Siemens SIMATIC ET 200C, Manual

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12-37
ET 200C Distributed I/O Station
EWA 4NEB 812 6119-02b
The analog values of ET 200C; AO 4 12 Bit for SIMATIC S5 are
presented as complements of twos.
The table below shows the analog value presentation for ET 200C;
AO 4
12 Bit:
Table 12-30 Presentation of an Analog Input Value as Bit Pattern for ET 200C; AO 4 12 Bit
High byte Low byte
Bit number 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Analog value
presentation DT 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 X X
Bits 0 ... 3 and 15 are without significance for the amount of the measured
value. These bits are described in detail in Table 12-31.
Bits 0 ... 2 and 15 in the bit pattern of the analog input value have the follow-
ing significance:
Table 12-31 Description of bits for ET 200C; AO 4 12 Bit
Bit Significance Signal state Significance of the
signal state
DT Sign 0 Sign “+”
1 Sign “–”
X Irrelevant – –
Analog Value
Presentation,
SIMATIC S5
Supplementary
Bits
Analog Modules