Programmable Logic Controller or PLC is a computing system used to control electro-mechanical processes.

SCADA stands for Supervisory Control and Data Acquisition. It is a type of industrial control system that is used to monitor and control facilities and infrastructure in industries.

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  • A Programmable Logic Controller also known as PLC, is a piece of hardware used to read sensors.
  • PLCs receive information from connected sensors or input devices, process the data, and triggers outputs based on pre-programmed parameters
  • They were initially developed in the automobile manufacturing industry to provide heavy duty, programmable controllers to replace hard-wired relays, timers and sequencers.
  • They are now used as automation controllers suitable for harsh environments in many different industry processes.
  • PLCs are also used to function asreal-time systems, since output results must be produced in response to input conditions within a limited time, for continuous proper operations.


  • Supervisory Control and Data Acquisition(SCADA) is monitoring software used to control the PLC and record data, even from remote locations.
  • SCADA systems use computers, networked data communications and graphical user interfaces for high-level process supervisory management by relying on PLC’s and discrete PID controllers to interface with the process plant or machinery.
  • SCADA systems are managed by an operator using an operator interface which allows the individual to monitor and the issue process commands through the SCADA COMPUTER SYSTEM.

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