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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.8 FNC120 – EADD / Floating Point Addition
11
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
Control
18.8 FNC120 – EADD / Floating Point Addition
Outline
This instruction executes addition of two binary floating point data.
→ For program examples of floating point operations, refer to Section 12.10.
→ For handling of floating point, refer to Subsection 5.1.3.
→ For flag operations, refer to Subsection 6.5.2.
1. Instruction format
2. Set data
*1. When a constant (K or H) is specified, it is automatically converted into binary floating point (real number)
when the instruction is executed.
3. Applicable devices
S: This function is supported only in FX3U/FX3UC PLCs.
Explanation of function and operation
1. 32-bit operation (DEADD and DEADDP)
Binary floating point data [ +1, ] is added to binary floating point data [ +1, ], and the addition
result in the binary floating point format is transferred to [ +1, ].
When a constant (K or H) is specified as [ +1, ] or [ +1, ], it is automatically converted into
binary floating point.
Caution
1. When a same device is specified
The same device number can be specified in [ +1, ],[ +1, ] and [ +1, ].
In this case, note that the addition result changes in every operation cycle when the continuous operation type
instruction (DEADD) is used.
Operand Type Description Data Type
Word device number storing binary floating point data used in addition
Real number
(
binary)
*1
Word device number storing binary floating point data used in addition
Data register number storing the addition result
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 VZModifyKH E ""P
33 S 333 3
33 S 333 3
33 S 3
P
FNC 120
EADD
D
−
Mnemonic Operation Condition
16-bit Instruction
DEADD
DEADDP
Mnemonic Operation Condition
32-bit Instruction
13 steps
Continuous
Operation
Pulse (Single)
Operation
S
1
S
2
D
S
1
S
2
D
S
2
S
2
S
1
S
1
D
D
FNC120
DEADD
Command
input
S
1
S
2
D
[ +1, ] + [ +1, ]
→
[ +1, ]
Binary floating point Binary floating point Binary floating point
S
1
S
1
S
2
S
2
D
D
S
1
S
1
S
2
S
2
FNC120
DEADD
Command
input
S
1
S
2
D
[ +1, ] + [ K2346 ]
→
[ +1, ]
Binary floating point Automatically
converted into binary
floating point
Binary floating point
S
1
S
1
D
D
S
1
S
1
S
2
S
2
D
D