Pilz PSSu E S 2AO I - Manual (Page 18)

4.2 Configuration
4 Function description
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4-2
4.2 Configuration 4200 Configuration 4- ][Funktionsbeschreibung_BA_Konfig Feldbus
There are three options for configuring the module:
 Via a fieldbus without the modular device description file
Without the modular device description file it is only possible to con-
figure the input or output range. All other configuration details have
default values.
 Via a fieldbus with the modular device description file
With a modular device description file it is possible to configure all the
values.
 Via the USB port of the head module, using the PSSuniversal Config-
urator
All the values can be configured using the PSSuniversal Assistant.
Any configuration via the USB port will overwrite the configuration
made via the fieldbus.
If a module has been configured via the head module's USB port, it is
locked and cannot be overwritten by the fieldbus. This lock can be de-
activated again in the PSSuniversal Configurator.
4.2.1 Current range
Current range 4- ][Funktionsbeschreibung_BA_Konfig Bereich ST-Aus 2xI
You can configure the following current ranges per module:
 0 ... 20 mA single-pole, referenced to earth (single-ended)
 4 ... 20 mA single-pole, referenced to earth (single-ended)
4.2.2 Data formats
Data formats 4- ][Funktionsbeschreibung_BA_Konfig Format ST-Aus 2xI
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.