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8 APPLICATION INSTRUCTION
8.9 Real Number Instruction
539
8
Calculating the common logarithm of single-precision real
number
LOG10(P)/DLOG10(P)
These instructions calculate the common logarithm (the logarithm whose base is 10) of a value specified by (s), and store the
operation result in the device specified by (d).
The LOG10(P) instructions can also be used as DLOG10(P).
Setting data
■
Descriptions, ranges, and data types
■
Applicable devices
Processing details
• These instructions calculate the common logarithm (the logarithm whose base is 10) of a value specified by (s), and store
the operation result in the device specified by (d).
• Only a positive value can be set in (s). (The common logarithm operation cannot be executed for a negative value).
• The table below shows the related devices.
Ladder diagram
Structured text
ENO:=LOG10(EN,s,d);
ENO:=LOG10P(EN,s,d);
FBD/LD
Operand Description
Range
Data type
Data type (label)
(s)
Data whose common logarithm is calculated or head device
number where the data is stored
Single-precision real number
ANYREAL_32
(d)
Head device number for storing the operation result
Single-precision real number
ANYREAL_32
EN
Execution condition
Bit
BOOL
ENO
Execution result
Bit
BOOL
Operand
Bit
Word
Double word Indirect
specification
Constant
Others
X, Y, M, L, SM,
F, B, SB, S
T, ST, C, D, W,
SD, SW, R
U
\G
Z
LC
LZ
K, H
E
$
(s)
(d)
Device
Name
Description
Condition
Operation
SM700
Carry
The absolute value of the operation result
2
128
The value of (d) is the maximum value (2
128
) of 32-bit real
numbers and the carry flag SM700 turns on.
SM8020
Zero
The operation result is true "0".
(The mantissa part is "0").
The zero flag SM8020 turns on.
SM8021
Borrow
The absolute value of the operation result < 2
-126
The value of (d) is the minimum value (2
-126
) of 32-bit real
numbers and the borrow flag SM8021 turns on.
SM8022
Carry
The absolute value of the operation result
2
128
The value of (d) is the maximum value (2
128
) of 32-bit real
numbers and the carry flag SM8022 turns on.
(s)
(d)
EN
ENO
d
s
log
10
( )
(s)+1
(s)
(d)+1
(d)
Single-precision real number
Single-precision real number
Summary of Contents for MELSEC iQ-F FX5
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