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5 Basic Instruction
5.11 PLS, PLF
86
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
3. Output drive side
The following two circuits cause a same operation.
In each case, M0 is ON during only one operation cycle when X000 changes from OFF to ON.
In each case, MOV instruction is executed only once when X000 changes from OFF to ON.
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
<<OUT instruction>>
X000
X000
M1
=
<<PLS instruction>>
ON
X000
M 0
ON during one
operation cycle
ON
M 1
X000
PLS
EN ENO
d
M0
M0
M1
<<PLS instruction>> <<Pulse operation type applied instruction>>
X000
MOV
EN
s
ENO
d
D0K10
M0
PLS
EN ENO
d
M0
MOVP
EN
s
ENO
d
D0K10