Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 123)

Chapter
Expressions, Variables and Operators 9
9 -13
The BASIC module contains a complete set of logarithmic operators.
These operators are one-operand operators.
LOG
Use the LOG operator to return the natural logarithm of the argument.
The argument must be greater than 0. This calculation is carried out to 7
significant digits.
>PRINT LOG(12) Result: 2.484906
>PRINT LOG(EXP(1)) Result: 1
If you need base 10 log, use this expression:
log
10
(x)=log(x)/log(10)
EXP
Use the EXP operator to raise the number e (2.7182818) to the power of
the argument. This operator is the inverse of the LOG operator. The EXP
operator is similar to the ** operator in that it raises a number to a power.
However, it is different from the ** operator in that the only number that is
raised is 2.7182818. (See also ** page 9 -5.)
>PRINT EXP(1) Result: 2.7182818
>PRINT EXP(2) Result: 7.3890559
>PRINT EXP(3) Result: 20.0855362
>PRINT EXP(LOG(2)) Result : 2
Logarithmic Operators