F320_LN

The natural logarithm (LN) is calculated of the data specified in s, and the result is stored in d.

Parameters

Input

s (REAL)

Real number input data.

Output

d (REAL)

32-bit area for result (destination).

Remarks

• F320_LN is the reverse function of F321_EXP.

• F320_LN cannot be programmed in the interrupt program.

• Instead of using F320_LN, you can use variables of the type REAL with the more flexible instruction LN.

Error flags

sys_bIsOperationErrorHold (turns to TRUE and remains TRUE)

• if data other than real number data is specified in s.

• if s is not greater than zero.

sys_bIsOperationErrorNonHold (turns to TRUE for one scan)

• if data other than real number data is specified in s.

• if s is not greater than zero.

sys_bIsEqual (turns to TRUE and remains TRUE)

if the result of processing is recognized as "0".

sys_bIsCarry (turns to TRUE for one scan)

if the result is overflowed.