Siemens SIPART DR24 Manual page 16

1 Technical Description
1.4 Function Principle
1.4.2 Description of the Option Module
6DR2800-8V UNI module
D Direct connection of thermocouple or Pt100 sensors, resistance or mV transmitters
Measured value sensors such as thermocouples (TC), resistance thermometers Pt100 (RTD),
resistance transmitters (R) or voltage transmitters in the mV range can be connected directly.
The measuring variable is selected by configuring the controller in the HdeF level (AE4/AE5);
the range and the other parameters are set in the CAE4/CAE5 menu. The sensor--specific char-
acteristics (linearization) for thermocouples and Pt100 resistance thermometers are stored in
the contoller's program memory and are automatically taken into account. No settings need to
be made on the module itself.
The signal lines are connected via a plug terminal block with screw terminals. When using ther-
mocouples with internal reference point, this terminal block must be replaced by the terminal
6DR2805-8A. With the measuring range plug 6DR2805--8J in place of the terminal block, the
range of the direct input (0/20...100 mV) can be extended to 0/2...10 V or 0/4...20 mA.
The UNI module operates with an AD converter with 18 bit resolution. The measuring inputs
and ground of the standard controller are electrically isolated with a permissible common mode
voltage of 50 V UC.
6DR2805-8A Reference point
D Terminal with internal reference point for thermocouples
This terminal is used in connection with the UNI module for temperature measuring with ther-
mocouples at an internal reference point. It consists of a temperature sensor which is pre--as-
sembled on a terminal block and plated to avoid mechanical damage.
6DR2805-8J Measuring range plug
D Measuring range plug for current 0/4 to 20 mA or voltage 0/2 to 10 V
The measuring range plug is used in connection with the UNI module to measure current or
voltage. The input variable is reduced to 0/20 to 100 mV by a voltage divider or shunt resistors
in the measuring range plug.
Loop resistances with 250 Ω or 50 Ω are available optionally at 2 different terminals for 0/4 to
20 mA signals.
The electrical isolation of the UNI module is retained even when the measuring range plug is
used.
6DR2801-8D 2 BA relays
D Digital output module with 2 relay contacts
To convert 2 digital outputs to relay contacts up to 35 V UC.
This module is equipped with 2 relays whose switching contacts have potential free outputs.
The RC combinations of the spark quenching elements are respectively parallel to the rest and
working contacts.
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Manual
SIPART DR24 6DR2410
C79000-G7476-C153-03