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Introduction

This Safety Manager architecture has a redundant Controller and redundant input and output (IO) modules (OR function outputs) (see Figure 17 and Figure 18 below). The IO modules are controlled via the IO bus drivers (located in the QPP) and the IO Bus, which can control up to 8 IO chassis per cabinet. Each IO chassis is controlled via the IO Extender. The processor and IO are fully redundant, which allows continuous operation and smooth (zero-delay) transfer of the control in case of a Control Processor or IO failure. This architecture can be applied up to and including SIL3. Interaction between Control Processors Both Control Processors run in parallel, meaning that they simultaneously read input states and write output states. Via the redundant link both Control Processor’s continuously inform each other about the achieved IO states, application states. The redundant link is used to synchronize activities and compare results. 

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