Analog Value Representation For Measuring Ranges With Simatic S7; Measuring Ranges Of The Analog Input Device In S7 Format - Siemens SIMATIC ET 200eco PN Operating Instructions Manual
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- Operating instructions manual (278 pages) ,
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I/O device analog input/analog output
10.1 I/O device analog input
10.1.5
Analog value representation for measuring ranges with SIMATIC S7
Representation of analog values
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 representation of analog values of the analog input.
Table 10- 6
Representation of analog values (SIMATIC S7 format)
Resolution
Bit number
Significance of the bits
Sign
The sign (S) of the analog value is always in bit number 15:
● "0" → +
● "1" → -
10.1.6
Measuring ranges of the analog input device in S7 format
Voltage measuring ranges: Measuring range 1 to 5 V
Measuring range
1 to 5 V
> 5.704 V
5.704 V
5 V
4 V
1 V + 144.7 µV
1 V
0.296 V
< 0.296 V
182
Analog value
15
14
13
12
Sig
2
2
2
14
13
12
n
Decimal
32767
32511
27649
27648
20736
1
0
-1
-4864
32767
- 32768
11
10
9
8
7
2
2
2
2
2
11
10
9
8
7
Units
Hexadecimal
7FFF
H
7EFF
H
6C01
H
6C00
H
5100
H
0001
H
0000
H
FFFF
H
ED00
H
7FFF
H
8000
H
Operating Instructions, 08/2016, A5E01250250-AJ
6
5
4
3
2
2
2
2
2
2
6
5
4
3
2
Range
Overflow
Overrange
Nominal range
Underrange
Wire break
Underflow
ET 200eco PN
1
0
2
2
1
0
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