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• The X0 and X1 turn ON from OFF at the same time.
END
ON
OFF
X0
ON
X1
OFF
OFF
M0
When specifying output (Y) in PLS instructions, the ON/OFF status of the device at the
execution of the last PLS instruction in the scan is returned as the output (Y).
(4) PLF instructions using the same device
The PLF instruction turns ON the specified device when the execution command is turned
OFF from ON.
It turns OFF the device at any other time (OFF to OFF, OFF to ON, or ON to ON).
If two or more PLF instructions using the same device are executed in one scan, each
instruction turns ON the device when the corresponding execution command is turned OFF
from ON and turns OFF the device in other cases.
For this reason, if multiple PLF instructions using the same device are executed in a single
scan, a device that has been turned ON by a PLF instruction may not be turn ON during one
scan.
[Circuit]
X0
X1
3.7 Operation when OUT, SET/RST, or PLS/PLF Instructions Use the Same Device
X0
PLS
M0
X1
PLS
M0
END
ON
M0 is turned ON because
X1 goes OFF
ON.
(M0 remains ON.)
M0 is turned ON because
X0 goes OFF
ON.
PLF
M0
PLF
M0
X0
PLS
M0
X1
PLS
M0
END
M0 is turned OFF
because X1 is other
than OFF
ON status.
(M0 remains OFF.)
M0 is turned OFF because X0 is other
than OFF
ON status.
3
3-17
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