Siemens SIMATIC ET 200S User Manual - Page 18

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Siemens SIMATIC ET 200S User Manual
Analog value representation
4.2 Analog value representation for measuring range with SIMATIC S7
Output value
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.
The table below shows the resolutions 11, 12, 13, and 15 bit + sign. Each analog value is
entered left aligned in the ACCU. The bits marked with "x" are set to "0".
Table 4-2
Output values (SIMATIC S7 format)
Resolution in bits
11+S
12+S
13+S
15 + sign
Introduction
The following tables contain the digitized analog values for the measuring ranges of the
analog input modules.
Since the binary representation of the analog values is always the same, these tables only
compare the measuring ranges with the units.
Voltage measuring ranges: ±5 V , ±10 V
Table 4-3
SIMATIC S7 format: Measuring ranges ±5 V and ±10 V
Measuring range ±5 V
> 5,8794
5,8794
:
5,0002
5,00
3,75
:
-3,75
-5,00
-5,0002
:
-5,8796
< -5,8796
18
Units
Decimal
Hexadecimal
16
10
H
8
8
H
4
4
H
1
1
H
Measuring range
±10 V
> 11,7589
11,7589
:
10,0004
10,00
7,50
:
-7,50
-10,00
-10,0004
:
-11,759
< -11,759
High byte
S 0 0 0 0 0 0 0
S 0 0 0 0 0 0 0
S 0 0 0 0 0 0 0
S 0 0 0 0 0 0 0
Units
Decimal
Hexadecimal
32767
7FFF
32511
7EFF
:
27649
6C01
27648
6C00
20736
5100
:
-20736
AF00
-27648
9400
-27649
93FF
:
-32512
8100
-32768
8000
2AI U HF analog electronic module (6ES7134-4LB02-0AB0)
Analog value
Low byte
0 0 1 x x x x
0 0 0 1 x x x
0 0 0 0 1 x x
0 0 0 0 0 0 1
Range
Overflow
H
H
:
Overshoot range
H
H
H
:
Nominal range
H
H
H
:
Underrange
H
Underflow
H
Manual, 04/2007, A5E01076007-01