Mitsubishi Electric MELSEC FX3U - FNC122 - EMUL; Floating Point Multiplication

528
FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.10 FNC122 – EMUL / Floating Point Multiplication
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
S: This function is supported only in FX3U/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 VZModifyKH E "  "P
33
S
333 3
33
S
333 3
33
S
3
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