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MELSEC-Q/QnA
3 CONFIGURATION OF INSTRUCTIONS
(3) PLS instructions using the same device
The PLS instruction turns ON the specified device when the PLS command turns ON from
OFF. It turns OFF the specified device at any other time (OFF
OFF, ON ON, and ON
OFF).
When two or more PLS instructions using the same device are programmed in one scan, each
PLS instruction turns ON the specified device when the corresponding PLS command turns
ON from OFF and it turns OFF the specified device at any other time.
For this reason, when two or more PLS instructions using the same device are programmed in
one scan, the device that has been turned ON by the PLS command may not turn ON again
throughout the scan.
[Circuit]
M0
X0
X1
PLS
M0
PLS
[Timing Chart]
• The ON/OFF timing of the X0 and X1 is different. (The specified device does not turn ON
throughout the scan.)
M0
M0 turns ON because X1
turns ON from OFF.
OFF
ON
END
END
END
X0
X1
M0
OFF
OFF
ON
PLS
X0
X1
M0
PLS
M0
PLS
M0PLS
X0
X1
ON
M0 turns OFF because X0 is not turning
ON from OFF. (M0 stays OFF.)
M0 turns OFF because
X1 is not turning ON from OFF.
M0 turns ON because X0 turns
ON from OFF.
• The X0 and X1 turn ON from OFF at the same time.
M0
OFF
ON
END
END END
X0
X1
M0
OFF
OFF
ON
PLS
X0
X1
M0PLS
M0PLS
M0PLS
X0
X1
M0 turns ON because X1 turns
ON from OFF. (M0 stays ON.)
M0 turns OFF because X1 is
not turning ON from OFF.
(M0 stays OFF.)
M0 turns OFF because X0
is not turning ON from OFF.
M0 turns ON because
X0 turns ON from OFF.
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