With reference to SCADA (Supervisory Control and Data Acquisition) systems:1.SCADA provides a Graphical User Interface (GUI) for monitoring industrial processes.2.It is used for real-time data logging and historical trending.3.SCADA directly performs high-speed local logic control, replacing the PLC.Which of the statements given above is/are correct?
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SCADA supervises distributed/industrial processes by acquiring data, presenting graphics, alarming, logging and trending. Fast deterministic local interlocking/control is normally executed in PLCs/RTUs, while SCADA coordinates and supervises at a higher level. Key relation: Typical hierarchy: sensors/actuators → PLC/RTU → SCADA/HMI.
Exam focus: SCADA supervises; PLC performs fast local logic. Common trap: Do not replace PLC safety/interlock logic with a SCADA screen.
Correct Answer: A - 1 and 2 only Quick Concept Explanation SCADA supervises distributed/industrial processes by acquiring data, presenting graphics, alarming, logging and trending. Fast deterministic local interlocking/control is normally executed in PLCs/RTUs, while SCADA coordinates and supervises at a higher level. Key relation: Typical hierarchy: sensors/actuators → PLC/RTU → SCADA/HMI.Exam focus: SCADA supervises; PLC performs fast local logic. Common trap: Do not replace PLC safety/interlock logic with a SCADA screen. Statement-wise Verification Statement 1 - Correct.SCADA provides a Graphical User Interface (GUI) for monitoring industrial processes.SCADA supervises distributed/industrial processes by acquiring data, presenting graphics, alarming, logging and trending. Statement…
Correct Answer: A - 1 and 2 only
Quick Concept Explanation
SCADA supervises distributed/industrial processes by acquiring data, presenting graphics, alarming, logging and trending. Fast deterministic local interlocking/control is normally executed in PLCs/RTUs, while SCADA coordinates and supervises at a higher level. Key relation: Typical hierarchy: sensors/actuators → PLC/RTU → SCADA/HMI.
Exam focus: SCADA supervises; PLC performs fast local logic. Common trap: Do not replace PLC safety/interlock logic with a SCADA screen.
Statement-wise Verification
Statement 1 - Correct. SCADA provides a Graphical User Interface (GUI) for monitoring industrial processes. SCADA supervises distributed/industrial processes by acquiring data, presenting graphics, alarming, logging and trending.
Statement 2 - Correct. It is used for real-time data logging and historical trending. SCADA supervises distributed/industrial processes by acquiring data, presenting graphics, alarming, logging and trending.
Statement 3 - Incorrect. SCADA directly performs high-speed local logic control, replacing the PLC. Fast local sequencing/interlocking is normally performed by PLCs/RTUs; SCADA supervises and logs
Core Concept
SCADA supervises distributed/industrial processes by acquiring data, presenting graphics, alarming, logging and trending. Fast deterministic local interlocking/control is normally executed in PLCs/RTUs, while SCADA coordinates and supervises at a higher level.
Option B is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2. Option D is incorrect because it includes incorrect statement(s) 3.
Exam Shortcut / Approach
SCADA supervises; PLC performs fast local logic.
Common Mistake
Do not replace PLC safety/interlock logic with a SCADA screen.
Quick Revision
Monitoring Logging Trending and PLC Role is linked with SCADA Functions, SCADA and Industrial Automation. SCADA supervises; PLC performs fast local logic.
Quick Trick
SCADA supervises; PLC performs fast local logic.
Why Other Options Are Wrong
Option B is incorrect because it includes incorrect statement(s) 3 and omits correct statement(s) 1. Option C is incorrect because it omits correct statement(s) 2. Option D is incorrect because it includes incorrect statement(s) 3.
Common Mistake
Do not replace PLC safety/interlock logic with a SCADA screen.
Exam Tip
SCADA supervises; PLC performs fast local logic.
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