SCADA Interview Questions:
Different Levels of SCADA?
Answer: Different levels are SCADA systems are:
- Field level devices and instruments eg: Sensors
- Remote Terminal Units (RTUs)
- Communication system present between the RTUs and Main Station
- Main Control Station or Master Station
- Computer systems pertained to processing the data for displaying to operator
Why SCADA systems are Implemented?
Answer: Some of the reasons or advantages why SCADA systems are implemented are:
- SCADA systems improves the performance of the operation of the plant
- SCADA systems provides better protection to the equipment of the plant
- SCADA systems improves productivity of the personnel
- Information receives very fast, process the information and display it to opertor in graphs and plots. Hence helps the operator to take the decisions fast.
- Provides better energy savings and saves economy.
What is the capacity of CPU of Remote Terminal Unit (RTU)?
Answer: Remote Terminal Units (RTUs) contain generally microprocessor having 16 bit or 32 bit (eg: 68302 or 80386)
What is the Power Supply provided to the RTU?
Answer: Remote Terminal Units (RTUs) are operated from 110V/240V + or - 10% and 50Hz or 12/24/48V + or - 10% DC Voltage
What are advantages of PLCs over RTUs?
Answer: Advantages of Programmable Logic Controllers (PLCs) are they can be used for general purpose can easily set for verity of functions. Some of the advantages of PLCs over RTUs are: PLCs are reliable, cheap, flexible compared to RTUs, sophisticated control and troubleshooting in PLC is easier.
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