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2 Instructions

CP1E CPU Unit Instructions Reference Manual(W483)

Floating-point Math

Instructions

FVAL

Applicable Program Areas

Operands

 Operand Specifications

Flags

Function

FVAL(449) converts the specified ASCII text number (starting at word S) to a 32-bit floating-point num-

ber (IEEE754-format) and outputs the result to the destination words starting at D.

FVAL(449) can convert ASCII text in decimal or scientific notation if it meets the following conditions:

Up to 6 characters are valid, excluding the sign, decimal point, and exponent. Any characters beyond

the 6th character will be ignored.

• Decimal Notation

Real numbers expressed with an integer and fractional part.

Example: 124.56

Instruction Mnemonic Variations

Function

code

Function

ASCII TO FLOATING-POINT FVAL @FVAL 449

Converts a number expressed in ASCII text (deci-

mal or scientific notation) to a 32-bit floating-point

value (IEEE754-format) and outputs the floating-

point value to the specified words.

Symbol

FVAL

Area Step program areas Subroutines Interrupt tasks

Usage OK OK OK

Operand Description Data type Size

S First source word UINT Variable

D First destination word REAL 2

Area

Word addresses Indirect DM addresses

Constants CF

Pulse

bits

CIO WR HR AR T C DM @DM *DM

S, D OKOKOKOKOKOKOK OK OK --- --- --- ---

Name Label Operation

Error Flag P_ER • ON if the digits (integer and fractional parts) in the source data starting at S are not 30 to 39 hex (0 to

9).

• ON if the first two digits of the exponential part do not contain 45 and 2B hex (E+) or 45 and 2D hex

(E-). in the source data starting at S are not 30 to 39 hex (0 to 9).

• ON if there are two or more exponential parts in the source data.

• ON if the data is +∞ or -∞ after conversion.

• ON if there are 0 characters in the text data.

• ON if a byte containing 00 hex is not found within the first 25 characters.

• OFF in all other cases.

Equals Flag P_EQ • ON if the conversion result is 0.

• OFF in all other cases.

S: First source word

D: First destination word

FVAL(449)