Attention

IronPLC can only run very simple programs. The steps described are accurate but many language features are not yet supported.

LN¶

Returns the natural logarithm of a numeric input.

IEC 61131-3	Section 2.5.1.5.2
Support	Not yet supported

Signatures¶

#	Input (IN)	Return Type	Support
1	`REAL`	`REAL`	Not yet supported
2	`LREAL`	`LREAL`	Not yet supported

Returns the natural logarithm (base e) of IN. The input must be positive; the result of LN applied to zero or a negative value is undefined.

result := LN(REAL#2.718282);  (* result ~ 1.0 *)
value := LN(LREAL#1.0);      (* value = 0.0 *)