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A PLC is a piece of physical hardware. SCADA, on the other hand, is software. To this end, a PLC is physical. You can hold a PLC and examine it. As software, SCADA operates on a computer system and can be compared to an operating system like Windows.
BMS systems have stand-alone controllers that are specifically designed to collect data from these devices. PLC systems require remote input and output (I/O) devices, which are not stand-alone, to provide control for these specialized applications.
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