Mitsubishi 00JCPU User Manual page 66

(4) Initial execution monitoring time setting
Initial execution monitoring time is a timer for monitoring initial scan time.
Set a time value in the PLC RAS tab of the PLC parameter dialog box.
The setting range is 10 to 2000ms (in increments of 10ms).
No default value is set.
(a) When the initial scan time exceeds the preset initial execution monitoring time
"WDT ERROR" occurs and the CPU module stops program operations.
Set a time value so that the initial execution monitoring time becomes longer than actual initial scan time.
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When an initial execution type program and low-speed execution type program are to be executed, the low-speed
execution type program (
Set a time value so that the initial execution monitoring time becomes longer than total execution time required for both
programs.
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An error of the measurement value is 10ms for the initial execution monitoring time setting.
If the initial execution monitoring time (t) parameter is set to 10ms, "WDT ERROR" occurs when actual initial scan time
is within the range of 10ms < t < 20ms.
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Figure 2.24 PLC RAS setting (Initial execution monitoring time)
Section 2.3.3) is executed after completion of the initial execution type program.