turck BL20 Series - Page 506

Appendix
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504
Temperature- and voltage values (BL20-2AI-THERMO-PI)
Before using the equation below, the hexadecimal or binary value has to be converted into a deci-
mal value. The value is contained in the 3 more significant digit positions of the hexadecimal num-
ber or in the 12 more significant bits of the binary number.
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:
 s. S. 496.
The temperature and voltage values can now be calculated according to the parameterization.
For the parameterization
 ”Type K, -270…1370°C”
 ”Type B, +100…1820°C”
 ”Type E, -270…1000°C”
 ”Type J, -210…1200°C”
 ”Type N, -270…1300°C”
 ”Type R, -50…1760°C”
 ”Type S, -50…1540°C”
 ”Type T, -270…400°C”
use the equation:
The value range:
-270 °C…1820°C
is displayed as follows:
EF2
hex
…71C
hex
(decimal: -270…1820)
For the parameterization ”±50mV”:
For the parameterization ”±100mV”:
For the parameterization ”±500mV”:
For the parameterization ”±1000mV”:
Temperature value = 1 °C × decimal value
voltage value = 0.02443 mV x decimal value
voltage value = 0.04885 mV x decimal value
voltage value = 0.24426 mV x decimal value
voltage value = 0.488523 mV x decimal value