Mitsubishi Electric MELSEC iQ-F FX5 Programming Manual page 43

If PLS instructions of the same device are used
The PLS instruction turns on the specified device when the execution command specifies an off-to-on change. The specified
device is turned off unless the execution command specifies an off-to-on change (i.e. off to off, on to on, on to off).
Thus, if two or more PLS instructions of the same device are issued during one scan, the specified device is turned on when
the execution command of each PLS instruction specifies an off-to-on change. The specified device is turned off unless the
execution command specifies an off-to-on change.
Thus, if two or more PLS instructions are issued during one scan, the device turned on by a PLS instruction may not turn on
for one scan.
X0
PLS
X1
PLS
• If X0 and X1 differs in the on/off timing (i.e. the specified device does not turn on for one scan)
END
ON
OFF
X0
X1
OFF
ON
OFF
M0
(1) Since X0 turns on, M0 turns on.
(2) Since X1 is other than turning on, M0 turns off.
(3) Since X0 is other than turning on, M0 remains off.
(4) Since X1 turns on, M0 turns on.
2.3 Operations Arising when the OUT, SET/RST, and PLS/PLF Instructions of the Same Device are Used
M0
M0
X0
PLS M0
X1
PLS M0
END
OFF
ON
OFF
(2)
(1)
X0
PLS M0
X1
PLS M0
END
ON
(4)
(3)
2 PRECAUTIONS ON PROGRAMMING
2
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