SUPERVISORY CONTROL AND DATA ACQUISITION (SCADA)
A SCADA system is a collection of both software and hardware components that allow supervision and control of plant,both locally and remotely.
The SCADA also examine,collects,and processes data in real time. Human machine interface or HMI software facilitate interaction with field devices such as pumps, valves, motors, sensors etc. Also with in the SCADA software is the ability to log data for historical purposes.
The structural design of a standard SCADA system starts with remote terminal units or RTU'S and or programmable logic controller or PLC.
As you know, RTU'S and PLC'S are microprocessors that communicate and interact with field devices such a valves, pumps and HMI'S that communication data is routed from the processors to the SCADA computers, where the software interprets and displays the data allowing for operators to analyze and react to system events.
Before SCADA plant personnel had to monitor and control industrial processes via selector switches, push buttons, and dials for analog signal this meant that plants had to maintain personnel or site, during production,in order to control the process. As manufacturing grow and site become more remote in nature,relays and timer were used to assist in the supervision and control of processes.
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