Mitsubishi Electric FX3U SERIES - 10 Arithmetic and Logical Operation ( +, −, ×, ÷) - FNC 20 to FNC 29; FNC 20 - ADD; Addition

270
FX3G/FX3U/FX3UC 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
S: This function is supported only in FX3U/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
33333333 S 33333
33333333 S 33333
3333333 S 33 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