184
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
7 Basic Instruction
7.11 PLS, PLF
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.
Caution
1. Cautions on write during RUN
1) Instructions for falling edge pulse
When write during RUN is completed for a circuit including an instruction for falling edge pulse (LDF,
ANDF, or ORF instruction), the instruction for falling edge pulse 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 for falling edge pulse 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) Instructions for rising edge pulse
When write during RUN is completed for a circuit including an instruction for rising edge pulse, the
instruction for rising edge pulse 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.
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
M0
X000
M1
X000
M0
PLS
M1
=
<PLS instruction>
ON
X000
M 0
ON during
one operation
cycle
ON
M 1
<PLS instruction>
X000
M0
PLS
<Pulse operation type applied instruction>
M0
D0
K10
FNC12
MOV
X000
D0
K10
FNC12
MOVP
