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

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Exponent operation on floating-point data (single precision)

• Basic model QCPU: The serial number (first five digits) is "04122" or later.

(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

*1 Applicable for the Universal model QCPU, LCPU.

Processing details

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

32-bit floating-point

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

• 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 operation result is not within the following range:

 | Operation result |  2

The operation result is not within the following range:

 | Operation result | < 2

The specified device value is -0.

The specified device value is -0, unnormalized number, nonnumeric, or .

The operation result exceeds the following range.

(when an overflow occurs)

|Operation result| < 2

*2 There are CPU modules that will not result in an operation error if -0 is specified. For details, refer to Page 87 Using single/double-

precision real number data.

7 APPLICATION INSTRUCTIONS

7.12 Special Function Instructions

Redundant Universal

32-bit floating-point