246
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
10 Arithmetic and Logical Operation (
+
,
−
,
×
,
÷
) – FNC 20 to FNC 29
10.1 FNC 20 – ADD / Addition
10.1
FNC 20 – ADD / Addition
Outline
This instruction executes addition by two values to obtain the result (A + B = C).
→
For the floating point addition instruction EADD (FNC120), refer to Section 18.8.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (ADD and ADDP)
The contents of
are added to
in the binary format, and the addition result is transferred to
.
• The most significant bit of each data indicates the sign (positive: 0 or negative: 1), and data are added
algebraically.
5 + (
−
8) =
−
3
• When a constant (K) is specified in
or
, it is automatically converted into the binary format.
2. 32-bit operation (DADD and DADDP)
The contents of [
+1,
] are added to [
+1,
] in the binary format, and the addition result
is transferred to [
+1,
].
• The most significant bit of each data indicates the sign (positive: 0 or negative: 1), and data are added
algebraically.
5500 + (
−
8540) =
−
3040
• When a constant (K) is specified in [
+1,
] or [
+1,
], it is automatically converted into
the binary format.
Operand type
Description
Data type
Data for addition or word device number storing data
16- or 32-bit binary
Data for addition or word device number storing data
16- or 32-bit binary
Word device number storing the addition result
16- or 32-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
3
3
3
3 3 3 3
3
3 3
3
3 3
3
3
3
3 3 3 3
3
3 3
3
DADD
DADDP
Mnemonic
Operation Condition
P
FNC 20
ADD
D
16-bit Instruction
7 steps
ADD
ADDP
Mnemonic
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
13 steps
Continuous
Operation
Pulse (Single)
Operation
S
1
S
2
D
S
1
S
2
D
S
2
S
1
D
FNC 20
ADD
S
1
S
2
+
→
Command
input
D
S
1
S
2
D
S
1
S
2
S
2
S
2
S
1
S
1
D
1
D
1
FNC 20
DADD
S
1
S
2
[ +1, ] + [ +1, ]
→ [ +
1, ]
Command
input
D
S
1
S
2
D
S
1
S
2
D
S
1
S
1
S
2
S
2