SCADA system is a centralized system
which monitor and controls entire sites of a plant spread out over large areas.
SCADA Supervisory Control and Data Acquisition system is basically software
which is used to centrally monitor and control the process parameters of
various sections of a plant in real time. The software contains a library,
SCADA developer develops virtual image of various field devices, motors, hopers,
solenoid valves, control valves, alarms, MEP section and attaches these
graphics to the real world devices. Any changes in process parameters, position
of devices is available to the operator on real time basis. Thus it’s a
simulation through which all activities of the plant can be monitored and
controlled. SCADA system is generally complex in configure but it is at the
same time very easy to operate. Most controls are automatically performed
either by Remote Terminal
Units
("RTUs") or by PLC (Programmable Logic Controllers). For performing control action SCADA
System needs PLC System, thus PLC SCADA systems are typically used together.
SCADA
software is installed in a PC and is connected to various PLCs and other
peripheral field devices. It generates applications for the demanding
requirements of plant engineers, operators, supervisors and managers. These
requirements are customized as per the needs of each plant. SCADA continuously received
data from the plant in real-time, stores and processes it in the database,
evaluates and generates displays parameters in digital or graphical form,
generates alarms and events. It can also issue instructions to PLCs and
generate reports from this data for use of plant operators, engineers, managers.
SCADA system and its Sub-systems
- A Human-Machine Interface or HMI is
the device which is used with standalone machines
- Remote Terminal Units (RTUs) which
connect various sensors to the process system, condition the signal
generated from sensors to usable signal and send this date to SCADA System.
- Programmable Logic Controller (PLCs) are
the devices which actually control the process system.
- Industrial
networks connecting SCADA the Remote Terminal Units.
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SCADA and its uses in a
plant
· Production
department gets real time production parameter, manufacturing status is updated
in real time basis and communicated to operator and control device
· Production
schedules can be viewed and updated automatically
· Production
specific information is managed and distributed when it matters the most
· Data integrity
and quality control is improved by using a common interface
· Great platform
for quality and statistical analysis
·
SCADA
System helps in consolidation of manufacturing & lab data
· SCADA software
helps in troubleshooting and troubleshooting. SCADA system is directly
connected to wide variety of field devices, so the defect rectification time is
greatly reduced.
· SCADA Systems
facilitates plants to be viewed /monitored remotely. Alarms/Notifications can
be automatically generated and e-mailed, messaged to the concerned.
· Reduced downtime.
Co-ordination among various departments is greatly enhanced.
· SCADA Software with
its real time functionality makes process operations easier.
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