Pilz PSSu E S 4AI U - Manual (Page 25)

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4-9
4.2 Configuration
4 Function description
Conversion of analogue limit values into decimal values (n) for the
system software:
n = 32 768 * U
Limit
/ 10 V
Key:
U
Limit
: Analogue value at the input
Example:
 Voltages at the input, which are to be monitored through the limit val-
ues:
– Limit value 1 is to be 8 V.
– Limit value 2 is to be 5 V.
 Entry in the system software:
– Limit value 1 corresponds to 26 214
– Limit value 2 corresponds to 16 384
4.2.3 Data formats
Data formats 4- ][Funktionsbeschreibung_BA_Konfig Format ST-Ein 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.
The module uses the following data format:
 Two's complement (default)
The digital values are transferred with 15 bits plus a sign bit (MSB).
The MSB is always "0" with positive numbers.
Analogue value and typical digital value with two's complement re-
presentation:
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