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Title: Basic Scada Systems EM-3070
Author: Rick Kroeker
Source: 2001 International School of Hydrocarbon Measurement
Year Published: 2001
Abstract: A SCADA (Supervisory Control and Data Acquisition) system is typical made up of many distributed remote microprocessors that are communicated to (supervised) by a central computer system most commonly referred to as a host. Supervisory control implies that the remote unit performs the local control function with the host performing the supervisory control function such as writing the setpoint to the controller. Not only does the host system send supervisory commands to the remote units but also it usually collects data (data acquisition) from the units. This data can be used for many purposes including feedback to the system operator, trending, alarming and accounting.

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