turck BL20 Series - Page 498

Appendix
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496
Example of the conversion of negative numerical value
The following parameterization is used in the example:
”Pt100, -200…150°C”
The temperature is thus calculated with the factor 0.01 (see below).
The example explains the general procedure to convert a hexadecimal or binary number coded as
two’s complement to a decimal number.
The hexadecimal value should be ”B344”.
1 The binary value is:
B344  1011.0011.0100.0100
2 Invert the binary number:
1011.0011.0100.0100  0100.1100.1011.1011
3 Add a ”1”to the inverted binary number:
0100.1100.1011.1011
0000.0000.0000.0001
0100.1100.1011.1100
4 Convert the binary number into a decimal number:
0100110010111100  19644
5 The temperature value is calculated as follows:
temperature value = 0.01 °C × decimal value = 0.01 °C (-19644) = -196.44 °C
The temperature values can now be calculated according to the parameterization.
 For the parameterization
”Pt100, -200…850°C”
”Ni100, -60…250°C”
”Pt200, -200…850°C”
”Pt500, -200…850°C”
”Pt1000, -200…850°C”
”Ni1000, -60…250°C”
use the equation:
temperature value = 0.1 °C × decimal value
The value range:
-200 °C…-0,1°C
is displayed as follows:
F830
hex…
FFFF
hex
(decimal: -2000…-1)
The value range:
0 °C…850°C
is displayed as follows:
0000
hex…
2134
hex
(decimal: 0…8500)