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14.1.2
Analog Value Representation for Measuring Ranges with
SIMATIC S7
Analog Value Representation
With the same nominal range, the digitized analog value is the same for input and
output values. Analog values are represented in two's complement.
The following table shows the analog value representation of the analog
electronics modules.
Table 14-3
Analog Value Representation (SIMATIC S7 Format)
Resolution
Bit number
15
Place values of the
S
bits
Sign
The sign (S) of the analog value is always in bit number 15:
• "0" = +
• "1" = -
Examples
Table 14-4
decimal
-1
-32768
Measured Value Resolution
The following table shows the representation of the binary analog values and the
corresponding decimal and hexadecimal representation of the units of the analog
values.
ET 200iS Distributed I/O Station
A5E00087831-02
14
13
12
11
10
14
13
12
11
10
2
2
2
2
2
Examples
Analog Value
1111 1111 1111 1111
1000 0000 0000 0000
Analog Electronics Modules
Analog Value
9
8
7
6
5
9
8
7
6
5
2
2
2
2
2
binary
4
3
2
1
0
4
3
2
1
0
2
2
2
2
2
hexadecimal
FFFF
H
8000
H
14-3
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