This standard provides guidance in understanding and implementing safety-related control functions (functional safety) and specifications as they relate to electrical, electronic, mechanical, pneumatic, hydraulic components and systems for machines covered by the B11 series of safety standards.

Informative Note 1:  This document includes a large number of detailed schematic circuit diagrams that are provided as EXAMPLE circuits only, representing common solutions in use at the time of creating this document.  It is important to understand that there are many ways to fulfil a given engineering requirement and the examples only present one option.  These examples are not normative, nor intended to limit innovation or the advancement of technology.

Informative Note 2:  This document references ISO 13849-2 – Validation as part of an annex.

Informative Note 3:  This document is not intended to address the programming or software of programmable electronic systems/programmable electronic devices (PES/PED).  See ANSI B11.TR4.

Informative Note 4:  See also, clause 4 on “How to use this standard.”