The capability for continuous on-line self-testing should be provided when practicable to support prompt detection of faults.
Additional Information:
Continuous on-line self-testing allows tests to be performed with minimal involvement by personnel, and can reduce the amount of time between the occurrence and the detection of a fault. Tests may include, but should not be limited to, random access memory and read-only memory failure checks, arithmetic processing unit failure checks, data link buffer checks, and central processing unit reset of watchdog timers. For safety-related systems, testing features should be designed to reduce the complexity of safety-related software logic and data structures.