SOPD SCADA Systems 2

Question 1

What is the primary function of a Remote Terminal Unit (RTU) in a SCADA system?

Accepted Answer

Collect field data and transmit it to the master station

Answer

RTUs collect analog and digital data from field devices and transmit it to the SCADA master station for monitoring and control.

Question 2

In SCADA communications, what does the term 'polling' refer to?

Accepted Answer

A method where the master station periodically queries each RTU for data

Answer

Polling is a master-initiated communication method where the control center sequentially queries each RTU to retrieve current status and measurements.

Question 3

Which SCADA display element is used to show the real-time state of a circuit breaker as open or closed?

Accepted Answer

Status point (digital point)

Answer

Status points (digital points) represent two-state or multi-state equipment conditions such as breaker open/closed positions on SCADA displays.

Question 4

What distinguishes a Supervisory Control and Data Acquisition (SCADA) system from a Distributed Control System (DCS)?

Accepted Answer

SCADA is designed for geographically dispersed sites while DCS manages localized continuous processes

Answer

SCADA systems are optimized for monitoring and controlling assets spread over large geographic areas, whereas DCS systems focus on continuous process control within a single facility.

Question 5

When a SCADA system shows a 'stale' data indication, what does this mean for the operator?

Accepted Answer

The data has not been updated within the expected scan interval

Answer

Stale data indicates that the SCADA master has not received a fresh update from the RTU within the configured scan cycle, suggesting a communication or RTU issue.

(SOPD) System Operator/Power Dispatching Practice Test

(SOPD) System Operator/Power Dispatching Practice Test

SOPD SCADA Systems 2