Справочник Пользователя для Mitsubishi Electronics FXCPU
18 Applied Instructions (Floating Point)
18.12 DEXP / Floating Point Exponent
471
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
11
Appl
ied
ied
In
stru
cti
cti
ons
(D
ata O
per
at
io
n)
12
Ap
plied
Instru
ctio
ns
Instru
ctio
ns
(High S
peed
Process
ing)
13
App
lied Instr
lied Instr
ucti
ons
(Handy
Instruction)
14
Ap
pl
ied In
struct
struct
ions
(External FX I/O
D
evice)
15
Appl
ied
ied
Instru
cti
cti
ons
(External
Dev
ice
ice
(op
tional
dev
ice)
)
tional
dev
ice)
)
16
App
lie
lie
d Instr
uction
s
s
(E
xter
nal
nal
Devi
ce)
17
Ap
pl
ied Inst
ruct
io
io
ns
(Dat
a T
ransf
er 2)
a T
ransf
er 2)
18
Appl
ied
ied
In
stru
cti
cti
ons
(Float
ing P
oin
oin
t)
19
App
lie
lie
d Instr
uction
s
s
(D
at
a Oper
at
ion 2)
20
App
lied Inst
lied Inst
ructi
ons
ons
(Pos
itioning
Control)
18.12 DEXP / Floating Point Exponent
Outline
This instruction executes exponential operation whose base is "e (2.71828)".
→ As for handling of floating decimal point, refer to FX Structured Programming Manual [Device &
Common].
1. Format and operation, execution form
2. Set data
3. Applicable devices
Function and operation explanation
1. 32-bit operation (DEXP/DEXPP)
By exponential operation of the device specified by
, the operation result is stored in the device specified
by
. Real number can be directly specified in the device specified by
.
• In exponential operation, the bottom (e) is supposed to be 2.71828.
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
DEXP
32 bits
Continuous
DEXP(EN, s, d);
DEXPP
32 bits
Pulse
DEXPP(EN, s, d);
Variable
Description
Data type
Input
variable
variable
EN
Execution condition
Bit
Head device for storing binary floating decimal point data for exponential
operation.
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
DEXP
EN
ENO
d
s
DEXPP
EN
ENO
d
s
Head device for storing binary floating
decimal point data for exponential operation
decimal point data for exponential operation
Head device for storing
the operation result
the operation result
Command
input
input
DEXP
EN
ENO
d
s
+1
Binary floating decimal point
(real number)
(real number)
+1
Binary floating decimal point
(real number)
(real number)
e
d
s
d
s