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511
FX
3G
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3U
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3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
18 Floating Point – FNC110 to FNC139
18.14 FNC126 – LOG10 / Floating Point Common Logarithm
11
FN
C
C
30
-FN
C
C
39
R
otati
on and
on and
Shi
ft
ft
12
FNC4
0-F
0-F
NC4
9
D
ata O
per
ati
per
ati
on
13
FN
C
C
50-FN
C
59
H
igh S
pe
ed
P
rocessing
14
FM
C
C
60-FN
C
69
H
andy
In
st
ru
ct
ion
15
FNC7
0-F
0-F
NC7
9
Ex
ter
nal FX
I/O
D
evice
16
FN
C
C
80-FN
C
89
Ext
ernal
FX
ernal
FX
De
vic
vic
e
17
FN
C
100-
FN
FN
C
10
9
Da
ta
Transf
er 2
er 2
18
FN
C
110-
FN
FN
C
139
Floati
ng Poi
nt
19
FN
C
14
0-F
N
C
149
Da
ta
O
per
at
at
ion 2
20
FN
C
150-
FN
FN
C
159
Posit
ioning
C
ont
ro
ro
l
18.14 FNC126 – LOG10 / Floating Point Common Logarithm
Outline
This instruction executes the common logarithm operation.
→ For handling of floating point, refer to Subsection 5.1.3.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 32-bit operation (DLOG10 and DLOG10P)
Common logarithm [logarithm whose base is "10"] of [
+1,
] is calculated, and the operation result is
stored to [
+1,
]. A real number can be directly specified as
.
• Only a positive value can be set in [
+1,
]. (The common logarithm operation cannot be executed for a
negative value.)
Errors
An operation error occurs in the following cases; The error flag M8067 turns ON, and the error code is stored in
D8067.
D8067.
• When a negative value is specified in
(error code: K6706)
• When "0" is specified in
(error code: K6706)
Operand Type
Description
Data Type
Head device number storing binary floating point data used in the common logarithm
operation
operation
Real number (binary)
Head device number storing the operation result
Oper-
and
Type
Bit Devices
Word Devices
Others
System User
Digit Specification
System User
Special
Unit
Index
Con-
stant
stant
Real
Number
Charac-
ter String
Pointer
X Y M T C S D
.b KnX KnY KnM KnS T C D R U
\G
V Z Modify K H
E
"
"
P
3 3
3
3
3
3 3
3
3
P
FNC 126
LOG10
D
−
−
−
Mnemonic
Operation Condition
16-bit Instruction
DLOG10
DLOG10P
Mnemonic
Operation Condition
32-bit Instruction
9 steps
Continuous
Operation
Pulse (Single)
Pulse (Single)
Operation
S
D
S
D
S
S
D
D
S
Command
input
FNC126
DLOG10
S
D
+1
Binary floating point
(real number)
+1
Binary floating point
(real number)
log
10
S
D
S
D
S
S
S
S