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In manufacturing, an operational historian is a time-series database application that is developed for operational process data.[1] Historian software is often embedded or used in conjunction with standard DCS and PLC control systems to provide enhanced data capture, validation, compression, and aggregation capabilities.[2] Historians have been deployed in almost every industry and contribute to functions such as supervisory control, performance monitoring, quality assurance, and, more recently, machine learning applications which can learn from vast quantities of historical data.
These systems were originally developed to capture instrumentation and control data, which led many to use the term "tag" for a stream of process data, referring to the physical "tags" which had been placed on instrumentation for manually capturing data. Raw data may be accessed via OPC HDA, SQL, or REST API interfaces.[3]
^R. H. (Rick) Meeker Jr. (13 January 1999). "A Practical Guide to Process Data Historians and Process Information Systems". TAPPI. Archived from the original (PDF) on 2013-02-16. Retrieved 2024-01-31.
^"Globalspec Historian Article". Retrieved 12 Jul 2012.
^"Operational Historian vs Enterprise Historian". Retrieved 5 June 2018.
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