Representation Of Analog Values Of Analog Input Channels - Siemens SIMATIC S7-400 Reference Manual

5.4.2

Representation of analog values of analog input channels

Introduction
The tables in this section contain the measured value representations for the various
measuring ranges of the analog input modules. The values in the tables apply to all modules
with the corresponding measuring ranges.
Notes for readers of the tables
The tables "Bipolar input ranges", "Unipolar input ranges", "Life-zero input ranges" contain the
binary representation of the measured values.
The binary representation of the measured values is always the same, so the analog
representation tables only compare the measuring ranges and the units.
Measured value resolution
The resolution of the analog values may differ, based on the analog module and module
parameters. At resolutions < 16 bits, all bits identified by "x" are set to "0".
Note
This resolution does not apply to temperature values. The converted temperature values are
the result of a conversion in the analog module (see tables for analog representation of
resistance thermometer and for thermometer elements).
Table 5-5
Resolution in bits
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
Supported analog value resolutions
Unit decimal
9 128
10 64
11 32
12 16
13 8
14 4
15 2
16 1
5.4 Representation of analog values
Unit hexadecimal Analog value
80 0 0 0 0 0 0 0 0
H
40 0 0 0 0 0 0 0 0
H
20 0 0 0 0 0 0 0 0
H
10 0 0 0 0 0 0 0 0
H
8 0 0 0 0 0 0 0 0
H
4 0 0 0 0 0 0 0 0
H
2 0 0 0 0 0 0 0 0
H
1 0 0 0 0 0 0 0 0
H
Analog modules
Analog value
High byte Low byte
1 x x x x x x x
0 1 x x x x x x
0 0 1 x x x x x
0 0 0 1 x x x x
0 0 0 0 1 x x x
0 0 0 0 0 1 x x
0 0 0 0 0 0 1 x
0 0 0 0 0 0 0 1
169