scope:

This European standard is applicable to safety-related electronic systems (including subsystems and equipment) for railway signalling applications. This European standard applies to generic systems (i.e. generic products or systems defining a class of applications), as well as to systems for specific applications. The scope of this European standard, and its relationship with other CENELEC standards, are shown in Figure 1. This European standard is applicable only to the functional safety of systems. It is not intended to deal with other aspects of safety such as the occupational health and safety of personnel. While functional safety of systems clearly can have an impact on the safety of personnel, there are other aspects of system design which can also affect occupational health and safety and which are not covered by this European standard. This European standard applies to all the phases of the life-cycle of a safety-related electronic system, focusing in particular on phases from 5 (architecture and apportionment of system requirements) to 10 (system acceptance) as defined in EN 50126 (all parts).