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584
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
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, DS, 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, DS, 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