Siemens SIMATIC ET 200S Manual - Halaman 24

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Siemens SIMATIC ET 200S Manual
Analog value representation
4.2 Analog value representation for measuring range with SIMATIC S7
Measured value resolution
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 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
Measured value resolution of the analog values (SIMATIC S7 format)
Resolution in bits
11+S
12+S
13+S
15 + sign
Note
This resolution does not apply to temperature values. The converted temperature values are
the result of a conversion in the analog electronic module.
Note
The following applies with temperature measurements: When leaving the linearized nominal
range, the existing gradient of the characteristic curve is retained in the overflow and
underflow range.
24
Units
Decimal
Hexadecimal
16
10
H
8
8
H
4
4
H
1
1
H
Analog value
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
2AI RTD HF analog electronic module (6ES7134-4NB51-0AB0)
Manual, 05/2007, A5E01076876-02
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