Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 202

Processing details
• This instruction turns on the specified device on the falling edge (on to off) of the execution command. When the execution
command is in another state (staying off, rising edge (off to on), or staying on), the instruction turns off the specified device.
If only one PLF instruction in the device specified by (d) is executed during one scan, the specified device turns on for one
scan. For the operation to be performed if more than one PLF instruction is executed during one scan, refer to the following.
Page 59 Operations arising when the OUT, SET/RST, and PLS/PLF instructions of the same device are used
X5
Sc: 1 scan
• Once after execution of the PLF instruction, even if the switch of the CPU module is moved to the STOP position and then
the RUN position again, the PLF instruction is not executed.
• The PLF instruction performs OFF processing at the execution of the next instruction after the instruction execution.
However, in safety programs executed by the Safety CPU, the PLF instruction turns on one safety cycle processing for the
specified device/label until the safety program of next safety cycle processing starts and the instruction is executed. If the
standard/safety shared label is used in the argument of the PLF instruction, the instruction may fail to detect the ON state of
the standard/safety shared label or may detect the ON state for plural periods in the safety program or standard program
that uses the corresponding standard/safety shared label depending on the timing to interrupt the safety cycle processing.
• Note that if the PLF instruction is jumped by using the CJ instruction or the executed subroutine program is
not called by using the CALL(P) instruction, the device specified by (d) may be on for more than one scan.
Operation error
There is no operation error.
5 SEQUENCE INSTRUCTIONS
200
5.3 Output Instructions
X5 OFF
PLF M0
M0 OFF
ON
ON
Sc Sc