RELATION BETWEEN STRUCTURES OF AN INTERLOCKING SYSTEM AND TEST DIAGNOSTICS REQUIREMENTS

Abstract

In the development phase of an interlocking system realised as a two-channel system with SW comparison and feedback, there is necessity to define maximum fault detection-plus-negation times on the base of known reliability parameters and to support them by an appropriate way of test diagnostics. Using example of the analysis of a two-channel system with two switching points and feedback and a two-channel system with three switching points and feedback, in the paper there is discussed an influence of a choice of the interlocking system structure on maximum fault detection-plus-negation times. For better understanding, in the paper there are given values of maximum detection-plus-negation times for faults of considered system elements that are calculated using the values of fictitious element failure rates.