Safety Certified Controllers with PL c and PL d Performance Levels-A Survey

Abstract

The safety standards have role to stimulate designers to pay attention more on the functions that are necessary to reduce each individual risk, instead of focusing on particular components. Applying these standards, the performance of each function is in the designer's focus as well. These standards allow higher level of safety during the machine's life. This paper enumerates all fields that have importance for safety legislation and standards, and on the other hand, it tries to answer the question: What is the impact of using the different safety standards on the tester work?