SIGNAL+DRAHT | Ausgabe 09/2022

The independent safety assessment and certification of PLC for railway applications

September 2022 | Dominik Strixner, Hendrik Schäbe

Programmable logic controllers (PLC) are increasingly being used in railway applications. Typically, these PLC have already been certified by an independent safety assessor (ISA) as a “generic product” for industrial applications according to IEC 61508 [8] and require a further additional ISA assessment with optional certification according to EN 50126-1/-2 [9], EN 50128 / EN 50657 [10, 11] and EN 50129 [12] for railway applications. The use of a PLC that has already been certified as a “generic product” according to IEC 61508 [8] has the advantage that an existing and proven industrial product can be used instead of developing a PLC that uses a complex and expensive approach....

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