Specifications

Analog Input Modules
31007715 6/2008 49
Input Data
Registers
Each STB AVI 1255 data register represents the input voltage of a channel in the
IEC data format. The data has 10-bit resolution. The bit structure in each data
register is as follows:
There are 10 significant bits in each data word—bits 14 through 5. They allow you
to represent voltage data with integer values ranging from 0 to +32 736 in
increments of 32. A value 32 000 represents an input of 10 V.
Linear voltage is interpreted using the formula:
where Cn is the numerical count and Vai is the analog input voltage.
A value above 32 000 does not produce an over-range indication.
8
0
2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
always 0
STB AVI 1255 Data Register Format
12 3
45
67
910111213
14
15
always 0
2
5
V
ai
C
n
3200⁄=
V
32 736
32 000
9V
1
0.23 V
10 V
28 800
ai
C
n
0
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