Mitsubishi Electric MELSEC FX Series - 7.12.12 DEXP

7 Applied Instructions
7.12 Floating Point
481
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1
Outline
2
Instruction List
3
Configuration of Instruction
4
How to Read Explanation of Instructions
5
Basic Instruction
6
Step Ladder Instructions
7
Applied Instructions
8
Interrupt Function and Pulse Catch Function
A
Relationships between devices and addresses
7.12.12 DEXP
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.
FX3U(C) FX3G FX2N(C) FX1N(C) FX1S FXU/FX2C FX0N FX0(S)
Instruction
name
Operation
Execution
form
Expression in each language
Structured ladder ST
DEXP 32 bits Continuous DEXP(EN, s, d);
DEXPP 32 bits Pulse DEXPP(EN, s, d);
Variable Description Data type
Input
variable
EN Execution condition Bit
Head device for storing binary floating decimal point data for exponential
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
VZModifierK H E
"
"
P
zz z z z
zz z z
DEXP
EN ENO
d
s
DEXPP
EN ENO
d
s
Label 1
*1
Label 2
*2
Command
input
DEXP
EN ENO
d
s
*1. To define the head device for storing the binary floating decimal
point data for exponential operation.
*2. To define the head device for storing the operation result.
+1
Binary floating decimal point
(real number)
+1
Binary floating decimal point
(real number)
e
ds ds