What is SCADA?
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The SCADA acronym stands for Supervisory Control and Data Acquisition.
A SCADA system is a collection of both software and hardware components that allow supervision and control of plants, both locally and remotely.
The structural design of a standard SCADA system starts with Remote Terminal Units (RTUs) and/or Programmable Logic Controllers (PLCs).
As you know, RTUs and PLCs are microprocessors that communicate and interact with field devices such as 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 signals.
This meant that plants had to maintain personnel on site, during production, in order to control the processes.
As manufacturing grew and sites became more remote in nature, relays and timers were used to assist in the supervision and control of processes.
With these devices employed, fewer plant personnel were required to be on site in order to oversee and control operations.
While relays and timers did provide some level of automation, the panels required for these devices took up valuable real estate, troubleshooting was a nightmare, and reconfiguring was difficult at best.
These issues, in conjunction with the need to grow even larger industrial plants, helped to facilitate the birth of automation.
Controlling industrial plants via processors became a reality in the 1950s. Gas and oil, utilities, and manufacturing were major users of these new technologies and supervisory control.
Another decade later the term SCADA was used to describe systems with PLC’s and microprocessors that were being used for the monitoring and control of automated processes on an even greater scale than ever before. SCADA, back then, was anything but practical.
In the next couple of decades, the ’80s and 90s, with computer systems getting smaller, the advent of Local Area Networking (LAN), and HMI software, SCADA systems were able to connect to related systems.
Later in the ’90s and 2000s, SCADA began to implement open system architectures with communication protocols that were not vendor specific.
As you can imagine, this opened up SCADA’s ability to connect with varying vendors. This newer, more improved SCADA was then called a networked SCADA system.
Current day SCADA systems have adapted to the changing technologies and have a great advantage over the older SCADA systems.
With the adoption of modern IT standards such as SQL and webbased applications, today’s SCADA allows for realtime plant information to be accessed from anywhere around the world.
Having this data at the operator’s fingertips facilitates improved plant operations allowing for responses to SCADA system queues based on field collected data and system analysis.
Essentially, SCADA is a collection of hardware and software components.
This collection of components begins with realtime data collected from plant floor devices such as pumps, valves, and transmitters.
These components don’t have to be from a particular vendor, they just need to have a communication protocol that the processor can utilize.
Data collected from the field devices is then passed to the processors such as PLCs. From the processor, the data is distributed to a system of networked devices. These devices may be HMIs, enduser computers, and servers.
On the HMI and enduser computer, graphical representations of the operations exist for operator interactions such as running pumps and opening valves.
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