What is the primary purpose of redundancy in safety-critical robot systems?

• A. Duplicate critical components or paths to maintain safety if one fails.
• B. Reduce production costs by sharing parts.
• C. Increase robot speed by parallelizing control loops.
• D. Eliminate all safety features to streamline maintenance.

Answer: (A)

Redundancy in safety-critical robot systems means duplicating essential components or signal paths so that if one part fails, another can take over and keep the system safe. This fault-tolerant design prevents a single failure from leading to an unsafe state, allowing continued safe monitoring, control, and protective actions (like safe shutdown or emergency stops). By having backup sensors, actuators, controllers, or communication channels, the system maintains critical safety functions even in the presence of faults.

This isn’t about cutting costs, speeding up control loops, or removing safety features. Duplication increases reliability and preserves safety under failure conditions, which is why it’s the primary purpose of redundancy.