3. INSTRUCTION STRUCTURE
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MELSEC-A
• When the Off → On of X0 and X1 are the same timing.
M0
OFF
ON
END
END END
X0
X1
M0
OFF
OFF
ON
PLS
X0
X1
M0PLS
M0PLS
M0PLS
X0
X1
M0 goes On because X1 is Off
On. (M0 remains in the On state.)
M0 goes On because X0 is Off On.
M0 goes Off because X1 is
not Off On. (M0 remains
in the Off state.)
M0 goes Off because X0 is not Off On.
(4) If the PLF instruction is used from the same device.
The PLF instruction turns the specified device On when the PLF command goes
from On to Off, and when the PLF command is not going from Off to On (Off →
Off, Off → On, On → On) the specified device goes Off.
If the PLF instruction from the same device is executed multiple times in 1 scan,
the specified device goes On when the PLF command in each PLF instruction
goes from On to Off, and the specified device goes Off when the PLF command
is other than On → Off.
For this reason, if the PLF command from the same device is executed multiple
times in 1 scan, the device turned On by the PLF command may not go On in 1
scan.
[Circuit]
M0
X0
X1
PLF
M0
PLF
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