turck BL20 Series - 17.2 Analog value representation (analog output modules); 17.2.1 Resolution of analog value representations; 17.2.2 Equations for 16-bit representation

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2020/09
17.2 Analog value representation (analog output modules)
17.2.1 Resolution of analog value representations
In the bipolar mode the digitalized analog values are represented as a two’s complement. The 16 bit
or the 12-bit-representation (left justified) can be chosen by setting the respective module param-
eter.
17.2.2 Equations for 16-bit representation
Current values from 0 bis 20 20 mA
The decimal values for the current values from 0…20 mA can be calculated by means of the follow-
ing equation:
decimal value = 2047.9375 1/mA × current value - 8191.75
The value range:
0…20 mA
is displayed as follows:
0000
hex
…7FFF
hex
(decimal: 0…32767)
The decimal value can easily be converted into a hexadecimal value, because all numbers belong to
the positive range of the two’s complement.
Current values from 4…20 mA
The decimal values for the current values from 4…20 mA can be calculated by means of the follow-
ing equation:
decimal value = 2047.9375 1/mA × current value - 8191.75
The value range:
4…20 mA
is displayed as follows:
0000
hex
…7FFF
hex
(decimal: 0…32767)
The decimal value can easily be converted into a hexadecimal value, because all numbers belong to
the positive range of the two’s complement.