Depot Protection Systems are installed in train maintenance facilities to control the safe movement of rail vehicles, protecting staff working in the vicinity. An analysis of the obligations of the safety functions performed by a Depot Protection System in a maintenance facility has concluded that a SIL 2 target level is required.
A system can only be deemed as a SIL compliant system is assessed as a whole, rather than relying on compliant COTS (commercial off-the- shelf) components in a system using software of unknown pedigree (SOUP). Zonegreen’s DPPSTM has been assessed to meet the hardware and software requirements of SIL 2. DPPSTM uses standardized software and hardware across all installations, resulting in all DPPSTM installations meeting SIL2.
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