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ISO/TR 24119:2015

Safety of machinery — Evaluation of fault masking serial connection of interlocking devices associated with guards with potential free contacts

Nov 13, 2015

General information

60.60     Nov 13, 2015


ISO/TC 199

Technical Report


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ISO/TR 24119:2015 illustrates and explains principles of fault masking in applications where multiple interlocking devices with potential free contacts (B1 to Bn) are connected in series to one logic unit (K) which does the diagnostics (see Figures 1 to 7). It further provides a guide how to estimate the probability of fault masking and the maximum DC for the involved interlocking devices. This Technical Report only covers interlocking devices in which both channels are physical serial connections.

Life cycle


ISO/TR 24119:2015
60.60 Standard published
Nov 13, 2015