Pilz PSSu E S 2AI U - Manual (Page 20)

Function description
Operating Manual PSSu E S 2AI U(­T)
21405­EN­03 20
4.2.5 Data formats
The way in which the analogue value is displayed depends on the voltage 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.
Analogue value and typical digital value with a voltage range of 0 ... two's comple­
ment 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
Analogue value and typical digital value with a voltage range of ­10 V ... +10 V, two's
complement:
Analogue value of
voltage
Decimal digital value Binary digital value
Hexadecimal digital
value
­10 V ­32 767 1000 0000 0000 0001 8001
H
­5 V ­16 384 1100 0000 0000 0000 C000
H
­2.4 mV (= 1 LSB) ­8 1111 1111 1111 1000 FFF8
H
0 V 0 0000 0000 0000 0000 0000
H
10 V 32 767 0111 1111 1111 1111 7FFF
H
Analogue value and typical digital value with a voltage range of ­10 V ... +10 V, sign
and magnitude representation:
Analogue value of
voltage
Decimal digital value Binary digital value
Hexadecimal digital
value
­10 V ­32 768 1111 1111 1111 1111 FFFF
H
­5 V ­16 384 1011 1111 1111 1111 BFFF
H
­2.4 mV (= 1 LSB) ­8 1000 0000 0000 0100 8008
H
0 V 0 0000 0000 0000 0000 0000
H
10 V 32 767 0111 1111 1111 1111 7FFF
H