Difference Between PLC and SCADA?

PLC

• 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 as real-time systems, since output results must be produced in response to input conditions within a limited time, for continuous proper operations.

SCADA

• 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.