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Supervisory control and data acquisition (SCADA) is a system for remote monitoring and control that operates with coded signals over communication channels (using typically one communication channel per remote station).
On the other hand, SCADA - supervisory control and data acquisition - is mainly a software environment that can communicate with PLC's and probably DCSs also for that matter in order to monitor the functionality of those devices and perform data acquisition and data logging to a monitoring platform - say a computer in a control room etc.