Mitsubishi MELSEC-A series, Programming Manual

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5. SEQUENCE INSTRUCTIONS
5
−
24
MELSEC-A
(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.
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.
(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.
X000
PLS M0
Move RUN key switch
of CPU unit from
RUN to STOP position Move RUN key switch
of CPU unit from
STOP to RUN position
X005
PLF M0
X5 OFF
M0 OFF
ON
ON
1 scan 1 scan
(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.
X0 OFF
M0 OFF
ON
PLS M0
LD X0
END
0
END PLS M0
LD X0
END
PLS M0
LD X0
0
ON
1scan of PLS M0
Operation stop time
of PC Operation stop
time of PC