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Introduction

This Safety Manager architecture has a redundant Controller and redundantinput and output (IO) modules (OR function outputs) (see Figure 17 and Figure18 below).The IO modules are controlled via the IO bus drivers (located in the QPP) andthe IO Bus, which can control up to 8 IO chassis per cabinet. Each IO chassis iscontrolled via the IO Extender. The processor and IO are fully redundant, whichallows continuous operation and smooth (zero-delay) transfer of the control incase of a Control Processor or IO failure.This architecture can be applied up to and including SIL3.Interaction between Control ProcessorsBoth Control Processors run in parallel, meaning that they simultaneously readinput states and write output states. Via the redundant link both ControlProcessor’s continuously inform each other about the achieved IO states,application states. The redundant link is used to synchronize activities andcompare results. 

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