turck BL20 Series - Page 504

Appendix
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502
Temperature- and resistance values (BL20-2AI-PT/NI-2/3)
The hexadecimal/binary values for the negative value range cannot easily be converted into deci-
mal values, because the values are coded as two’s complement.
All numerical values from 000
hex
… 7FF
hex
represent positive values when coded as two’s comple-
ment. Values in this range can easily be converted into decimal values. This is also relevant for binary
numbers in which the most significant bit (bit 16) is ”0”.
All numerical values from 800
hex
…FFFF
hex
represent negative values when coded as two’s comple-
ment. This is also relevant for binary numbers in which the most significant bit (bit 12) is ”1”.
The conversion into a decimal number is shown in the following:
 Example of the conversion of negative numerical values. S. 496
The temperature values can now be calculated according to the parameterization.
 The first equation is 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”
The value range:
-200 °C…-0,5°C
is displayed as follows:
E70
hex…
FFF
hex
(decimal: -400…-1)
The value range:
0 °C…850°C
is displayed as follows:
000
hex
…6A4
hex
(decimal: 0…1700)
 The second equation is for the parameterization:
”Pt100, -200…150°C”
”Ni100, -60…150°C”
”Pt200, -200…150°C”
”Pt500, -200…150°C”
”Pt1000, -200…150°C”
”Ni1000, -60…150°C”
Temperature value = 0.5 °C × decimal value
Temperature value = 0.1 °C × decimal value