2 Scan execution type program
3rd scan
4th scan
0
END
0
END
0
0
END
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