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Analog modules
5.4 Representation of analog values
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
201
5.4.9 Representation of analog values for analog output channels
Introduction
The tables in this section contain the analog value representation for output channels of the
analog output modules. The values in the tables apply to all modules with the corresponding
output ranges.
Notes for readers of the tables
The tables "Bipolar output ranges", "Unipolar output ranges", "Life-zero output ranges"
contain the binary representation of the measured values.
Since the binary representation of the output values is always the same, starting with the
table at "Representation of Analog Values in the Voltage Output Range ± 10 V" these tables
only contain the output ranges and the units.
Binary representation of output ranges
The input ranges shown in tables "Bipolar output ranges", "Unipolar output ranges", "Life-
zero output ranges" are defined in complementary 2-by-2 representation:
Table 5- 31 Bipolar output ranges
Units Output
value in
%
Data word Range
2
15
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
≧3251
2
0 % 0 1 1 1 1 1 1 1 x x x x x x x x Overflow
32511 117,589 0 1 1 1 1 1 1 0 1 1 1 1 1 1 1 1
27649 ≧100,004 0 1 1 0 1 1 0 0 0 0 0 0 0 0 0 1
Overshoot
range
27648 100,000 0 1 1 0 1 1 0 0 0 0 0 0 0 0 0 0
1 0,003617 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
0 0,000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
- 1 -
0,003617
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
-
27648
-100,000 1 0 0 1 0 1 0 0 0 0 0 0 0 0 0 0
Nominal
range
-
27649
≤100,004 1 0 0 1 0 0 1 1 1 1 1 1 1 1 1 1
-
32512
-117,593 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0
Undershoot
range
≤ 3251
3
0 % 1 0 0 0 0 0 0 0 x x x x x x x x Underflow
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