Mitsubishi Electric 700 Series Programming Manual page 135

Sequence Instructions
PLF
(1) Turns the specified device on one scan when the PLF command turns from ON to
OFF, and turns it off except when the PLF command turns from ON to OFF.
When there is one PLF instruction for the device specified at
the specified device turns on for one scan.
Do not execute the PLF instruction for the same device more than once during
one scan.
(2) If the status is switched to STOP and switched to RUN again after execution of
the PLF instruction, the PLF instruction is not executed.
Program Examples
PLS
Program that executes the PLS instruction when X9 turns on.
PLF
Program that executes the PLF instruction when X9 turns off.
130
1 scan
D
・ Coding
・ Coding
1 scan
during one scan,
1 scan
1 scan