Data quality flags in SCADA systems - Cheat Sheet & Quick Revision

Recall & Review

beginner

What are data quality flags in SCADA systems?

Data quality flags are markers used to indicate the reliability or status of data collected by SCADA systems. They help identify if data is good, suspect, or invalid.

beginner

Why are data quality flags important in monitoring industrial processes?

They ensure decisions are made using trustworthy data by highlighting errors, missing values, or sensor faults, preventing wrong actions based on bad data.

intermediate

Name three common types of data quality flags used in SCADA systems.

Common flags include: Good (valid data), Suspect (possible error), and Bad (invalid or missing data).

intermediate

How can data quality flags affect automated control decisions?

Automated systems can ignore or alert operators when data is flagged as suspect or bad, preventing incorrect control actions that could harm equipment or processes.

advanced

What steps can be taken when data is flagged as 'suspect' in a SCADA system?

Operators can verify sensor health, check communication lines, compare with other data sources, and decide to trust, correct, or discard the data.

What does a 'Good' data quality flag indicate in SCADA data?

A Data is valid and reliable

B Data is missing

C Data is corrupted

D Data is outdated

A 'Good' flag means the data is valid and can be trusted for analysis or control.

Which data quality flag suggests that data might have errors but is not confirmed bad?

A Bad

B Good

C Suspect

D Unknown

The 'Suspect' flag warns that data may be incorrect and needs checking.

What should a SCADA system do when it receives data flagged as 'Bad'?

A Use the data for control decisions

B Store data without flags

C Automatically correct the data

D Ignore or alert operators

Data flagged as 'Bad' should be ignored or trigger alerts to avoid wrong actions.

Data quality flags help in which of the following?

A Increasing data size

B Improving data trustworthiness

C Speeding up data transmission

D Encrypting data

Flags improve trust by showing which data is reliable or needs attention.

If sensor data is flagged as 'Suspect', what is a good first step?

A Check sensor and communication status

B Delete all data

C Ignore the flag and use data

D Restart the SCADA system

Checking sensor and communication helps find the cause of suspect data.

Explain what data quality flags are and why they matter in SCADA systems.

Think about how flags help identify good or bad data.

Describe how a SCADA operator should respond when data is flagged as suspect or bad.

Consider troubleshooting steps and safety.