Technical Specifications
7-94
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
7.21.4
Analog value representation for measuring ranges with
SIMATIC S5
Analog value representation
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 analog values are represented in the form of a twos complement.
Analog inputs
The following table shows the analog value representation of the expansion
modules with analog inputs:
Table 7-50 Analog value representation of the analog inputs (SIMATIC S5 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
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
x
F
Ü
Sign
The sign (+/–) of the analog value is always in bit number 15:
”0”
”1”
Irrelevant bits
Irrelevant bits are marked ”x”.
Diagnostic bits
Bit numbers 0 and 1 are reserved for diagnostic functions, whereas bit number 2
does not have a function.
E = error bit (0 = no wire break; 1 = wire break)
O = overflow bit
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 ...
