Safety Considerations Guide, Tricon v9.0 - Tuv-fs.com

Safety Standards 15Safety StandardsOver the past several years, there has been rapid movement in many countries todevelop standards and regulations to minimize the impact of industrial accidentson citizens. The standards described below apply to typical applications.General Safety StandardsDIN V 19250In Germany, the methodology of defining the risk to individuals is established inDIN V 19250, “Control Technology; Fundamental Safety Aspects To BeConsidered for Measurement and Control Equipment.” DIN V 19250 establishesthe concept that safety systems should be designed to meet designated classes,Class 1 (AK1) through Class 8 (AK8). The choice of the class is dependent on thelevel of risk posed by the process. DIN V 19250 attempts to force users to considerthe hazards involved in their processes and to determine the integrity of therequired safety-related system.DIN V VDE 0801As the use of programmable electronic systems in safety system designs hasbecome prevalent, it is necessary to determine whether the design of a PES issufficiently rigorous for the application and for the DIN V 19250 class. DIN VVDE 0801, “Principles for Computers in Safety-Related Systems,” sets forth thefollowing specific measures to be used in evaluating a PES:• Design• Coding (system level)• Implementation and integration• ValidationEach measure is divided into specific techniques that can be thoroughly tested anddocumented by independent persons. Thus, DIN V VDE 0801 provides a means ofdetermining if a PES meets certain DIN V 19250 classes.Chapter 1Safety Concepts