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SCADA
- 1. SCADA
- 2. SCADA defined • Supervisory Control And Data Acquisition. • It is used to create the visualizations/animations of any running process. What is SCADA? • PLC is like a black box. Earlier they were programmed and run for years. No one knew what was happening inside the PLC. • The solution was PLC + SCADA. Why SCADA?
- 3. Softwares and hardware Wonderware Intouch for SCADA RSLinx Classic for communications RSLogix 500 for PLC programming Programmable Logic Controllers (PLCs) - Standardized on Allen-Bradley SLC and Micrologix controllers.
- 4. The two faces of SCADA Traditional SCADA for pipelines, power distribution or anything that spans great distances. Local control SCADA for plant or unit operations or any architecture that is within a defined boundary.
- 5. Features of SCADA Dynamic process graphics Alarm Real time and historical trends Security Recipe management Device connectivity
- 6. Dynamic process graphics Once the operator sees the screen he should know what is going on in the plant.
- 7. Alarm Alarms indicate to the operator when something goes wrong. It signals that a device or process has stopped operating within acceptable, pre-defined limits or it can indicate breakdown. Generally you have alarm states for each input/output like your temperature shouldn’t cross 80 degrees.
- 8. Real time and historical trends If the plant trips you can simply go to the historical trend data and do the analysis. For e.g., If an acid regeneration plant is operated at 900 degrees, instead of the usual 850 degrees, it means additional LPG is being put into the reactor. The production manager can go through the trends to find the problem.
- 9. Security Allocation of certain facilities or features to different people. For e.g., operators should only operate the system, he shouldn’t be able to change the application. The engineers should have access to changing the application developed.
- 10. Recipe management Most of the plants manufacture multiple products. When you have different products to manufacture, you just have to load the recipe of that particular product.
- 11. Device connectivity There are hundreds of automation hardware manufacturers like Modicon, Siemens, Allen Bradley etc. Every software has its own way of communication or communication protocol with its respective hardware. This shouldn’t happen. The software like Wonderware has connectivity to almost all hardware used in automation.
- 12. About graphic objects The components that make up a graphic display. You can attach animation for example apply both width and height animation to an object to give it the appearance of moving into or out of the display as it shrinks or grows respectively.