Mitsubishi MELSEC iQ-F FX5 series User Manual

16 SINGLE NUMBER VARIABLE FUNCTIONS
16.3 Natural Logarithm Operation
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16
16.3 Natural Logarithm Operation
LN(_E)
These functions output the natural logarithm operation result of an input value.
Setting data
■Descriptions, types, and data types
Processing details
■Operation processing
• These functions calculate the logarithm whose base is "e" of the REAL type data input to (s), and output from (d).
• These functions are expressed as follows when the input value is "A" and the output operation result is "B".
• In the natural logarithm operation, the base "e" is set to "2.71828".
■Operation result
1. Function without EN/ENO
The following table lists the operation results.
2. Function with EN/ENO
The following table lists the execution conditions and operation results.
*1 When FALSE is output from ENO, data output from (d) is undefined. In that case, modify a program so that the data output from (d) is
not used.
Operation error
Ladder diagram Structured text
[Without EN/ENO] [With EN/ENO] [Without EN/ENO]
d:=LN(s);
[With EN/ENO]
d:=LN_E(EN,ENO,s);
Argument Description Type Data type
EN Execution condition (TRUE: Execution, FALSE: Stop) Input variable BOOL
s Input Input variable REAL
ENO Output status (TRUE: Normal, FALSE: Abnormal) Output variable BOOL
d Output Output variable REAL
B=log
e
A
Operation result (d)
No operation error occurred Operation output value
An operation error occurred Indefinite value
Execution condition Operation result
EN ENO (d)
TRUE (Executes operation) TRUE (Operation error did not occur) Operation output value
FALSE (Stops operation) FALSE
*1
Indefinite value
Error code
(SD0/SD8067)
Description
3405 A negative value is input.
The data after conversion is other than -3.40282
+38
to -1.17549
-38
, 0, or 1.17549
-38
to 3.40282
+38
.
sd
EN ENO
ds

Mitsubishi MELSEC iQ-F FX5 series Specifications

General

Brand	Mitsubishi
Model	MELSEC iQ-F FX5 series
Category	Controller
Language	English