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Self-test and fault isolation is a process of self-checking a system against threats and vulnerabilities. Most modern-day systems have a processor-check ability that allows a computer to test itself and the rest of the system for any fault. An emergency message is generated to the system log if any faulty hardware or software is found.
Self-test and fault isolation saves diagnostic time in large systems where the detection of fault takes real effort. This saves the system from sudden breakdowns, and detects issues before a real problem is created. This feature is typically used in electricity transmission systems where wires and cables are used over long distances of transmission lines. Smart controllers are used on poles and grid lines where they can detect a fault many kilometers away and shut down or isolate the machinery to prevent damage.