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MELSEC-Q
4 SEQUENCE PROGRAM CONFIGURATION AND EXECUTION
CONDITIONS
(b) The low speed scan time is measured by the High Performance model
QCPU, and the result is stored in special registers (SD528 to SD535). 1
The low speed scan time can therefore be checked by monitoring the
SD528 to SD535 special registers.
Stores less than 1 ms low-speed scan time (unit s)
Stores the low-speed scan time in 1 ms units.
SD528
SD530
SD532
SD534
Current value
Initial value
Minimum value
Maximum value
SD529
SD531
SD533
SD535
If the SD528 value is 50, and the SD529 value is 400, the low speed scan
time is 50.4 ms.
POINT
1: The accuracy of the scan time stored at the special registers is ± 0.1 ms.
The scan time count will continue even if a watchdog time reset instruction
(WDT) is executed in the sequence program.
(7) Low speed execution monitor time
The execution time of the low speed execution type program can be monitored
by this timer. The default value is not set.
When monitoring the execution time of the low speed execution type program,
designate the low speed execution monitor time in a 10 to 2000 ms range at the
"PLC RAS" tab screen in the “(PLC) Parameter" dialog box. (Setting unit: 10 ms)
If the execution time of the low speed execution type program exceeds this timer
setting, a "PRG TIME OVER" error occurs.
POINT
The low speed execution time measurement occurs at low speed END processing.
Therefore a “PRG TIME OVER” error will occur if the low speed execution monitor
time (t) is designated as 100 ms, and the measured low speed scan time at low
speed END processing exceeds 100 ms.
Содержание QCPU (Q Mode)
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