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FX
3G
/FX
3U
/FX
3UC
 Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
22 External Device – FNC170 to FNC179
22.3 FNC176 – RD3A / Read form Dedicated Analog Block
21
FN
C
160
-F
N
C
16
9
R
eal
 T
im
e C
lock
 
C
ont
ro
l
22
FN
C
170-
FN
C
179
E
xte
rnal D
evice
23
FN
C
180
A
lter
nate 
In
st
ru
ct
ions
24
FN
C
181-
FN
C
18
9
O
ther
s
25
FN
C
190-
FN
C
199
B
lock D
ata
 
O
per
ation
26
FN
C2
00
-F
NC
20
9
C
ha
racter
 S
tring 
Co
ntro
l
27
FN
C
210-
FN
C
21
9
Da
ta
 
O
per
ati
on 3
28
FN
C
220-
FN
C
249
Da
ta
 
C
om
par
ison
29
FN
C
25
0-F
N
C
269
D
ata T
abl
e 
O
per
at
ion
30
FN
C
270-
FN
C
274
Ex-
D
ev
ice 
Inv
ert
er
 Com
m
s
22.3
FNC176 – RD3A / Read form Dedicated Analog Block
Outline
This instruction reads an analog input value from the analog block FX
0N
-3A
*1
 or FX
2N
-2AD.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (RD3A)
m1 
‚
: Special block number
FX
3G
/FX
3U
/FX
3UC
 (D, DSS)
 
PLC : K0 to K7
FX
3UC
-32MT-LT(-2) : K1 to K7 (K0 indicates the built-in CC-Link/LT master.)
m2 
‚
:  Analog input channel number
FX
0N
-3A
*1
: K1 (ch 1) or K2 (ch 2)
FX
2N
-2AD : K21 (ch 1) or K22 (ch 2)
: Read data
A value read from the analog block is stored.
FX
0N
-3A
*1
: 0 to 255 (8 bits)
FX
2N
-2AD : 0 to 4095 (12 bits)
*1.
The FX
0N
-3A is available only for the FX
3U
 and FX
3UC
 PLCs.
Operand Type
Description
Data Type
m1 ‚
Special block number 
- FX
3G
/FX
3U
/FX
3UC 
(D, DSS) PLC: K0 to K7
- FX
3UC
-32MT-LT(-2)  : K1 to K7
16-bit binary
m2 ‚
Analog input channel number
16-bit binary
Word device storing the read data
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
m1 ‚
3
3
3
3
3 3 3 3
3 3
3
3 3
m2 ‚
3
3
3
3
3 3 3 3
3 3
3
3 3
3
3
3
3 3 3 3
3 3
3
P
FNC 176
RD3A
Mnemonic
Operation Condition
16-bit Instruction
 7 steps
RD3A
RD3AP
Mnemonic
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
−
  D
  D
FNC176
RD3A
m1‚
m2‚
Command
input
D‚
  D