Mitsubishi MELSEC Q Series Programming Manual page 762

DUTY
Program Example
(1) The following program turns SM420 ON for 1 scan, and OFF for 3 scans if X0 is ON.
[Ladder Mode]
[Operation]
X0
SM420
7-388
ON
OFF
ON
OFF
1 scan 3 scans
[List Mode]
Step Instruction Device