Answer / carl_ellis

Floating point numbers are also called 'real' numbers.
Floating point refers to the inclusion of a decimal point
and values to the right of the decimal point. The number
is expressed in engineering or exponential notation, a
signed mantissa with an exponent.

The IEEE Standard for Floating-Point Arithmetic (IEEE 754)
is a technical standard for floating-point computation
established in 1985 by the Institute of Electrical and
Electronics Engineers (IEEE).

A single precision IEEE 754 floating point is a 32 bit word
A double precision IEEE 754 floating point is 64 bit word.

A single precision FP consists of a one bit algebraic sign,
an 8 bit exponent and a 23 bit mantissa.

Floating point calculations can be done in hardware or software.

Floating point is widely used for Process Automation
Controllers (PAC) and in DCS controllers.

Double precision is frequently used in flow computers.
Single precision is typically the standard for other data an
operations. Single precision floating point is widely used
by serial data communication protocols like Modbus.

Carl Ellis
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