Siemens SIMATIC ET 200AL, System Manual

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Representation of analog values
3.1 Overview
Analog value processing
Function Manual, 06/2014, A5E03461439-AC
61
Example
The following example shows how the least significant digits are padded with "0" values:
●
The module with 16-bit resolution is capable of incrementing the values in steps of one
unit (2
0
= 1).
● The module with 13-bit resolution is capable of incrementing the values in steps of 8 units
(2
3
= 8).
Table 3- 2 Example: Bit pattern of a 16-bit and 13-bit analog value
Resolution Analog value
Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
16-bit S 2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
13-bit S 2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
0 0 0
S = sign
Note
For information on the resolution supported by each analog module, please refer to the
technical data for the relevant module.