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

I/O device analog input/output
11.1 I/O device analog input
11.1.4

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 11- 4 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" → -
11.1.5

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
160
Analog value
15 14 13 12
Sig 2 2 2
14 13 12
n
Units
Decimal Hexadecimal
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
7FFF Overflow
H
7EFF Overrange
H
6C01
H
6C00 Nominal range
H
5100
H
0001
H
0000
H
FFFF Underrange
H
ED00
H
7FFF Wire break
H
8000 Underflow
H
Operating Instructions, 06/2009, A5E01250250-04
6 5 4 3
2 2 2 2
7 6 5 4 3
Range
2 1 0
2 2 2
2 1 0
ET 200eco PN