Mitsubishi Electric MELSEC iQ-R Series - Calculating the Natural Logarithm of Double-Precision Real Number

7 APPLICATION INSTRUCTIONS
7.9 Real Number Instructions
825
7
Calculating the natural logarithm of double-precision real number
LOGD(P)
These instructions calculate the logarithm using the natural logarithm (e) of the value specified by a double-precision real
number as the base.
*1 The LOGD instruction does not support the ST and FBD/LD. Use the standard function, LOG.
Page 1897 LOG(_E)
■Execution condition
Setting data
■Description, range, data type
■Applicable devices
Ladder ST
*1
ENO:=LOGDP(EN,s,d);
FBD/LD
*1
Instruction Execution condition
LOGD
LOGDP
Operand Description Range Data type Data type (label)
(s) Data used for natural logarithm operation, or the start
device containing the data
0, 2
-1022
|(s)|<2
1024
Double-precision real
number
ANYREAL_64
(d) Start device for storing the operation result  Double-precision real
number
ANYREAL_64
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,
FX, FY
J\ T, ST, C, D, W,
SD, SW, FD, R,
ZR, RD
U\G, J\,
U3E\(H)G
Z LT, LST,
LC
LZ K, H E $
(s)   
(d)         
RnCPU
RnENCPU
RnSFCPU RnSFCPURnPCPURnPCPU
(Standard) (Safety)
(Redundant) (Process)
(s) (d)
EN ENO
ds