Omron CJ - INSTRUCTIONS REFERENCE MANUAL 07-2009 Reference Manual page 527

3. Instructions
LOG
Instruction
LOGARITHM
Symbol
Applicable Program Areas
Function block
Area
definitions
Usage OK
Operands
Operand
S First source word
R First result word
Operand Specifications
Word addresses
Area
CIO WR HR AR
S
OK OK OK OK
R
Flags
Name
Error Flag
Equals Flag
Overflow Flag
Underflow Flag
Negative Flag
490
Mnemonic Variations
LOG @LOG
Block program areas Step program areas
OK OK
Description
Indirect DM/EM
addresses
@DM
T C DM EM
@EM
OK OK OK OK OK
Label
ER • ON if the source data is not recognized as floating-point data.
• ON if the source data is negative.
• ON if the source data is not a number (NaN).
• OFF in all other cases.
• ON if both the exponent and mantissa of the result are 0.
• OFF in all other cases.
OF • ON if the absolute value of the result is too large to be expressed as a 32-bit floating-point value.
• OFF in all other cases.
UF OFF
N • ON if the result is negative.
• OFF in all other cases.
Function
code
Calculates the natural (base e) logarithm of a 32-
468 bit floating-point number and places the result in
the specified result words.
LOG
LOG(468)
S: First source word
S
R R: First result word
Subroutines Interrupt tasks
OK
Data type
Registers
Con-
stants
*DM
DR IR
*EM
OK
OK --- ---
---
Operation
CS/CJ/NSJ Series Instructions Reference Manual (W474)
Function
SFC action or
transition programs
OK OK
Size
REAL 2
REAL 2
Flags
Pulse TR
bits bits
Indirect
TK CF
using IR
OK --- --- --- ---