Closely related to the SCADA system is the distributed control system. The differences between a SCADA system and a DCS are very small and the two have become almost indistinguishable over time. Traditionally, though SCADA systems were used for automation tasks that cover a larger geographical area, meaning that parts of the SCADA system are located in separate buildings or facilities as where a DCS is more often confined to a single plant of facility. A DCS is often a large-scale, highly engineered system with a very specific task. It uses a centralized supervisory unit that can control thousands of I/O points. The system is built to last with redundancy applied to all levels of the installation, from redundant ...
Distributed control system
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