Computer Systems & Software Updates Flashcards

Which type of software update specifically addresses known security vulnerabilities without adding new features?

Answer: Security patch

Security patches are targeted fixes released to close known vulnerabilities without changing functionality.

In a process plant DCS, what is the recommended practice before applying a software update to a live controller?

Answer: Test the update on an offline or redundant system first

Testing on an offline or redundant system first ensures the update does not disrupt live process control.

What does the term 'rollback' mean in the context of software updates for process control systems?

Answer: Reverting to a previously stable software version after a failed update

Rollback is the process of restoring the previous software version when a new update causes problems.

Which communication protocol is commonly used by SCADA systems to poll field devices for data?

Answer: Modbus

Modbus is a widely used serial/Ethernet protocol for SCADA systems to communicate with PLCs and field instruments.

What is the purpose of a 'change freeze' period in process plant IT management?

Answer: To prohibit non-emergency software changes during critical production periods

A change freeze prevents software modifications during high-risk periods such as peak production or regulatory audits.

When a process technician notices that the HMI trend displays have stopped updating, which system component should be checked first?

Answer: The historian server or data collection service

Trend data is served by the historian; if it stops updating, the historian service or its connection to the DCS is the first suspect.

What does 'versioning' refer to in process control software management?

Answer: Tracking and labeling successive releases of software with unique identifiers

Versioning assigns unique identifiers to each software release so operators can track, compare, and revert to specific states.