SIGNAL+DRAHT | Issue 11/2022
A SIL4 certified signalling solution with flexible COTS
The interlocking system in Helsinki metro and its western extension (2017) has been implemented using a commercial off-the-shelf (COTS) platform. The SIL4 HIMax based Mipro TCS-O interlocking has been controlling and supervising hundreds of trackside signalling elements and auxiliary safety-critical components, such as rolling fire doors, for five years now with excellent availability and safety. New functions and elements have been added to the system over the years. T he system structure enabled a straightforward development and expansion of the existing system...