Mitsubishi MELSEC-A Series Programming Manual page 93

5. SEQUENCE INSTRUCTIONS
(2) If the instruction generating the pulse is switched on and the RUN key switch is
moved from the RUN to STOP position and the RUN key switch is moved from
the RUN to STOP position and then returned to the RUN position again, the PLS
instruction is not executed.
X000
PLS
0
END
ON
X0 OFF
M0 OFF
(3) When a latch relay (L) is specified in a PLS instruction execution command, after
the power goes Off with the latch relay (L) in the On state, when the power is
turned On again, the PLS command executes the PLS command so that it will
change from Off to On in the first scan and turn the specified device On. After
the power goes On, the device which was turned On in the first scan goes Off
when the next PLS instruction is executed.
PLF
(1) When the PLF command changes from On to Off, the specified device goes On
for 1 scan and when the PLF command is in a state other than On → Off (Off →
Off, Off → On, On → On), the device goes Off.
If there is one PLF instruction from the specified device (D) within 1 scan, the
specified device goes On for 1 scan.
See Section 3.9 concerning operation in the case that the PLF instruction from
the same device is executed multiple times in 1 scan.
X005
PLF
(2) If the instruction generating the pulse is off and the RUN key switch is moved
from the RUN to STOP position and then returned to the RUN position again,
the PLF instruction is not executed.
Move RUN key switch
of CPU unit from
M0
RUN to STOP position
LD X0
PLS M0
END
Operation stop
time of PC
ON
1scan of PLS M0
M0
X5 OFF
M0 OFF
5 − 24
Move RUN key switch
of CPU unit from
STOP to RUN position
LD X0
PLS M0
END 0
Operation stop time
of PC
ON
ON
1 scan
MELSEC-A
LD X0
PLS M0
1 scan