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AXL F AI4 I 1H

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15.2

Measured value in extended float format

(0082

hex: Measured Value Float)

You can read the IN process data in IB IL or S7-compatible

format with the 0025

hex object.

The 0082

hex object is also available.

This object provides the measured value in the highest inter-

nal accuracy of the terminal in the float format.

Measured value channel 1 ... channel 4

Structure of the float format according to IEEE 754 in the bit

representation:

Some example values for conversion from floating point to

hexadecimal representation:

Extended Float Format

Extended Float Format is a specially defined format. It con-

sists of the measured value in float format, a status, and a

unit.

Status is necessary because the float format defines no pat-

terns providing information on the status of the numerical

value.

The status corresponds to the LSB of the diagnostic code in

IB IL format (e.g., overrange: status = 01, diagnostic code =

8001

hex). If status = 0, the measured value is valid.

0082

hex: Measured Value Float (Read)

Subindex

Data type

Length in

bytes

Meaning

Array of Re-

cords

4 * 6

Read all ele-

ments

Record

Measured value

for channel 1

Record

Measured value

channel 4

Element

Data type

Length in

bytes

Meaning

Float 32

Measured value

in float format

according to

IEEE 754

2Unsigned 8

Status

3Unsigned 8

Unit

VEEE EEEE

EMMM

MMMM

1 sign bit, 0: positive, 1: negative

8 bits exponent with offset 7F

hex

23 bits mantissa

Floating point

Hexadecimal representa-

tion

1.0

3F 80 00 00

10.0

41 20 00 00

1.03965528

3F 85 13 6D

- 1.0

BF 80 00 00

Unit

Code

Milliampere (mA)

39 (27

hex)

Status

Code

Measured value is valid

hex

Measured value is invalid

Other

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