5 Basic Instruction
5.11 PLS, PLF
94
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
Cautions
1) When write during RUN is completed for a circuit including an instruction for falling edge pulse (LDF,
ANDF or ORF instruction), the instruction is not executed without regard to the ON/OFF status of the
target device of the instruction for falling edge pulse.
When write during RUN is completed for a circuit including an instruction for falling edge pulse (PLF
instruction), the instruction is not executed without regard to the ON/OFF status of the operation condition
device.
It is necessary to set to ON the target device or operation condition device once and then set it to OFF for
executing the instruction for falling edge pulse.
2) When write during RUN is completed for a circuit including an instruction for rising edge pulse, the
instruction is executed if a target device of the instruction for rising edge pulse or the operation condition
device is ON.
Target instructions for rising edge pulse: LDP, ANDP, ORP, and pulse operation type applied instructions
(such as MOVP)
*1. PLS instruction is not executed.
3) Some restrictions to applicable devices
S1: Excluding special auxiliary relays (M)
S2: Only the FX
3U and FX3UC PLCs are capable of indexing applicable devices.
The following devices cannot be indexed.
• Special auxiliary relays (M)
Contact ON/OFF status
(while write during RUN is
executed)
Instruction for rising edge pulse Instruction for falling edge pulse
OFF Not executed Not executed
ON
Executed
*1
Not executed
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