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Inherited controls are those existing controls that user would inherit to add custom functionalities. E.g. TextBox, DataGrid; Usually these are used for common validations, GUI features etc. User Controls are controls that user creates using either one or more controls, add some common application logic.
The term SCADA (Supervisory Control and Data Acquisition) usually refers to centralized systems which monitor and control entire sites, or complexes of systems spread out over large areas (anything from an industrial plant to a nation). Most control actions are performed automatically by RTUs or by PLCs.ata acquisition begins at the RTU or PLC level and includes meter readings and equipment status reports that are communicated to SCADA as required. Data is then compiled and formatted in such a way that a control room operator using the HMI can make supervisory decisions to adjust or override normal RTU (PLC) controls.