Scada means Supervisory Control and Data Acquisition. Programs coded in Scada are used for controlling various industrial processes and complex equipments. There are various scada systems in use today. These are called MMI or man machine interfaces.
SCADA programs are run on computers and are used to control various devices from there. Many techniques are used to link to the devices that have to be controlled. These include Ethernet, modems and radio links. Sensors are used to access data about various devices in a plant or industrial location.
Due to the usage of diverse systems, many converters are employed for signal conversion for compatibility between various communication links. A central unit can control and monitor all the information received by various communication links.
A database is maintained in the master control unit. All the equipments in the plant or infrastructure location have various parameters that are monitored and real time information about them is stored in the database. Thus any instrument can be controlled by the master unit.
There can be analogue or digital parameters. These parameters are regularly accessed by SCADA and stored in this database. Then the program can compute the results based on those values stored in its database.
The calculations made by SACA program can then help in supervisory control and data acquisition. Modern Scada software shows you a graphical representation of various objects on the computer screen.
Various details are fetched from equipments used all over the industrial unit. Some important parameters are pressure, liquid level, temperature, etc. These details can be seen on the computer screen graphically too.
The scada pc software can also have additional modules that will automatically SMS or email a person during any problem or a pre-programmed situation. Thus these can help control a plant and access information about it remotely.
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