xLadder user manual-V2.0.0.6

6.7.7 LN

Input/output Operand

Data type

IN

VD, ID, QD, MD, SMD, SD, LD, AC,constant, *VD, *LD, *AC

Real number

OUT

VD, ID, QD, MD, SMD, SD, LD, AC, *VD, *LD, *AC

Real number

LN: Use the input value to perform natural logarithm

calculation and put the result in OUT.

The output value × 2.302585 ≈ Natural logarithm of 10

SM1.1 is used for indicating overflow errors and illegal values.

error conditions:

SM1.1

Overflow

Special memory bit:

Zero result

SM1.0

Overflow

SM1.1

Negative result

SM1.2

126

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