DIN EN 50128:2012-03

This European Standard describes a set of requirements with which the development, deployment and maintenance of any safety-related software intended for railway control and protection applications shall comply. It defines requirements concerning organisational structure, the relationship between organisations and division of responsibility involved in the development, deployment and maintenance activities. Criteria for the qualification and expertise of personnel are also provided in this European Standard. The key concept of this European Standard is that of levels of software safety integrity. This European Standard addresses five software safety integrity levels where 0 is the lowest and 4 the highest one. The higher the risk resulting from software failure, the higher the software safety integrity level will be. The responsible committee is Subcommittee UK 351.3 "Bahn-Signalanlagen" ("Signalling systems for railways") of the DKE (German Commission for Electrical, Electronic and Information Technologies) at DIN and VDE.