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3.9 Operation when the OUT, SET/RST, or PLS/PLF Instructions Use the Same Device
(3) PLS instructions using the same device
The PLS instruction turns ON the specified device when the execution command is turned
ON from OFF.
It turns OFF the device at any other time (OFF to OFF, ON to ON, or ON to OFF).
If two or more PLS instructions using the same device are executed in one scan, each
instruction turns ON the device when the corresponding execution command is turned ON
from OFF and turns OFF the device in other cases.
For this reason, if multiple PLS instructions using the same device are executed in a single
scan, a device that has been turned ON by the PLS instruction may not be turned ON during
one scan.
[Ladder]
[Timing Chart]
• The ON/OFF timing of the X0 and X1 is different. (The specified device does not turn ON
throughout the scan.)
M0
X0
X1
PLS
M0
PLS
M0
OFF
ON
END
END
END
X0
X1
M0
OFF
OFF
ON
PLS
X0
X1
M0PLS
M0PLS
M0PLS
X0
X1
ON
ON
M0 turns OFF because X1
status is other than OFF ON.
M0 turns ON because X1
goes ON (OFF ON).
M0 turns OFF because X0 status
is other than OFF ON.
(M0 remains OFF.)
M0 turns ON because
X0 goes ON (OFF ON).