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7. Collection of Temperate Data
7-2
7.2 Temperature Data
(1) Content of temperature conversion data [range : -50 to +400 °C] (Pt100/ Pt1000)
The meaning of the each bit( b0 to b15) of temperature conversion data (in WX**) is as shown
below.
The sum of the bit “1” is the measured temperature.
<For example>
(1) HF800 = 1111 1000 0000 0000"
(HF) (H8) (H0) (H0)
-800 + 400 + 200 + 100 + 50 = -50 °C
(2) H0600 = 0000 0110 0000 0000"
(H0) (H6) (H0) (H0)
25 + 12.5 = 37.5 °C
When an input error occurs( below -51°C and over 410 °C), the temperature conversion data is
H7FFF.
The following relation exits between temperature conversion data and actual temperature.
Temperature ( ) =
Note) “b0” is always “0” in normal time.
Relation between the temperature and temperature conversion data
Figure 7.3
)Temperature conversion data(hexadecimal) -50 to +400 °C
H4000
H3000
H2000
H1000
H0800
-50
0
50
100 200
300
400
HF800
Temperate(°C)
b15
b14
b13
b12
b11
b10
b9
b8
b7
b5
b6
b4
b3
b2
b1
b0
°C
-800
400
200
100
50
25
12.5
6.25
3.125
1.563
0.781
0.391
0.195
0.0977
0.0488
0.0244
Note)
Temperature conversion data(signed decimal data)
40.96