Pilz PSSu E S 4AO U - Manual (Page 24)

4.2 Configuration
4 Function description
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4-8
4.2.2 Data formats
Data formats 4- ][Funktionsbeschreibung_BA_Konfig Format ST-Aus 4xU
The way in which the analogue value is displayed depends on the volt-
age range, on scaling and on the data format. The following examples
show the relationship between the values with default scaling.
You can configure the following data formats:
 Two's complement (default)
The digital values are transferred with 15 bits plus a sign bit (MSB).
The MSB is "1" with negative values and "0" with positive values.
 Sign and magnitude representation
The digital values are transferred with 15 bits plus a sign bit (MSB).
The MSB is "1" with negative values and "0" with positive values. With
negative values there is a distinction between sign and magnitude
representation and two's complement representation.
 Formation of magnitude option
Negative digital values are converted into positive values of equal
magnitude.
As the module's resolution is 12 bits plus sign bit, the three least signif-
icant bits have no significance for the analogue value.
Analogue value and typical digital value, two's complement or sign
and magnitude representation:
Analogue value of voltage Decimal digital value Binary digital value Hexadecimal digital value
0 V 0 0000 0000 0000 0000 0000
H
5 V 16 384 0100 0000 0000 0000 4000
H
10 V 32 767 0111 1111 1111 1111 7FFF
H