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

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

11-30-2015

Publisher

British Standards Institution

This Technical Report 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 Figures1 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. This Technical Report does not replace the use of any standards for the safety of machinery. The goals of this Technical Report are the following: guidance for users for estimation of the maximum DC values; design guidance for SRP/CS. NOTE1 Interlocking devices with integrated self-monitoring are not included in the scope of this Technical Report. NOTE2 Limitation is also given by the diagnostic means implemented in the logic unit. NOTE3 This Technical Report is not restricted to mechanical actuated position sensors.

Committee	MCE/3
DocumentType	Standard
Pages	0
PublisherName	British Standards Institution
Status	Current

Standards	Relationship
ISO/TR 24119:2015	Identical

ISO 14119:2013	Safety of machinery Interlocking devices associated with guards Principles for design and selection
ISO 10218-2:2011	Robots and robotic devices Safety requirements for industrial robots Part 2: Robot systems and integration
IEC 60204-1:2016	Safety of machinery - Electrical equipment of machines - Part 1: General requirements
ISO 12100:2010	Safety of machinery — General principles for design — Risk assessment and risk reduction
ISO 13849-2:2012	Safety of machinery — Safety-related parts of control systems — Part 2: Validation
ISO 13849-1:2015	Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design