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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
10 Arithmetic and Logical Operation (+, −, ×, ÷) – FNC 20 to FNC 29
10.1 FNC 20 – ADD / Addition
1
Introduction
2
Overview
3
Instruction
List
4
Devices
in Detail
5
Specified the
Device &
Constant
6
Before
Programming
7
Basic
Instruction
8
FNC00-FNC09
Program Flow
9
FNC10-FNC19
Move & Compare
10
FNC20-FNC29
Arith. & Logic
Operation
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
S1: This function is supported only in FX3G/FX3GC/FX3U/FX3UC PLCs.
S2: This function is supported only in FX
3U/FX3UC PLCs.
Explanation of function and operation
1. 16-bit operation (ADD and ADDP)
The contents of are added to in 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 is added algebraically.
5 + (−8) = −3
• When a constant (K) is specified in or , it is automatically converted into binary format.
2. 32-bit operation (DADD and DADDP)
The contents of [ +1, ] are added to [ +1, ] in 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 is added algebraically.
5500 + (−8540) = −3040
• When a constant (K) is specified in [ +1, ] or [ +1, ], it is automatically converted into 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
XYMTCSD.b KnX KnY KnM KnS T C D R U\G V Z Modify K H E ""P
S1 S2
S1 S2
S1 S2
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