Temperature acquisition
module XIOC-4T-PT
05/02 AWB2725-1452GB
16
Data evaluation
Range 1: –50 to +400 °C (Pt100/Pt1000)
The temperature is converted into a signed 15 bit value. The
weighting of the bits can be seen in the following diagram.
Example 1
If you enter these bit values in the table above, the result is the
following value:
–800 + 400 + 200 + 100 + 50 = –50 °C
Example 2
25 + 12.5 = 37.5 °C
If the measured value for the temperature lies outside the range
(< –51 °C or > 410 °C), then the data value is displayed as
7FFF
hex
.
The relationship between temperature and the measured value is
shown by the following equation and the diagram.
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
°C
–800 200 50 12.5 3.125 0.781 0.195 0.0488
400 100 25 6.25 1.563 0.391 0.0977 0.0244
F800
hex
=1111 1000 0000 0000
F
hex
8
hex
0
hex
0
hex
0600
hex
=0000 0110 0000 0000
0
hex
6
hex
0
hex
0
hex
Temperature
(°C)
=
Decimal value, e.g. 256 (0100
hex
)
= 6.26 (°C)
40.96
Figure 20 : Temperature/measurement diagram
4000
hex
3000
hex
2000
hex
1000
hex
0800
hex
50
0
50
100
200
300
400
[˚C]
F800
hex
Value
