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7.12 Special Function Instructions
7.12.21 Natural logarithm operation on floating-point data (single precision)
LOG
7.12.21
Natural logarithm operation on floating-point data
(single precision)
LOG
Function
(1) Evaluates the natural logarithm function on the value specified for
taking (e) as a base,
and stores the result to the device specified for
.
(2) Only positive values can be specified for
. (Operation cannot be performed on negative
numbers.)
LOG(P)
P: Executing condition
:
indicates any of the following
instructions.
LOG
LOGP
Input argument,
EN:
Executing condition
:Bit
s:
Data on which the natural logarithm function is evaluated
:Single-precision real/ANY32
Output argument,
ENO:
Execution result
:Bit
d:
Operation result
:Single-precision real/ANY32
Setting
data
Internal device
R, ZR
J
\
U
\G
Zn
Constant
E
Others
Bit
Word
Bit
Word
−
−
−
−
−
−
−
−
−
Universal
UD
High
Performance
Structured ladder
ST
LO
G
EN
ENO
s
d
LO
G
(EN,
s
, d);
ENO:=
s
d
s
d
Fl
oat
i
ng
-
po
i
nt
rea
l
number
(
)
Fl
oat
i
ng
-
po
i
nt
rea
l
number
s
d
l
og
s
Summary of Contents for MELSEC Q Series
Page 1: ...Structured Programming Manual Mitsubishi Programmable Controller QCPU Common Instructions ...
Page 2: ......
Page 14: ...A 12 MEMO ...
Page 340: ...6 178 MEMO MTR ...
Page 708: ...7 368 MEMO ...
Page 776: ...8 68 MEMO ...
Page 796: ...9 20 MEMO ...
Page 804: ...App 8 MEMO ...
Page 812: ...Index 8 MEMO ...
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