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What is SCADA?

SCADA is an acronym for Supervisory Control and Data Acquisition, a type of industrial control that is used in process applications. In a typical SCADA system, independent programmable logic controllers (PLCs) perform IO control functions on field devices while being supervised by a Human Machine Interface (HMI) software package, typically running on a personal computer (PC). Process control technicians monitor PLC operation on the PC and send control commands to the PLCs if required. The HMI SCADA software may also trend and archive process data on the PC for later inspection.