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FX
3G
/FX
3U
/FX
3UC
 Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
16 External FX Device – FNC 80 to FNC 89
16.7 FNC 86 - VRSC / Volume Scale
11
FN
C
30
-FN
C
39
R
otati
on and 
Shi
ft
12
FNC4
0-F
NC4
9
D
ata O
per
ati
on
13
FN
C
50-FN
C
59
H
igh S
pe
ed 
P
rocessing
14
FM
C
60-FN
C
69
H
andy 
In
st
ru
ct
ion
15
FNC7
0-F
NC7
9
Ex
ter
nal FX
 I/O
 
D
evice
16
FN
C
80-FN
C
89
Ext
ernal
 FX 
De
vic
e
17
FN
C
100-
FN
C
10
9
Da
ta
 
Transf
er 2
18
FN
C
110-
FN
C
139
Floati
ng Poi
nt
19
FN
C
14
0-F
N
C
149
Da
ta
 
O
per
at
ion 2
20
FN
C
150-
FN
C
159
Posit
ioning 
C
ont
ro
l
16.7
FNC 86 - VRSC / Volume Scale
Outline
This instruction reads the value of a variable analog potentiometer on the variable analog potentiometer board 
(FX
3G
-8AV-BD) attached to the FX
3G
 PLC main unit as a numeric value in the range from 0 to 10.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
This instruction reads the value of a variable analog potentiometer on the variable analog potentiometer board
attached to the main unit as a numeric value in the range from 0 to 10.
However, the actual scale value does not always correspond to the switching position of the variable analog
potentiometer scale (0 to 10).
This instruction converts into a binary value the scale value of a variable analog potentiometer specified in
, and
transfers the converted binary value to
.
Operand type
Description
Data type
Volume number [setting range: 0 to 7]
16-bit binary
Device to which the read analog value is transferred
16-bit binary
Oper-
and 
Type
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
3 3
3
3 3
3
3
3
3 3 3 3
3 3
3

Mnemonic
Operation Condition
16-bit Instruction
5 steps VRSC
VRSCP
Mnemonic
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
P
FNC 86
VRSC
VOLUME SCALE
S
1
 ‚
  S
  D
S
1
 ‚
  S
S
2
 ‚
  D
S
1
 ‚
  S
  D
FNC 86
VRSC
Command
input
S ‚
D ‚