Moeller Marine XI/OC SIGNAL MODULES 05/02 AWB2725-1452GB User Manual
05/02 AWB2725-1452GB
17
Range 2: –20 to +40 °C (Pt100)
The temperature is converted into a signed 15 bit value. The
weighting of the bits can be seen in the following diagram.
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:
following value:
–80 + 40 + 20 = –20 °C
Example 2
2.5 + 1.25 = 3.75 °C
If the measured value for the temperature lies outside the range
(< –25 °C or > 45 °C), then the data value is displayed as 7FFF
(< –25 °C or > 45 °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.
shown by the following equation and the diagram.
Conversion tables
Table 5:
Conversion table for Pt100 (–20 to +40 °C)
b15
b14
b13
b12
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0
°C
-80
20
5
1.25
0.312
0.078
0.019
0.005
40
10
2.5
0.625
0.156
0.0390
0.01
0.002
E000
hex
= 1 1 1 0
0 0 0 0
0 0 0 0
0 0 0 0
E
hex
0
hex
0
hex
0
hex
0600
hex
= 0 0 0 0
0 1 1 0
0 0 0 0
0 0 0 0
0
hex
6
hex
0
hex
0
hex
Temperature
(°C)
(°C)
=
Decimal value, e.g. 256 (0100
hex
)
= 0.626 (°C)
409.6
Figure 21 : Temperature/measurement diagram
4000
hex
3000
hex
2000
hex
1000
hex
0800
hex
–20
0
5
10
20
30
40
E000
hex
[˚C]
Value
Temperature
(ºC)
(ºC)
1)
Decimal
value
value
Hexadecimal
value
value
Pt100
resistance
(O)
resistance
(O)
-25
55296
D800
90.19
-20
57344
E000
92.16
-15
59392
E800
94.12
-10
61440
F000
96.09
-5
63488
F800
98.04
0
0
0000
100.00
5
2048
0800
101.95
10
4096
1000
103.90
15
6144
1800
105.85
20
8192
2000
107.79
25
10240
2800
109.73
30
12288
3000
111.67
35
14336
3800
113.61
40
16384
4000
115.54
45
18432
4800
117.47
1) The technical data refer to the range from
–20 to 40 ºC.