D300529 0115 - BL67 I/O modules
15-13
Analog value representation (analog input modules)
"Resistance, 0 … 400 Ohm":
Resistance value = 0,01221
Ω
× decimal value
"Resistance, 0 … 1000 Ohm":
Resistance value = 0,03052
Ω
× decimal value
Temperature- and voltage values (BL67-2AI-TC)
Before using the equation below, the hexadecimal or binary value has to be converted into a decimal
value.
The hexadecimal/binary values for the negative value range cannot easily be converted into decimal
values, because the values are coded as two’s complement (→
page 15-9).
All numerical values from 0000
hex
to 7FFF
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 8000
hex
to 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 16) is "1". Please see
→
Example of the conversion of negative numerical value, page 15-10.
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:
temperature value = 0,01 °C × decimal value
The value range:
-270 °C to -0,1°C
is displayed as follows:
F574
hex
to FFFF
hex
(decimal: -2700 to -1)
The value range:
0 °C to 1820 °C
is displayed as follows:
0000
hex
to 4718
hex
(decimal: 0 to 18200)
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