Introduction to SUPERVISORY CONTROL AND DATA ACQUISITION SYSTEM (SCADA)
SCADA refers to a system that collects data from various sensors at a plant or in other
remote locations and then sends this data to a central computer which then manages and
controls the data. There are two elements in SCADA application such as the process or
system want to monitor and control and a network of intelligent devices that interfaces
with the first system through sensors and control outputs.
There are four components of SCADA
1. Sensors, control relays that directly interface with the managed system
2. RTUs or PLCs. These are small computerized units deployed in the field at
specific sites and locations. They serve as local collection points for gathering
reports from sensors and delivering commands to control relays.
3. SCADA Master Units. These units provide human interface to the system and
automatically regulate the managed system in response to sensor inputs. Also
provides central processing of some SCADA systems.
4. The Communication network that connects the SCADA master units to the RTUs
in the field.