Supervision versus control
There is, in several industries, considerable confusion over the differences between SCADA systems and distributed control systems (DCS). Generally speaking, a SCADA system always refers to a system that coordinates, but does not control processes in real time. The discussion on real-time control is muddied somewhat by newer telecommunications technology, enabling reliable, low latency, high speed communications over wide areas. Most differences between SCADA and DCS are culturally determined and can usually be ignored. As communication infrastructures with higher capacity become available, the difference between SCADA and DCS will fade.
Summary
DCS is process oriented, while SCADA is data acquisition oriented.
DCS is process driven, while SCADA is event driven.
DCS is commonly used to handle operations on a single locale, while SCADA is preferred for applications that are spread over a wide geographic location.
There is, in several industries, considerable confusion over the differences between SCADA systems and distributed control systems (DCS). Generally speaking, a SCADA system always refers to a system that coordinates, but does not control processes in real time. The discussion on real-time control is muddied somewhat by newer telecommunications technology, enabling reliable, low latency, high speed communications over wide areas. Most differences between SCADA and DCS are culturally determined and can usually be ignored. As communication infrastructures with higher capacity become available, the difference between SCADA and DCS will fade.
Summary
DCS is process oriented, while SCADA is data acquisition oriented.
DCS is process driven, while SCADA is event driven.
DCS is commonly used to handle operations on a single locale, while SCADA is preferred for applications that are spread over a wide geographic location.
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