Mitsubishi Electric FX3G SERIES Programming Manual page 513

Programmable controllers

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Table of Contents

Series Programmable Controllers

Programming Manual - Basic & Applied Instruction Edition

Program example

In the program example shown below, the exponential operation is executed for a value set in the 2-digit BCD format

in X020 to X027, and the operation result is stored in the binary floating point format to D0 and D1 when X000 turns

Operation when "13" is specified in X020 to X027

The operation result becomes less than "2

If a value "89" or more is set, an operation error occurs. To prevent this operation error, when a value more than

"89" is set, M0 is set to ON so that the exponential operation is not executed.

Conversion from natural logarithm into common logarithm

In the CPU, operations are executed in natural logarithm.

For obtaining a value in common logarithm, specify a common logarithm value divided by "0.4342945" in

[2] Conversion into

binary floating point

(real number)

Binary value

18 Floating Point – FNC110 to FNC139

18.12 FNC124 – EXP / Floating Point Exponent

Data used in the exponential operation is input ([1]).

The range of the value to be operated is checked.

(Refer to 1) in "Points" below.)

The input data is converted into binary floating point

(real number) ([2]).

The exponential operation is executed ([3]).

Binary floating point

(real number) value

" when the BCD value set in X020 to X027 is "88" or less because of

Binary floating point

(real number) value

Fx3u series Fx3uc series