Pilz PSSu E S 2AI RTD - Manual (Page 18)

Function description
Operating Manual PSSu E S 2AI RTD(­T)
22017­EN­06 18
4.2.7 Data formats
The way in which the analogue value is displayed depends on the measuring 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 16 bits.
} 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. The values in the following tables apply with default scal­
ing.
Analogue value and typical digital value with a measuring range of ­100 °C ... +100
°C, two's complement:
Temperature Decimal digital value Binary digital value
Hexadecimal digital
value
­100 °C ­1000 1111 1100 0001 1000 FC18
H
0 °C 0 0000 0000 0000 0000 0000
H
100 °C 1000 0000 0011 1110 1000 03E8
H
Analogue value and typical digital value with a measuring range of ­100 °C ... +100
°C, sign and magnitude representation:
Temperature Decimal digital value Binary digital value
Hexadecimal digital
value
­100 °C ­1000 1000 0011 1110 1000 83E8
H
0 °C 0 0000 0000 0000 0000 0000
H
100 °C 1000 0000 0011 1110 1000 03E8
H
With resistance measurement, data is always transmitted with 16 bits as positive values.
Analogue value and typical digital value with a measuring range of 0 Ohm ...
1000 Ohm:
Resistance Decimal digital value Binary digital value
Hexadecimal digital
value
0 Ohm 0 0000 0000 0000 0000 0000
H
1000 Ohm 10000 0010 0111 0001 0000 2710
H
Range limits:
Measurement type Lower range limit Upper range limit
Two's complement Sign and magnitude rep­
resentation Two's complement/sign
and magnitude repres­
entation
Temperature 8001
H
FFFF
H
7FFF
H
Resistance 0000
H
0000
H
FFFF
H