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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.10 FNC122 – EMUL / Floating Point Multiplication
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
18.10 FNC122 – EMUL / Floating Point Multiplication
Outline
This instruction executes multiplication 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.
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
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. 32-bit operation (DEMUL and DEMULP)
Binary floating point data [ +1, ] is multiplied by binary floating point data [ +1, ], and the
multiplication 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.
Operand Type Description Data Type
Word device number storing binary floating point data used in multiplication
Real number (binary)
*1
Word device number storing binary floating point data used in multiplication
Data register number storing the multiplication 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 V Z Modify K H E ""P
S1 S2
S1 S2
S1 S2
P
FNC 122
EMUL
D
−
Mnemonic Operation Condition
16-bit Instruction
DEMUL
DEMULP
Mnemonic Operation Condition
32-bit Instruction
13 steps
Continuous
Operation
Pulse (Single)
Operation
S
1
S
2
D
S
1
S
2
D
S
1
S
1
S
2
S
2
D
D
Command
input
FNC122
DEMUL
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
FNC122
DEMUL
S
1
S
2
D
[ +1, ]
×
[ K100 ]
→
[ +1, ]
Binary floating point Automatically
converted into binary
floating point
Binary floating point
S
1
S
1
D
D
Command
input