CHECKABILITY OF SAFETY-CRITICAL I&C SYSTEM COMPONENTS IN NORMAL AND EMERGENCY MODES

In this paper the peculiarities of the safety-critical (in particular, protection) systems and their digital components as objects of on-line testing are discussed. A problem of limited opportunities of the on-line testing of a digital component while its operation in the normal and emergency modes on the limited sets of input words is defined. This problem is associated with low checkability of the digital components in safety-critical I&CS. A method of digital components estimation in checkability is offered.