Baumusterprüfung und Struktur einer sicherheitsgerichteten speicherprogrammierbaren Steuerung

Abstract

The report is divided into two parts. The first part describes the procedure adopted for obtaining a certificate of approval for safety-oriented programmable controllers. The second part explains the structure of a system of this type with reference to an example. In the Federal Republic of Germany, a certificate of aproval is based on the DIN/VDI/VDE regulatory specifications and on the state of the art, as manifested in the technical literature and existing certified systems. The programmable logic controller to be certificated undergoes a safety analysis to establish the basic capability of the structure and reveal technical and organizational measures necessary for achieving the required safety level. Proof of the effectiveness of the safety measures applied is provided by appropiate tests for failure. After an overview of the various possible safety structures, an outline is given of the SIMATICS S5-115F programmable controller as an implementation example.