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4.3 Data Acquisition Modules
26 Digital Fault Recorder, SIMEAS R-PMU, Manual
E50417-H1076-C360-A5, Release 10.2012
4.3 Data Acquisition Modules
4.3.1 Types and Design of Data Acquisition Modules
Different acquisition modules are provided for different measuring purposes.
VCDAU: Recording of alternating voltage and current, binary signals
VDAU: Recording of alternating voltage, binary signals
CDAU: Recording of alternating current, binary signals
DDAU: Recording of process signals (direct current / direct voltage)
BDAU: Recording of binary signals
The signals are connected to the corresponding DAU using the rear terminals.
The DAU modules include the required modules for signal matchings: these are current and volt-
age transformers for the alternating signals, isolation amplifiers for the direct signals and opto-
couplers for binary signals.
In addition, the DAU includes the A/D conversion and the complete further digital processing.
A Digital Signal Processor (DSP) is responsible for this type of processing.
Communication between the DAUs and with the CPU module is implemented via an internal bus
that is used for synchronization, parameterization and data exchange.
Figure 4-3 Principle design of data acquisition unit; BDAU doesn't contain any A/D converter
Note
The measuring inputs of the VCDAU, VDAU and VDAU are arranged in two groups of four ana-
log inputs each.
Note
For the data acquisition modules VCDAU, VDAU and CDAU, in this manual sometimes the name
AC DAU is used.
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