Exponent Operation On Floating-Point Data (Double Precision) - Mitsubishi Electric MELSEC-Q/L Programming Manual

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Exponent operation on floating-point data (double precision)

(S): Data of which the exponential value is obtained or head number of the devices where the data is stored (real number)

(D): Head number of the devices where the operation result will be stored (real number)

Internal device

Processing details

• Returns the exponent of the value designated by (S), and stores the results of the operation at the device designated by

64-bit floating-point

• Exponent operations are calculated taking the base (e) to be "2.71828".

• When the operation results in -0 or an underflow, the result is processed as 0.

• When an input value is set using a programming tool, a rounding error may occur. For precautions, refer to Page 89

Precautions.

Operation error

• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.

Error details

The specified device value is not within the following range:

 | Specified device value | <2

The value of the specified device is -0, a subnormal number, NaN (not a

number), or .

The operation result exceeds the following range.

(when an overflow occurs)

|Operation result| < 2

7 APPLICATION INSTRUCTIONS

7.12 Special Function Instructions

64-bit floating-point