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18 Applied Instructions (Floating Point)
18.13 DLOGE / Floating Point Natural Logarithm
473
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
11
Applied Instructions
(Data Operation)
12
Applied Instructions
(High Speed
Processing)
13
Applied Instructions
(Handy
Instruction)
14
Applied Instructions
(External FX I/O
Device)
15
Applied Instructions
(External Device
(optional device))
16
Applied Instructions
(External Device)
17
Applied Instructions
(Data Transfer 2)
18
Applied Instructions
(Floating Point)
19
Applied Instructions
(Data Operation 2)
20
Applied Instructions
(Positioning
Control)
18.13 DLOGE / Floating Point Natural Logarithm
Outline
This instruction executes natural logarithm operation.
1. Format and operation, execution form
2. Set data
3. Applicable devices
Function and operation explanation
1. 32-bit operation (DLOGE/DLOGEP)
By natural logarithm operation of the device specified by (logarithm supposing e (2.71828) to be the
bottom), the operation result is stored in the device specified by . Real number can be directly specified
in the device specified by .
• The value to be specified by can be set in positive number only. (Negative number cannot be
operated.)
FX3U(C) FX3G(C) FX3S FX2N(C) FX1N(C) FX1S FXU/FX2C FX0N FX0(S)
Instruction
name
Operation
Execution
form
Expression in each language
Structured ladder/FBD ST
DLOGE 32 bits Continuous DLOGE(EN, s, d);
DLOGEP 32 bits Pulse DLOGEP(EN, s, d);
Variable Description Data type
Input
variable
EN Execution condition Bit
Head device for storing the binary floating decimal point data for natural
logarithm operation.
FLOAT(Single
Precision)
Output
variable
ENO Execution state Bit
Head device for storing the operation result.
FLOAT(Single
Precision)
Operand
type
Bit Devices Word Devices Others
System user Digit designation
System
user
Special
unit
Index
Cons
tant
Real
Number
Character
String
Pointer
XYMTCS
D
.b
KnX KnY KnM KnS T C D R
U\G
VZModifierKH E
"
"
P
zz z z z
zz z z
DLOGE
EN ENO
d
s
DLOGEP
EN ENO
d
s
Command
input
DLOGE
EN ENO
d
s
+1
Binary floating decimal
point (real number)
+1
Binary floating decimal
point (real number)
log
e
ds s d
Head device for storing the binary floating
decimal point data for natural logarithm operation
Head device for storing
the operation result