Mitsubishi MELSEC-A Series Programming Manual page 476

APPENDICES
POINTS
(1) "When not executed" in the above table indicates that the input condition is
off.
Input condition
(2) "When not counted" of OUT C instruction indicates that the input condition
remains on and the counter does not count.
(3) "OFF" of PLS and PLF instructions indicates that the input condition
remains on 1 scan after it has turned on (off for PLF), and the pulse is not
generated.
(4) T/C count processing time and refresh time are not included in the FEND,
END, CHG instruction processing times.
APP − 71
MELSEC-A