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5 SEQUENCE INSTRUCTIONS
5.3 Output Instructions
Falling edge output
PLF
This instruction turns ON the device specified by (d) for one scan when the PLF command turns from ON to OFF, and turns
OFF in other cases.
■Descriptions, ranges, and data types
■Applicable devices
*1 Only the FX5 series intelligent function module can be used.
*2 T, ST, C cannot be used.
• This instruction turns ON the specified device for one scan when the PLF command turns OFF from ON, and turns OFF in
other cases. When there is one PLF instruction programmed for the device specified by (d) during a scan, the specified
device turns ON for one scan.
• If the RUN/STOP/RESET switch is changed from RUN to STOP after execution of the PLF instruction, the PLF instruction
will not be executed even if the switch is set to RUN again.
• When write during RUN is completed for a circuit including a falling edge instruction (LDF/ANDF/ORF instruction), the
instruction is not executed regardless of the ON/OFF status of the target device of the falling edge instruction. Also, in the
case of a falling edge instruction (PLF instruction), the instruction is not executed regardless of the ON/OFF status of the
device that is set as the operation condition. The instruction is executed when the target device and the device in the
operation conditions is set from ON to OFF again.
• Note that the device specified by (d) sometimes turns ON for one scan or more when the PLF instruction is made to jump
by the CJ instruction or the executed subroutine program was not called by the CALL(P) instruction.
There is no operation error.
Ladder diagram Structured text
ENO:=PLF(EN,d);
Operand Remarks Range Data type Data type (label)
(d) Device to be converted to pulse Bit ANY_BOOL
Operand Bit Word Double word Indirect
specification
Constant Others
(DY)
X, Y, M, L,
SM, F, B, SB
U\G T, ST,
C, LC
T, ST, C, D,
W, SD, SW, R
U\G Z LC LZ K, H E $
(d)
*1
*2
PLF M0
X5
X5 OFF
M0 OFF
ON
ON
1 scan 1 scan
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