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Mitsubishi Electronics Mitsubishi Digital Electronics Video Gaming Accessories FX3G ユーザーズマニュアル

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FX
3G
/FX
3U
/FX
3UC
 Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
7 Basic Instruction
7.12 PLS, PLF
1
In
trodu
ct
ion
2
O
ver
vi
ew
3
In
st
ru
ct
ion 
Li
st
4
D
evices 
in D
etail
5
Specifi
ed t
he
D
evice &
 
C
onst
ant
6
Bef
ore 
Pr
ogr
am
m
ing
7
B
asic 
In
st
ru
ct
ion
8
FNC0
0-F
NC0
9
Pr
ogr
am
 Flow
9
FN
C
10-FN
C
19
Mo
ve
 &
 Co
mp
are
10
FNC2
0-F
NC2
9
Ar
ith.
 &
 Logic 
O
per
ati
on
7.12
PLS, PLF
Outline
When PLS instruction is executed, an applicable device is activated during only one operation cycle after a drive input
turns ON.
When PLF instruction is executed, an applicable device is activated during only one operation cycle after a drive input
turns OFF.
1. Instruction format
→ For the number of instruction steps, refer to Section 7.15.
2. Applicable devices
S
1
: Except special auxiliary relays (M)
S
2
: This function is supported only in FX
3U
/FX
3UC
 PLCs.
Explanation of function and operation
1. PLS instruction (rising edge pulse)
In the figure above, M0 is ON during only one operation cycle when X000 changes from OFF to ON.
2. PLF instruction (falling/trailing edge pulse)
In the figure above, M1 is ON during only one operation cycle when X000 changes from ON to OFF.
Instruc-
tion
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special 
Unit
Index
Con-
stant
Real 
Number
Charac-
ter String
Pointer
X Y M T C S D….b KnX KnY KnM KnS T C D R U…\G… V Z Modify K H
E
"…"
P
PLS
3
S
1
S
2
PLF
3
S
1
S
2
PLS
Pulse
Basic Instruction
PLS
−
Continuous
Operation
Pulse (Single)
Operation
Mnemonic
Operation Condition
PLF
Pulse Falling
Basic Instruction
PLF
−
Continuous
Operation
Pulse (Single)
Operation
Mnemonic
Operation Condition
ON
Circuit program
List program
Timing chart
X000
M0
PLS
0000   LD    X000
0001   PLS   M   0
X000
M   0
PLS
instruction
ON during
one operation
cycle
ON
Circuit program
List program
Timing chart
X000
M1
PLF
0000   LD   X000
0001   PLF  M   1
X000
M   1
PLF
instruction
ON during
one operation
cycle