Broach the standard NF EN ISO 13849-1 via the design of a basic safety function

This document is intended to guide designers to perform machinery control systems with only one or a few "basic" safety functions such as emergency stop or movable guard.
Among the available standards for machine design, NF EN ISO 13849-1 is the one providing recommendations to design safety related parts of control systems (SRP / CS) implementing different types of energy such as electric, hydraulic or pneumatic.
This document is based on the implementation of the simplified method of NF EN ISO 13849-1 and helps to understand the new concepts introduced by this standard.
The first part of the document entitled: Design guide for a SRP/CS, sheds light on some parts of the standard and also provides tools (graphs, tables ...) to facilitate the understanding and use but also choices that designers will have to do.
The second part consists of a practical case of a safety function designed by INRS using the standard and the tools shown in the guide. All phases of design are discussed, highlighting details and comments deemed necessary to assimilate the principles advocated by the standard.
Although new, the standard NF EN ISO 13849-1 does not bring major changes in the design of control systems related to safety. It retains much of the design principles recommended in the standard NF EN 954-1 that it replaces. The main new of this framework lies in the quantification of a number of parameters.