ABB REG316 4 Series Operating Instructions Manual page 401

REG 316*4 1MRB520049-Uen / Rev. B
4. DESCRIPTION OF FUNCTION AND APPLICATION
4.1. Summary
Both analogue and binary input signals pass through a signal
conditioning stage before being processed by the CPU and logic
processor.
As described in
signals are conditioned by the chain comprising the input trans-
former, shunt, low-pass filter (anti-aliasing filter), amplifier, sam-
ple and hold stage, multiplexer and A/D converter. The resulting
digital signals are then separated by digital filters into real and
apparent components before arriving at the main processor.
Opto-couplers in the inputs of the binary signals act as a fire wall
to electrically separate internal and external circuits. The binary
signals are then logically processed by the main processor.
Only after the signals have been properly conditioned does
processing of the protection function algorithms commence.
An additional logic programmed using FUPLA (function block
programming language) provides convenient facility for achiev-
ing special circuits needed for specific applications.
The memory of the event recorder function has sufficient capac-
ity for up to 256 binary signals and their time tags.
The memory of the disturbance recorder registers 9 analogue
and 16 binary signals. The number of events it can actually re-
cord depends on the total duration of an event as determined by
the amount of pre-event data (event history) and the duration of
the event itself.
Where necessary, a large variety of supplementary protection
and logic functions is available in the RE. 216 and RE. 316*4
function software libraries.
Section 2. "Description of hardware", analogue
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