SCADA Systems



The definition of SCADA is ‘Supervisory ontrol and Data Acquisition’. The major fungcion of SCADA is for acquiring data from remote devices such as valves, pumps, transmitters etc. and providing overall control remotely from a SCADA Host software platform. This provides process control locally so that these devices turn on and off at the right time, supporting your control strategy and a remote method of capturing data and events (alarms) for monitoring these processes. SCADA Host platform also provide functions for graphical displays, alarming, trending and historical storage of data.
Historically, SCADA products have been produced that are generic with a ‘one shoe fits all’ approach to various markets. As SCADA has matured to provide specific solutions to specific SCADA markets it has provided solutions for ide area network SCADA systems that rely on tenuous communication links. These types of SCAFA systems are used extensively thoughout the Oil & Gas market due to the fact that assets are spread over large geographical areas.

Looking at the overall structure of a SCADA system, there are four distinct levels within SCADA, thise being:

- Field instrumentation
- PLCs and / or RTUs
- Communications networks and
- SCADA host software

We will discuss each of these levels in detail, describing their function, how SCADA has changed over the past 30 years and the impact of security requirements and regulatory compliance on SCADA system operations.


Source: Retyped From SCADA Systems White paper (Mrch 2012) by Schneider Electric Tekementry & Remote SCADA Solutions

Conclusion of SCADA 
About Slave-to- Slave Messaging SCADA
Programmable Logic Controllers (PLCs)
Terminology of PLCs
The L3GD203-Axis Gyro

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