534
LOG, LOGP
: Data of which the natural logarithm is obtained or head number of the devices where the data is stored (real number)
: Head number of the devices where the operation result will be stored (real number)
*1:
Applicable for the Universal model QCPU, LCPU.
F
unct
i
on
(1) Returns the natural logarithm of the value designated by taking (e) as base, and stores operation results at device
designated by .
(2) Only positive values can be designated by . (Operation cannot be performed on negative numbers.)
Operat
i
on
E
rror
(1) In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into
SD0.
*2:
There are CPU modules that will not result in an operation error if -0 is specified.
For details, refer to Page 88, Section 3.2.4.
7.12.23 LOG, LOGP
Natural logarithm operation on floating-point data
(Single precision)
7.12.23
LOG, LOGP
• Basic model QCPU: The serial number (first five digits) is
"04122" or later.
Setting
Data
Internal Devices
R, ZR
J \
U \G
Zn
Constants
E
Other
Bit
Word
Bit
Word
––
––
*1
––
––
––
*1
––
––
Error
code
Error details
Q00J/
Q00/
Q01
QnH
QnPH QnPRH
QnU
LCPU
4100
The value specified in is negative.
The value specified in is 0.
––
The specified device value is -0.
*2
––
––
4140
The specified device value is not within the following range:
0, 2
-126
| Specified device value | < 2
128
The specified device value is -0, unnormalized number, nonnumeric,
and ±
.
––
––
––
––
4141
The operation result exceeds the following range (when an overflow
occurs):
2
128
| Operation result |
––
––
––
––
Basic
Process
High
performance
Redundant Universal
LCPU
Ver.
Command
Command
L
OGP
LOG
LOGP
L
OG
S
D
S
D
S
D
S
D
S
D
32-bit floating-point
real number
(
)
32-bit floating-point
real number
+1
+1
S
D
S
D
log
S
S
S