The CADA (Supervisory
Control and Data
Acquisition) system mainly
consists of human-machine
interfaces (HMI), server and
client computer systems,
remote terminal units (RTU),
DCS and PLCs, various
communication structures and
various instruments. The HMI
is the interface that
provides the operator with
process data and thus allows
the operator to monitor and
control the process. RTU is
the unit that connects the
sensors in the process,
converts the sensor signals
into digital signals and
sends these signals to the
upper system. PLC is a
configurable and more
flexible field device that
performs locally similar
jobs. SCADA, which forms a
visual control platform for
all kinds of inspection,
control and monitoring, is
located on one or more
networks together with the
above-mentioned subsystems.
With this structure, it
provides easy and quick
access to the process
information and helps to
take precautions against
possible failures. In a
power plant, all control
architecture including
turbine and boiler control,
cooling system control, coal
transport line, switchyard
and monitoring of MCC
panels, condenser control to
gas analysis are transferred
to SCADA via DCSs. SCADA
offers a wide range of
possibilities for monitoring
events and alarms, reviewing
back-up information and
reporting information
outside the control function
over GSM. The reporting
functions and the production
report drafts determined by
the electrical institutions
can be prepared in advance
and automatically created at
the desired intervals
(daily, weekly, monthly,
etc.). In addition, ler
predictive maintenance ada
can be performed by
monitoring the working times
and alarms of various
actuators such as breaker,
motor, pump, valve in the
field. In this way, the
possible errors can be
foreseen and the downtimes
can be shortened. With Thin
Client or Web Clients, the
system status can be
monitored from any remote
location outside the plant.
