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Mitsubishi Electronics FX3G User Manual

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211
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 Series
Programming Manual - Basic & Applied Instruction Edition
7 Basic Instruction
7.12 PLS, PLF
1
Introdu
ction
2
Ov
ervi
ew
3
Instruction 
Li
st
4
D
evices 
in Det
ai
l
5
Specifi
ed the
De
vice
 &
 
C
onst
ant
6
Bef
ore
 
Pr
og
ra
mmi
ng
7
Bas
ic 
Instruction
8
FN
C00-FN
C0
9
Program Fl
ow
9
FNC
10-FN
C19
Mov
e & Com
pare
10
FNC
20-FNC
29
Arith. & Lo
gi
c 
Operati
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 7.16.
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
S
1
S
2
PLF
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