D300717 1211 - BL20 I/O modules
14-9
Analog value representation (analog input modules)
The value range
0 V to 10 V
is displayed as follows:
0000
hex
to 7FFF
hex
(decimal: 0 to 32767)
14.1.2
Equations for 12-bit-representation
Current values from 0 to 20 mA
The value range
0 mA to 20 mA
is displayed as follows:
000
hex
to FFF
hex
(decimal: 0 to 4095)
The current values can now be calculated by means of the following equation:
Current values from 4 to 20 mA
The value range
4 mA to 20 mA
is displayed as follows:
000
hex
to FFF
hex
(decimal: 0 to 4095)
The current values can now be calculated by means of the following equation:
Attention
The 12-bit-representation is "left-justified". The value is transmitted with 16 bit. The last 4
digits of the binary number or respectively the last digit position
of the hexadecimal value are
used as diagnostic bits!
Note
Before using the following equations, the hexadecimal or binary value always has to be
converted into a decimal value.
The value is contained in the 3 more significant digit positions of the hexadecimal number or
in the 12 more significant bits of the binary number.
Note
In the 12-bit-representation only the 3 more significant digit positions of the hexadecimal
number or the 12 more significant bits of the binary number are used for the calculation of
the decimal value.
value
decimal
V
4
10
3,052
value
voltage
×
−
×
=
value
decimal
mA
3
10
4,88
value
current
×
−
×
=
4mA
value
decimal
mA
3
10
3,91
value
current
+
×
−
×
=
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