1 OVERVIEW
1.4 Precautions on Programming
37
1
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.
• If X0 and X1 differs in the on/off timing (i.e. the specified device does not turn on for one scan)
(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.
ON
ON
X1
X0
PLS M0
PLS M0
PLS M0
X1
X0
PLS
ON
OFF OFF
OFF
M0
X1
X0
END
END
END
ON
(1)
(2)
(3)
(4)
OFF OFF
M0
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