Mitsubishi MELSEC Q Series Programming Manual page 760

WDT(P)
Operation Error
(1) There are no operation errors associated with the WDT(P) instruction.
Program Example
(1) The following program has a watchdog timer setting of 200 ms, when due to the execution
conditions program execution requires 300 ms from step 0 to the END (FEND) instruction.
7-386
[When WDT instruction is used]
Program where
scan time is
300 ms.
END
Program where
scan time is
150 ms.
WDT
Program where
scan time is
150 ms.
END