Mitsubishi FX3G Series Programming Manual

505
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.13 FNC125 – LOGE / Floating Point Natural Logarithm
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
Program example
In the program example shown below, natural logarithm of "10" set in D50 is calculated, and stored to D30 and D31
when X000 turns ON.
X000
FNC 49
FLT
D50
Data used in the natural logarithm operation is set
([1]).
The data to be used is converted into binary floating
point (real number) ([2]).
The natural logarithm operation is executed ([3]).
D40
FNC 12
MOV
K10 D50
FNC125
DLOGE
D40 D30
END
Binary floating point
(real number) value
10
10
[1]
MOV
10
b15 b0
[2] Conversion into
binary floating point
(real number)
[3] Logarithm
operation
LOGE
D41 D40
Binary floating point
(real number) value
2.302585
D31 D30
FLT
D50
Binary value

Mitsubishi FX3G Series Specifications

General

Model	FX3G Series
Power Supply	AC 100-240V or DC 24V
Program Capacity	32, 000 steps
Execution Speed	0.21 µs/basic instruction
Communication Options	RS-422, USB, Ethernet
Expansion Modules	Analog, digital, communication
Programming Language	Ladder Logic, Instruction List
Built-in Functions	High-speed counters, pulse output
Analog I/O	Available via expansion modules