Based on a safety concept, safety experts from SICK create detailed specifications of the safety-related parts of controllers. The specifications form the basis for implementation of the planned safety solution and contain both the selection and connection of suitable safety components as well as the definition of required diagnostic measures. The quantitative calculation of the achieved performance level (PL) provides proof of the fulfilled normative requirements. Other required aspects such as the calculation of safety distances and stopping times as well as the detailed dimensioning of physical guards round out the specifications of the hardware design.