576
FX3G/FX3U/FX3GC/FX3UC Series
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 FX0N-3A
*1
or FX2N-2AD.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (RD3A)
m1 : Special block number
FX3G/FX3U/FX3GC/FX3UC (D, DS, DSS) PLCs : K0 to K7
FX3UC-32MT-LT(-2) : K1 to K7 (K0 indicates the built-in CC-Link/LT master.)
m2 : Analog input channel number
FX0N-3A
*1
: K1 (ch 1) or K2 (ch 2)
FX2N-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)
FX2N-2AD : 0 to 4095 (12 bits)
*1. The FX0N-3A is available only for the FX3U and FX3UC PLCs.
Operand Type Description Data Type
m1
Special block number
-FX3G/FX3U/FX3GC/FX3UC (D, DS, DSS) PLCs: K0 to K7
-FX3UC-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
XYMTCSD
.b KnX KnY KnM KnS T C D R
U\G
V Z Modify K H E "
"P
m1 33333333 33333
m2 33333333 33333
3333333 333
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
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