Specifications

Analog Output Modules
31007715 6/2008 273
Output
Data Registers
Each STB AVO 1255 data register represents the output 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 results in an output of 10 V. If the sign bit (bit 15) is set, the
output is set to 0 V.
Linear voltage representations can be interpreted using the formula:
where Cn is the numerical count and Vao is the analog output voltage. Voltage data
is represented as follows:
Values greater than 32 000 do not produce over-range indications.
2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
ignored
0 to 10 V Data Register Format
1
2
34567
91011
12
13
14
15
0
8
always 0
C
n
3200 V
ao
×=
V
C
32 736
32 000
9V
10.23 V
10 V
28 800
ao
n
0
3200
1V
2V
6400
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