Siemens Simatic M7-400 Reference Manual page 224

Analog Modules
Example
In the following example you can see how the positions not padded with "0" are
written for low resolution.
Table 5-4 Example: Bit Pattern of a 16-Bit and a 13-Bit Analog Value
Resolution
Bit
16-bit analog value
13-bit analog value
5.3.1 Analog Value Representation for Analog Input Channels
Introduction
The tables in this chapter 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
Tables 5-6 to 5-8 contain the binary representation of the measured values.
Since the binary representation of the measured values is always the same,
starting at 5-9 these tables only contain the measured values and the units.
Measured-Value Resolution
The resolution of the analog values can differ depending on the analog module and
its parameter assignment. With resolutions < 16 bit, the bits marked with "x" are set
to "0".
Note: This resolution doesn't apply to temperature values. The changed
temperature values are the result of recalculation in the analog module
(see Tables 5-16 to 5-30).
5-8
15 14 13 12 11 10
0 1 0 0 0 1
0 1 0 0 0 1
S7-400, M7-400 Programmable Controllers Module Specifications
Analog Value
9 8 7 6 5 4
1 0 0 1 1 1
1 0 0 1 1 1
3 2 1 0
0 0 1 1
0 0 0 0
A5E00069467-07