Technical Specifications
7-87
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
7.21.2
Analog value representation for measuring ranges with
SIMATIC S7
Analog value representation
The digitized analog value for input and output values in the same rated range is
the same.
The analog values are represented in the form of a twos complement.
The following table shows the analog value representation of the expansion
modules with analog inputs and outputs:
Table 7-43 Analog value representation (SIMATIC S7 format)
Resolution
Analog value
Bit number
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Significance of the bits
+/
–
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
Sign
The sign (+/–) of the analog value is always in bit number 15:
”0”
”1”
Measured-value resolution
In the table below you will find the representation of the binary analog values and
the associated decimal and hexadecimal representation of the units of the analog
values.
The analog inputs have a resolution of 12 bits + plus/minus sign, whereas the
analog outputs have a resolution of 11 bits + plus/minus sign. Each analog value is
entered in the accumulator with left justification. The bits marked ”x” are set to ”0”.
Note: This resolution does not apply to temperature values. The converted
temperature values are the result of a conversion in the expansion module (see
Table 7-47).
Table 7-44 Measured-value resolution of the analog values (SIMATIC S7 format)
Units
Analog value
Resolution in
bits (plus +/–)
Decimal
Hexadeci-
mal
High byte
Low byte
11
16
10
H
+/– 0 0 0 0 0 0 0
0 0 0 1 x x x x
12
8
8
H
+/– 0 0 0 0 0 0 0
0 0 0 0 1 x x x
Summary of Contents for SIMATIC ET 200X
Page 8: ...Preface viii ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 20: ...Contents xx ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 40: ...Product Overview 1 20 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 58: ...Configuration Options 2 18 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 80: ...Installation 3 22 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 124: ...Configuration Options 2 18 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 328: ...Order Numbers A 10 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 348: ...Dimesioned Drawings and Pinouts C 18 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
Page 362: ...Index Index 8 ET 200X Distributed I O Device EWA 4NEB 780601602 06 ...
