Mitsubishi MELSEC-Q/L User Manual

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.
Function
(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.)
Operation Error
(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 flo ating-point data
(Single precisio n)
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
LOGP
LOG
LOGP
LOG
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 DS D
log
S
S
S

Mitsubishi MELSEC-Q/L Specifications

General

Brand	Mitsubishi
Model	MELSEC-Q/L
Category	Controller
Language	English