Mitsubishi Electric MELSEC FX Series - 7.12.14 DLOG10

7 Applied Instructions
7.12 Floating Point
485
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
7.12.14 DLOG10
Outline
This instruction executes common logarithm operation.
→ 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 (DLOG10/DLOG10P)
By common logarithm operation of the device specified by (logarithm supposing 10 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 FX2N(C) FX1N(C) FX1S FXU/FX2C FX0N FX0(S)
Instruction
name
Operation
Execution
form
Expression in each language
Structured ladder ST
DLOG10 32 bits Continuous DLOG10(EN, s ,d);
DLOG10P 32 bits Pulse DLOG10P(EN ,s ,d);
Variable Description Data type
Input
variable
EN Execution condition Bit
Head device for storing the binary floating decimal point data for common
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
VZModifierK H E
"
"
P
zz z z z
zz z z
DLOG10
EN ENO
d
s
DLOG10P
EN ENO
d
s
+1 +1
ds
Binary floating decimal
point (real number)
Binary floating decimal
point (real number))
log
10
Command
input
DLOG10
EN ENO
d
s
s d
Label 1
*1
Label 2
*2
*1. To define the head device for storing the binary floating
decimal point data for common logarithm operation.
*2. To define the head device for storing the operation result.