Справочник Пользователя для Mitsubishi Electronics FXCPU
18 Applied Instructions (Floating Point)
18.13 DLOGE / Floating Point Natural Logarithm
473
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
11
Appl
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ied
In
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(D
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Ap
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Instru
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Instru
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(High S
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Process
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App
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lied Instr
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(Handy
Instruction)
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Ap
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struct
struct
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(External FX I/O
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Appl
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Instru
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(External
Dev
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(op
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App
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Ap
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Appl
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App
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App
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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.)
FX
3U(C)
FX
3G(C)
FX
3S
FX
2N(C)
FX
1N(C)
FX
1S
FX
U
/FX
2C
FX
0N
FX
0(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
variable
EN
Execution condition
Bit
Head device for storing the binary floating decimal point data for natural
logarithm operation.
logarithm operation.
FLOAT(Single
Precision)
Precision)
Output
variable
variable
ENO
Execution state
Bit
Head device for storing the operation result.
FLOAT(Single
Precision)
Precision)
Operand
type
Bit Devices
Word Devices
Others
System user
Digit designation
System
user
Special
unit
Index
Cons
tant
Real
Number
Character
String
Pointer
X Y M T C S D
.b KnX KnY KnM KnS T C D
R
U
\G
V Z Modifier K H
E
"
"
P
z z
z
z
z
z z
z
z
DLOGE
EN
ENO
d
s
DLOGEP
EN
ENO
d
s
Command
input
input
DLOGE
EN
ENO
d
s
+1
Binary floating decimal
point (real number)
point (real number)
+1
Binary floating decimal
point (real number)
point (real number)
log
e
d
s
s
d
Head device for storing the binary floating
decimal point data for natural logarithm operation
decimal point data for natural logarithm operation
Head device for storing
the operation result
the operation result