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Analog Value Representation for
Measuring Ranges with SIMATIC S5
Analog Value Representation
The analog inputs have a resolution of 11 bits + sign (S) or 12 bits + sign (S),
whereas the analog outputs have a resolution of 11 bits + sign (S). Each analog
value is entered in the accumulator with left justification.
Analog values are represented in twos complement.
Analog Inputs
The following table shows the analog value representation of the analog electronic
modules with analog inputs. For the lower resolutions, the lower bits are filled
with "0".
Table 1
Analog Value Representation of the Analog Inputs (SIMATIC S5 Format)
Resolution
Bit number
Significance of the bits
Sign
The sign (S, +/–) of the analog value is always in bit number 15:
"0" ³ )
"1" ³ *
Irrelevant Bits
Irrelevant bits are marked "x".
24
15
14
13
12
11
11
10
9
8
S
2
2
2
2
10
9
8
7
S
2
2
2
2
Analog Value
10
9
8
7
6
7
6
5
4
3
2
2
2
2
2
6
5
4
3
2
2
2
2
2
2
5
4
3
2
1
2
1
0
2
2
2
x
E
1
0
2
2
x
x
E
Product information
A5E00236831-04
0
O
O
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